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The Development History of Four-Point Contact Slewing Bearings

April 20, 2025/in Bearing Knowledge /by wang

The development history of four-point contact slewing bearings is a history of continuous innovation and breakthroughs. It has always kept pace with the development of science and technology and continuously met the growing demands of various industries for mechanical components.

What is Four-Point Contact Slewing Bearing?

The four-point contact slewing bearing is a mechanical component composed of an inner ring, an outer ring, rolling elements, etc. The rolling elements have four-point contact with the raceways of the inner and outer rings, enabling the bearing to withstand axial forces, radial forces, and overturning moments simultaneously. It features a compact structure, high rotational accuracy, and large load-carrying capacity. It is widely used in fields such as construction machinery, wind power, and robotics, and can realize the smooth rotational movement of components. It is an indispensable key component in many large-scale mechanical equipment.

The Impetus of the Industrial Revolution: The Germination of Modern Slewing Bearings

It was the Industrial Revolution in the 18th century that truly promoted the development of slewing bearings. The widespread application of industrial manufacturing and mechanical devices put forward higher requirements for bearing technology. In 1776, the gyroscopic disc-shaped rolling bearing invented by the Scottish engineer John Sgriam was regarded as the prototype of modern slewing bearings. In the early 19th century, the British engineer Robert Jenner further improved the design and invented a metal bearing, making the slewing movement more stable and reliable and promoting the widespread application of slewing bearings in industrial machinery and railway transportation.

The Key Breakthrough in the Early 20th Century: The Birth of Four-Point Contact Slewing Bearings

The early 20th century was an important stage in the development of four-point contact slewing bearings. In 1912, the spherical ball device invented by the British engineer Joseph Thomson laid the foundation for the design of four-point contact slewing bearings. This design enables the bearing to withstand axial loads, radial loads, and tilting moments through the four-point contact between the steel balls and the bearing raceways, greatly expanding the application range of slewing bearings. Since then, four-point contact slewing bearings have continuously improved in design and manufacturing technology. The application of new materials and new technologies has significantly improved their load capacity, wear resistance, and service life.

The Leap in the Mid-20th Century: Material and Process Innovation

In the mid-20th century, with the rapid development of materials science and manufacturing processes, four-point contact slewing bearings迎来了新的突破. The application of new materials such as high-strength alloy steel and ceramic materials has significantly enhanced the performance of slewing bearings. High-strength alloy steel improves the load-carrying capacity and wear resistance of slewing bearings, while ceramic materials endow them with the characteristics of high temperature resistance, corrosion resistance, and low friction, enabling them to operate stably under harsher working conditions. At the same time, the improvement of manufacturing processes, such as the development of precision machining technology and heat treatment technology, has further improved the accuracy and reliability of slewing bearings.

During this period, four-point contact slewing bearings were widely used in fields such as construction machinery, construction machinery, metallurgical machinery, and ship machinery. In construction machinery, such as excavators and cranes, four-point contact slewing bearings enable the working devices to rotate flexibly and efficiently complete various operation tasks; in construction machinery, the slewing mechanism of tower cranes relies on four-point contact slewing bearings to achieve the precise lifting of heavy objects; in metallurgical machinery, the slewing bearings used in equipment such as converters and continuous casters need to withstand huge loads and harsh working environments, and four-point contact slewing bearings ensure the stable operation of the equipment with their excellent performance; in ship machinery, four-point contact slewing bearings provide reliable slewing support for equipment such as ship rudders and cranes.

Modern Innovation and Development: Technology-Driven and Application Expansion

With the continuous progress of science and technology, four-point contact slewing bearings have been continuously innovating in design and manufacturing. The application of technologies such as computer-aided design (CAD) and computer-aided engineering (CAE) enables engineers to design and analyze the structure and performance of slewing bearings more accurately, optimize design schemes, and improve product quality. At the same time, advanced manufacturing equipment and processes, such as numerical control machine tool processing and automated production lines, ensure the high-precision manufacturing and stable production of slewing bearings.

In the application field, four-point contact slewing bearings are constantly expanding new markets. In the wind power generation field, with the growing global demand for clean energy, the installed capacity and single-unit power of wind turbines are constantly increasing, putting forward higher requirements for the load-carrying capacity, reliability, and service life of slewing bearings. Four-point contact slewing bearings have become key components of the yaw and pitch systems of wind turbines with their good performance. In the industrial robot field, with the rapid development of intelligent manufacturing, industrial robots are being used more and more widely. Four-point contact slewing bearings provide high-precision and high-reliability slewing support for the joints of industrial robots, enabling robots to achieve more flexible and precise movements.

The Price of Four-Point Contact Slewing Bearings

There are many factors affecting the price of slewing bearings. Firstly, raw materials. High-quality steel has a high cost, and products made from it have excellent performance and a long service life, so the price is also high. Secondly, slewing bearings with complex manufacturing processes and high precision requirements require advanced equipment and strict quality control, so the price will also increase accordingly. Moreover, the larger and more special the size and specifications are, the greater the processing difficulty and material consumption, and the higher the price.

Suppliers of Four-Point Contact Slewing Bearings

In the field of slewing bearings, ldb bearing company shines globally with its excellent quality and innovation capabilities. With its profound heritage and unremitting efforts, the products of ldb bearing company cover a wide range. Whether they are standard or non-standard slewing bearings, they can be manufactured with high quality to meet the diverse needs of different customers. Advanced production and testing equipment are the cornerstone of high-quality products. ldb bearing company is well aware of this and is equipped with nearly 30 sets of various types of equipment. The company has an experienced design and technical team. With their profound professional knowledge and innovative spirit, they continuously optimize product designs and overcome technical problems.

The Influence of Different Radii on the Performance of Slewing Bearings

April 20, 2025/in Bearing Knowledge /by wang

Slewing bearings play a crucial role in numerous mechanical fields. Changes in the radius of a slewing bearing can significantly affect its performance. In different industrial scenarios, the rational selection of the slewing bearing radius is of great importance for the efficient operation, safety, and stability of equipment.

What are Slewing Bearings with Different Radii?

The radius of a slewing bearing has multiple impacts on its performance. In practical applications, factors such as the specific working conditions of the equipment, load-carrying requirements, accuracy requirements, and cost budget need to be comprehensively considered to select a suitable slewing bearing radius. With the continuous progress of science and technology, in the future design and manufacturing of slewing bearings, more attention will be paid to optimizing the matching between the radius and other parameters to further improve the performance of slewing bearings and meet the growing demands of different fields.

Load-Carrying Capacity of Slewing Bearings with Different Radii

The radius of a slewing bearing is closely related to its load-carrying capacity. From the perspective of mechanical principles, slewing bearings with a larger radius have advantages in withstanding axial forces, radial forces, and overturning moments. Take a large crane as an example. Its slewing bearing needs to bear the huge gravity of the boom and the heavy object (generating an axial force), the swing during the hoisting process (generating a radial force), and the overturning moment caused by the eccentricity of the heavy object. When the radius of the slewing bearing increases, the contact area between the raceway and the rolling elements also increases. According to the pressure formula P=\frac{F}{S} (where P is pressure, F is force, and S is the stressed area), under the same load, the increase in the contact area reduces the pressure per unit area. This means that a slewing bearing with a larger radius can more effectively distribute the load without increasing the material strength, thereby improving the load-carrying capacity. Generally, under the same other conditions, if the radius of the slewing bearing is doubled, its load-carrying capacity may increase several times or even more. The specific increase depends on the structural design and material properties of the slewing bearing.

Rotational Accuracy of Slewing Bearings with Different Radii

Rotational accuracy is one of the important indicators for measuring the performance of a slewing bearing, and the radius also has a significant impact on it. When a slewing bearing with a smaller radius is in operation, due to the relatively large influence of the contact accuracy between the rolling elements and the raceway and manufacturing errors, it is prone to generating large rotational errors. However, for a slewing bearing with a larger radius, under the same manufacturing accuracy, the relative error will be reduced. For example, on the turntable of a precision optical instrument, if the radius of the slewing bearing is too small, even if the manufacturing accuracy of the rolling elements and the raceway is very high, small errors may still cause the turntable to shake significantly during rotation, affecting the measurement accuracy of the optical instrument. On the contrary, a slewing bearing with a larger radius can provide a more stable rotational motion, reducing shaking and eccentricity, thereby improving rotational accuracy. Usually, high-precision large slewing bearings, such as those used in astronomical telescopes, have a large radius, and the rotational accuracy can be controlled within a very small range, meeting the requirements of high-precision observations.

Stability of Slewing Bearings with Different Radii

The stability of a slewing bearing is crucial for the safe operation of equipment. Changes in the radius directly affect the stability of the slewing bearing. Slewing bearings with a larger radius usually have a lower center of gravity, which helps to improve the stability of the equipment during operation. Take a wind turbine as an example. Its slewing bearing has a large radius. Under the action of strong winds, the large radius enables the overturning moment generated by the wind to be more effectively dispersed and resisted, reducing the risk of the wind turbine toppling. In addition, slewing bearings with a larger radius also perform better in resisting external impacts and vibrations. When the equipment is disturbed by the outside world, a slewing bearing with a larger radius can, by virtue of its large inertia and structural strength, better maintain stable operation and reduce the possibility of vibration being transmitted to other components of the equipment. However, slewing bearings with a smaller radius, due to their higher center of gravity and relatively compact structure, are more likely to shake and become unstable when facing large external forces.

Friction Resistance of Slewing Bearings with Different Radii

The radius also has a certain impact on the friction resistance of a slewing bearing. During the operation of a slewing bearing, friction resistance is generated between the rolling elements and the raceway. Generally, for slewing bearings with a larger radius, the movement trajectory of the rolling elements is longer. Under the same load and lubrication conditions, the friction resistance will be relatively large. However, with the development of materials science and lubrication technology, the friction resistance can be effectively reduced by using materials with a low friction coefficient and efficient lubrication methods. For example, in the slewing bearings of some large port cranes, although the radius is large, the friction resistance is well controlled through the use of special anti-friction materials and advanced lubrication systems. At the same time, slewing bearings with a larger radius have an advantage in heat dissipation and can better dissipate the heat generated by friction, avoiding problems such as lubrication failure and increased component wear caused by excessive temperature.

Installation Space and Cost of Slewing Bearings with Different Radii

The selection of the slewing bearing radius also needs to consider installation space and cost factors. Slewing bearings with a larger radius usually require more installation space, which may be a limiting factor in some equipment with limited space. For example, in the joints of some small industrial robots, due to the narrow space, only slewing bearings with a smaller radius can be selected. In addition, slewing bearings with a larger radius have higher costs in terms of material usage and manufacturing processes. Manufacturing large slewing bearings requires larger specifications of raw materials and is more difficult to process, thus increasing the manufacturing cost. Therefore, when selecting the slewing bearing radius, factors such as the actual needs of the equipment, installation space, and cost budget need to be comprehensively considered.

Price of Slewing Bearings with Different Radii

The prices of slewing bearings with different radii are affected by multiple factors. In terms of radius size, large-radius slewing bearings are more expensive due to more material usage and difficult processing. Regarding materials, the costs of high-quality alloy steel, stainless steel, etc. vary, which affects the price. The accuracy grade is crucial. High-precision slewing bearings require advanced equipment and strict quality control, and the high cost leads to a high price. Different load-carrying capacities mean that thick plates and large balls are used to meet high-load requirements, which will increase the price. Surface treatments such as chrome plating and other processes increase costs and also cause price differences.

Supplier of Slewing Bearings with Different Radii

Since its establishment, ldb bearing Company has always shone with a unique luster. It is rooted in Luoyang, Henan Province, a fertile ground for the bearing industry. With its professional design and R & D capabilities, it has created many products of excellent quality. The company’s product specifications are rich and diverse. Whether they are standard products or non-standard products, they all demonstrate exquisite craftsmanship. From the entry of raw materials into the factory to the output of finished products, strict process control and quality management are implemented at every step.

Advantages and Disadvantages of Ceramic Slewing Bearings

April 20, 2025/in Bearing Knowledge /by wang

In the realm of modern mechanical engineering, slewing bearings are pivotal for the stable operation and performance of equipment. Ceramic slewing bearings, owing to their distinctive material properties, demonstrate certain performance advantages, yet they also have some limitations.

What is Ceramic Slew Bearing?

Ceramic slewing bearings possess remarkable advantages in terms of low mass, high hardness, chemical stability, and high – temperature resistance. These properties hold the potential to enhance the performance of equipment in specific fields. However, drawbacks such as high brittleness, great processing difficulty, and a high elastic modulus restrict their widespread application. With the continuous progress of materials science and processing technology, it is hoped that these shortcomings can be overcome through technological innovation in the future, thereby further expanding the application scope of ceramic slewing bearings.

Advantages of Ceramic Slew Bearing

High Hardness and Wear Resistance,ceramics exhibit extremely high hardness. For example, the hardness of silicon nitride ceramics can reach 2000 – 3000 HV, far exceeding that of ordinary metal materials. This enables minimal wear when used in slewing bearings, even under frequent friction. In production equipment within industries with stringent hygiene requirements, such as food and pharmaceuticals, the high wear resistance of ceramic slewing bearings can minimize the generation of wear particles, preventing product contamination and ensuring product quality and safety. In the rotating parts of textile machinery, the wear – resistant nature of ceramic slewing bearings can decrease equipment maintenance frequency, improve production efficiency, and reduce production costs.

Low Mass ,the density of ceramic materials is significantly lower than that of metals. For example, the density of silicon carbide ceramics is approximately one – third that of steel. In weight – sensitive sectors like aerospace and drones, the adoption of ceramic slewing bearings can substantially reduce the overall weight of the equipment. Take the rotatable components on satellites as an instance. Using ceramic slewing bearings can cut down on fuel consumption, increase the satellite’s payload, and extend its service life. When applied in the gimbal rotation mechanisms of drones, ceramic slewing bearings can enhance flight flexibility and endurance, lower energy costs, and boost economic efficiency.

Good Chemical Stability,ceramic materials feature stable chemical properties and perform outstandingly in corrosive environments like those with acids and alkalis. In fields such as chemical production and offshore engineering, where equipment often comes into contact with corrosive media, ceramic slewing bearings are not as easily corroded as metals. In large – scale rotating feeding equipment for marine aquaculture, ceramic slewing bearings can resist seawater erosion, ensuring the long – term stable operation of the equipment. This reduces the frequency of equipment repair and replacement, safeguarding the continuity of aquaculture operations. In the stirring devices of chemical reaction kettles, using ceramic slewing bearings can prevent equipment failures caused by corrosion, enhancing the safety and stability of chemical production.

Excellent High – Temperature Resistance,Ceramics have prominent high – temperature resistance. Some ceramics, like alumina ceramics, can endure temperatures as high as 1600°C. In high – temperature industrial fields such as metallurgy and glass manufacturing, ceramic slewing bearings can operate normally in harsh high – temperature conditions. In the rotary discharge mechanisms of glass furnaces, ceramic slewing bearings can function stably in the environment of radiant and convective heat from high – temperature glass liquid, ensuring smooth discharge and improving production efficiency. In the tilting mechanisms of metal smelting furnaces, ceramic slewing bearings can withstand the thermal shock of high – temperature molten metal, extending the equipment’s service life and reducing safety risks during the production process.

Disadvantages of Ceramic Slew Bearing

High Brittleness,the brittleness of ceramic materials is one of their major drawbacks. They are prone to cracking when subjected to impact or vibration. In equipment with frequent vibrations and impacts, such as mining machinery and construction equipment, the application of ceramic slewing bearings is limited. For example, the slewing platform of an excavator bears substantial impact forces during operation. If a ceramic slewing bearing is used, it is highly likely to crack and be damaged, affecting the normal operation of the equipment and even potentially causing safety accidents. In the rotating parts of crushers, ceramic slewing bearings struggle to withstand the intense impacts generated during material crushing and cannot meet the actual working requirements.

Great Processing Difficulty,The high hardness and brittleness of ceramic materials make their processing extremely challenging. The processing process necessitates special equipment and techniques, such as grinding with high – precision diamond grinding wheels and laser processing. Moreover, the processing efficiency is low, and the cost is high. Controlling the processing accuracy when manufacturing high – precision ceramic slewing bearing raceways is difficult, resulting in a relatively high rejection rate. This keeps the production cost of ceramic slewing bearings high, restricting their large – scale application. They are only applicable in high – end fields with extremely high – performance requirements and where cost is less of a concern.

High Elastic Modulus,ceramics have a relatively high elastic modulus, meaning they deform minimally under force. Although this can be an advantage in some cases, it becomes a disadvantage in scenarios where buffering and shock absorption are required. In the slewing bearings of precision instruments, the minor vibrations generated during equipment operation are difficult to buffer through the deformation of the ceramic slewing bearings themselves. These vibrations may be transmitted to other components of the instrument, affecting its measurement accuracy. In the steering mechanisms of automotive suspension systems, if ceramic slewing bearings are used, the bumps and vibrations during vehicle travel cannot be effectively buffered. This reduces the ride comfort and may also have an adverse impact on the vehicle’s handling stability.

Price of Ceramic Slew Bearings

The prices of Ceramic Slew Bearings are influenced by multiple factors. Regarding materials, ceramic materials such as silicon nitride and zirconia have high costs, and their preparation processes are intricate. In processing, due to their high hardness and brittleness, high – precision specialized equipment and advanced technologies are needed. This leads to low production efficiency and increased costs. The accuracy grade is also crucial, as high – precision bearings are much more expensive than those of ordinary precision. In terms of brands, well – known brands command higher prices due to their quality and R & D investment. Additionally, market supply and demand relationships can cause price fluctuations.

Supplier of Ceramic Slew Bearings

Since its establishment in Luoyang, Henan Province, Ldb bearing Company has embarked on an extraordinary journey in the bearing industry. Over the years, by focusing on high – precision slewing bearings and slewing drive products, it has been able to precisely produce both standard and non – standard products. Thanks to their excellent quality, these products have become benchmarks of quality and strength within the industry.

Features of Metal Slewing Bearings

April 19, 2025/in Bearing Knowledge /by wang

Metal slewing bearings are extensively applied in numerous industrial sectors and serve as crucial components for enabling smooth rotational motion of equipment parts. They possess distinctive structural and performance characteristics, with both prominent advantages and disadvantages.

What is Metal Slewing Bearing?

Metal slewing bearings play an irreplaceable role in various industrial fields, owing to their high load – bearing capacity, high – precision rotation capabilities, reliable stability, and long service life. However, their drawbacks, such as high costs, large weight, and complex installation and maintenance procedures, limit their application in certain scenarios. With the continuous advancement of technology, it is anticipated that in the future, metal slewing bearings will overcome these limitations while maintaining their advantages through means like material innovation and process improvement, thereby achieving broader applications.

Advantages of metal slew bearing

High Load – Bearing Capacity,The structural design of metal slewing bearings allows them to endure diverse types of loads, including axial forces, radial forces, and overturning moments. Take large – scale cranes as an example. When hoisting heavy objects, the slewing bearing has to bear the axial force generated by the combined weight of the boom and the load, the radial force resulting from sway during the hoisting process, and the overturning moment caused by the load’s eccentricity. The raceways and rolling elements of the slewing bearing are crafted from high – strength metal materials and undergo specialized processing techniques, such as surface quenching. This enhances the material’s hardness and wear resistance, ensuring that the slewing bearing can operate stably even under complex stress conditions, boasting a formidable load – bearing capacity. Small – sized metal slewing bearings can have an axial load – bearing capacity of up to several tens of kilonewtons, while large – scale ones can withstand thousands of kilonewtons or even higher axial forces. The slewing bearings of some large – scale port cranes can have an overturning moment – bearing capacity exceeding tens of thousands of newton – meters.

High – Precision Rotation,in precision equipment, the high – precision rotation feature of metal slewing bearings is of utmost importance. For instance, in semiconductor manufacturing equipment, an extremely high level of positioning accuracy for components is required. The manufacturing process of slewing bearings is continuously optimized. The processing accuracy of the raceways can reach the micron level, and the dimensional accuracy and roundness of the rolling elements are strictly controlled. Additionally, the internal structure of the slewing bearing is rationally designed to effectively minimize axial and radial run – out during operation, guaranteeing high – precision positioning of equipment components during rotation. Generally, the rotational accuracy of metal slewing bearings can be maintained within ±5 arc – minutes, and that of high – precision ones can even be controlled within approximately ±1 arc – minute, meeting the high – precision demands of precision equipment.

Reliable Stability,the stability of metal slewing bearings stems from their robust metal structure and excellent sealing design. In harsh industrial environments, such as those with high temperatures, high humidity, or heavy dust, the metal housing of the slewing bearing can effectively resist external impacts and corrosion. The internal sealing device prevents impurities like dust and moisture from infiltrating, protecting the raceways and rolling elements from erosion and ensuring their normal operation. For example, in the large – scale rotary kiln equipment of cement plants, metal slewing bearings can operate stably even when exposed to a dusty environment for an extended period. This reduces equipment malfunctions and boosts production efficiency.

Reliable Stability,the metal materials chosen for metal slewing bearings exhibit good wear resistance and fatigue resistance. Under normal usage and maintenance conditions, they have a relatively long service life. In wind turbines, although the slewing bearings are exposed to complex outdoor weather conditions over an extended period, through rational material selection, regular lubrication, and maintenance, their service life can reach 20 years or even longer. This not only reduces the equipment’s maintenance costs but also extends the overall service cycle of the equipment, minimizing the impact of frequent component replacements on production.

Disadvantages of metal slew bearing

High Costs,the high costs of metal slewing bearings are mainly attributed to materials and processing. To ensure high load – bearing capacity and a long service life, high – quality alloy steels, such as those containing alloying elements like chromium and molybdenum, are typically selected. These materials are expensive. During the processing stage, the high – precision requirements render the processing technology complex. Advanced processing equipment and testing instruments, such as high – precision grinders and coordinate measuring machines, are necessary, driving up the production costs. The price of small – sized metal slewing bearings can range from several thousand yuan, while that of large – scale, high – precision slewing bearings can reach hundreds of thousands of yuan or even higher. This undoubtedly increases the overall manufacturing costs of the equipment.

Large Weight,since metal slewing bearings are predominantly composed of metal materials, they are relatively heavy. In some application scenarios with strict weight constraints, such as the aerospace industry, an overly heavy slewing bearing will increase the overall weight of the aircraft, affecting its flight performance and energy consumption. Even in ground – based equipment, such as small – scale construction machinery that requires frequent movement, an excessively heavy slewing bearing will increase the difficulty of equipment movement and energy consumption, reducing the equipment’s mobility and operational efficiency.

Complex Installation and Maintenance,The installation of metal slewing bearings demands professional skills and equipment, with high – precision installation requirements. During installation, parameters such as the levelness and concentricity of the slewing bearing must meet the specified standards; otherwise, it will affect its normal operation and service life. When installing giant slewing bearings in large – scale bridge construction, large – scale lifting equipment and high – precision measuring instruments are needed. The installation process is complex and time – consuming. Routine maintenance is also rather cumbersome. It is necessary to regularly inspect the lubrication condition and wear level of the slewing bearing, and promptly replenish lubricants and replace worn – out components. The maintenance of some large – scale slewing bearings requires the operation of professional technicians, increasing the maintenance costs and difficulties.

Prices of Metal Slewing Bearings

The prices of metal slewing bearings vary significantly due to multiple factors. Small, ordinary ones may cost a few hundred yuan, such as those used in small – scale machinery with low – precision requirements. Medium – sized ones usually cost around several thousand yuan and are suitable for general industrial equipment. Large – scale, high – precision, or those made of special materials and with unique manufacturing processes can cost tens of thousands of yuan or even more. For example, slewing bearings used in high – end equipment like wind power and offshore engineering. The specific price needs to be determined by comprehensively considering factors such as materials, dimensions, and precision.

Suppliers of Metal Slewing Bearings

Since its establishment, Ldb bearing Company has always stood out with its unique excellence. Rooted in Luoyang, Henan Province, a thriving hub for the bearing industry, the company has leveraged its professional design and R&D capabilities to produce numerous high – quality products. The company offers a wide range of product specifications. Whether they are standard or non – standard products, they all showcase exquisite craftsmanship. From the procurement of raw materials to the production of finished products, strict process control and quality management are implemented at every step.

Effects of Low Temperature on Slewing Bearings

April 19, 2025/in Bearing Knowledge /by wang

The effects of low temperature on slewing bearings involve multiple aspects. These effects can seriously threaten the normal operation of equipment. By choosing appropriate solutions, the performance and reliability of slewing bearings in low – temperature environments can be effectively improved.

What is Low – Temperature Slew Bearing?

As a key component for various mechanical equipments to achieve rotational motion between components, slewing bearings are widely used in equipment such as cranes, wind turbines, and tunnel boring machines. In low – temperature environments, the performance and reliability of slewing bearings face many challenges. In – depth understanding of these effects and taking effective solutions are crucial for ensuring the normal operation of equipment and extending its service life.

Effects of Low Temperature on Slewing Bearings

Changes in Material Properties

Low temperature can alter the properties of the metal materials used in slewing bearings. Most metal materials become brittle at low temperatures, with a significant reduction in impact toughness. Taking commonly used bearing steel as an example, in a low – temperature environment, the crystal structure inside the material changes, making it difficult for dislocations to move. This greatly reduces the material’s ability to resist impact loads. When the equipment starts at low temperatures or is impacted during operation, the raceways, rolling elements, and other components of the slewing bearing are more prone to cracks. In severe cases, fractures may even occur, greatly affecting the load – bearing capacity and service life of the slewing bearing.

Decrease in Lubrication Performance

Low temperature seriously affects the lubrication effect of slewing bearings. Lubricating oil increases in viscosity and becomes less fluid at low temperatures, making it difficult to form a good oil film between the raceways and rolling elements. This not only increases the frictional resistance, resulting in increased energy consumption during equipment operation, but also exacerbates the wear between components. Under extremely low – temperature conditions, the lubricating oil may even solidify, completely losing its lubricating function. This causes the wear of the slewing bearing to rise sharply, affecting the rotational accuracy of the equipment and leading to unstable equipment operation, which cannot meet the working requirements.

Deterioration of Sealing Performance

The sealing device of slewing bearings is also affected by low temperatures. Sealing materials usually have a certain elasticity to ensure good sealing performance. However, in a low – temperature environment, the sealing materials harden, become brittle, and their elasticity decreases, resulting in reduced sealing performance. External impurities such as moisture and dust can easily penetrate into the interior of the slewing bearing, contaminating the lubricating oil and accelerating the corrosion and wear of components. If the moisture freezes after entering, it may also damage the sealing structure, further deteriorating the working environment of the slewing bearing.

Changes in Fitting Accuracy Caused by Thermal Expansion and Contraction

Each component of the slewing bearing undergoes dimensional changes due to thermal expansion and contraction at low temperatures. Different materials have different thermal expansion coefficients, which may affect the fitting accuracy between components. For example, the clearance between the raceway and the rolling elements may become smaller, increasing friction and wear. If the clearance is too large, it will affect the rotational accuracy, causing vibration and noise during equipment operation. In addition, thermal expansion and contraction may also cause the connections between the slewing bearing and other equipment components to loosen, affecting the overall stability of the equipment.

Solutions to Cope with the Effects of Low Temperature

Selection of Appropriate Materials

To cope with the low – temperature environment, materials with good low – temperature performance should be selected for manufacturing slewing bearings. For raceways and rolling elements, alloy steels containing elements such as nickel and manganese can be used. These alloying elements can effectively improve the low – temperature toughness of the material and reduce the brittle transition temperature of the material. For slewing bearings used in some extremely cold regions, special low – temperature alloy materials such as nickel – based alloys can also be considered. These materials can still maintain good mechanical properties at low temperatures. For seals, low – temperature – resistant rubber or plastic materials such as fluororubber and silicone rubber should be selected. These materials can maintain good elasticity and sealing performance at low temperatures.

Optimization of the Lubrication System

In response to the problem of reduced lubrication performance at low temperatures, the lubrication system of the slewing bearing needs to be optimized. First, lubricating oil with excellent low – temperature performance should be selected. It has a low pour point and a high viscosity index and can still maintain good fluidity at low temperatures. For example, polyalphaolefin (PAO) lubricating oil in synthetic lubricating oils performs better than mineral lubricating oils in low – temperature environments. Second, heating or heat – preservation devices can be used to increase the temperature of the lubricating oil to ensure its normal flow at low temperatures. In some large – scale equipment, a lubricating oil heating system can be installed to preheat the lubricating oil before the equipment starts. For small – scale equipment, heat – preservation materials can be used to wrap the lubricated parts to reduce heat loss.

Improvement of the Sealing Structure

To improve the sealing performance of slewing bearings at low temperatures, the sealing structure can be improved. A multi – layer sealing design can be adopted to increase the reliability of the seal. For example, multiple sealing lips can be set between the inner and outer rings of the slewing bearing, and sealant can be filled between the sealing lips to prevent the intrusion of external impurities. In addition, the seals should be regularly inspected and replaced to ensure their good performance. In a low – temperature environment, the aging rate of seals accelerates, so more attention needs to be paid to the maintenance of seals.

Compensation for the Effects of Thermal Expansion and Contraction

To compensate for the impact of thermal expansion and contraction on the fitting accuracy of slewing bearings, the thermal expansion coefficients of materials should be fully considered in the design stage, and the fitting clearances between components should be reasonably designed. Methods such as reserving clearances or adjusting shims can be used to ensure the normal fitting between components in a low – temperature environment. During the equipment installation and commissioning process, the fitting clearance of the slewing bearing should be adjusted according to the actual ambient temperature. The fitting accuracy of the slewing bearing can also be regularly detected to timely discover and solve problems caused by thermal expansion and contraction.

Price of Low – Temperature Slew Bearings

The prices of Low – Temperature Slew Bearings are affected by multiple factors. Material is one of the important factors. Special steels that can maintain their performance in low – temperature environments are required, and the high cost leads to an increase in price. The manufacturing process is also crucial. High – precision processing technology and strict quality control ensure the stability and reliability of the bearings at low temperatures, which increases the production cost and leads to a relatively high price. In terms of specifications and dimensions, special – specification or large – size Low – Temperature Slew Bearings are difficult to produce, and their prices will also increase accordingly.

Supplier of Low – Temperature Slew Bearings

Since its establishment, Ldb bearing Company has always shone with a unique luster. Rooted in Luoyang, Henan Province, a fertile ground for the bearing industry, the company has created many high – quality products with its professional design and R & D capabilities. The company’s product specifications are rich and diverse. Whether they are standard products or non – standard products, they all demonstrate exquisite craftsmanship. From the entry of raw materials into the factory to the output of finished products, strict process control and quality management are implemented at every step.

What kind of Slew bearings can withstand high temperature?

April 18, 2025/in Bearing Knowledge /by wang

In the field of modern industry, numerous production processes involve high-temperature environments. In the high-temperature scenarios, ordinary bearings struggle to function properly. Thus, bearings capable of withstanding high temperatures have emerged. These bearings enable equipment to operate stably in high-temperature environments.

What are High-Temperature Slew Bearings?

The primary characteristic of High-Temperature Slew Bearings is their excellent high-temperature resistance. They can maintain structural stability and mechanical properties for extended periods in high-temperature environments. Their materials are usually special alloys, such as alloy steels containing elements like chromium, molybdenum, and vanadium. These alloys can form a dense oxide film at high temperatures, preventing further oxidation and maintaining material strength. For example, at a high temperature of 1000°C, some nickel-based alloy bearing materials can still maintain high hardness and strength, meeting the operational requirements of equipment.

High-Temperature Slew Bearings also require a reliable lubrication system. Ordinary lubricating greases are prone to evaporation and carbonization at high temperatures and cannot provide lubrication. High-Temperature Slew Bearings often use high-temperature-resistant solid lubricants, such as molybdenum disulfide and graphite. These can form a lubricating film at high temperatures, reducing the coefficient of friction. Some High-Temperature Slew Bearings are also equipped with a forced lubrication system, which uses circulating and cooled lubricating oil to dissipate heat and ensure lubrication effectiveness.

Main Types and Characteristics

Ceramic Bearings

Ceramic bearings are outstanding among High-Temperature Slew Bearings. Commonly used ceramic materials include silicon nitride and silicon carbide. These ceramic materials have a low density, approximately one-third that of metals, which can effectively reduce the weight of equipment. They have extremely high hardness, with the hardness of silicon nitride ceramics reaching 2000 – 3000 HV, much higher than that of metals, and excellent wear resistance. In high-temperature environments, ceramic bearings have good chemical stability, are not prone to reacting with other substances, and have strong oxidation resistance. For example, in the high-temperature furnace equipment of the glass manufacturing industry, ceramic bearings can operate stably at around 1500°C, reducing maintenance costs and improving production efficiency. However, ceramic bearings are relatively brittle, prone to damage in impact environments, and have high processing difficulty and costs.

High-Temperature Alloy Bearings

High-temperature alloy bearings use nickel-based and cobalt-based alloys as their main materials. These alloys contain multiple alloying elements such as chromium, molybdenum, and tungsten. They have good oxidation resistance and thermal strength at high temperatures and can withstand high temperatures and heavy loads. Nickel-based alloy bearings can operate normally at 800 – 1000°C and are commonly used in critical components such as aircraft engines and gas turbines. High-temperature alloy bearings have good strength and toughness and can adapt to complex working conditions. However, the alloy composition is complex, resulting in high manufacturing costs.

Self-Lubricating Bearings

Self-lubricating bearings achieve self-lubrication by adding solid lubricants to the metal matrix. Commonly used solid lubricants include molybdenum disulfide and polytetrafluoroethylene. In high-temperature environments, the solid lubricant in this type of bearing can slowly release and form a lubricating film on the friction surface, reducing friction and wear. In the continuous casting equipment of the metallurgical industry, self-lubricating bearings can operate stably in high-temperature, high-load, and difficult-to-lubricate environments, reducing maintenance frequency and improving equipment operation reliability. However, the self-lubricating performance of self-lubricating bearings weakens over time, and lubricants need to be replaced or replenished regularly.

Application Fields

In the aerospace field, parts such as engine combustion chambers and turbines are exposed to extremely high temperatures. The performance of High-Temperature Slew Bearings directly affects the safety and performance of aircraft. For example, High-Temperature Slew Bearings in aircraft engines need to operate at temperatures above 1200°C, withstanding high speeds and heavy loads. Ceramic bearings and high-temperature alloy bearings meet these requirements with their excellent performance, ensuring the stable operation of engines.

In the metallurgical industry, High-Temperature Slew Bearings are widely used in various heating furnaces, rolling mills, and other equipment. During the steel rolling process, the roll bearings need to withstand huge pressure and friction at 500 – 800°C. High-temperature alloy bearings and self-lubricating bearings can adapt to such harsh working conditions, ensuring the continuity of steel rolling production and product quality.

Equipment such as furnaces and annealing furnaces in the glass manufacturing industry also rely on High-Temperature Slew Bearings. In the stirrers and discharge devices of glass furnaces, ceramic bearings can operate stably near high-temperature glass melts at 1400 – 1600°C, preventing metal impurities from contaminating the glass and improving the quality and production efficiency of glass products.

With the continuous development of industrial technology, High-Temperature Slew Bearings also have new application requirements in emerging fields such as new energy and electronic manufacturing. In the concentrator tracking devices of solar thermal power generation systems, High-Temperature Slew Bearings need to operate for long periods in high-temperature and harsh outdoor environments. In high-temperature process equipment for semiconductor manufacturing, High-Temperature Slew Bearings must meet the requirements of high precision and low pollution.

High-Temperature Slew Bearings are indispensable in modern industry. Different types of High-Temperature Slew Bearings have their respective advantages and disadvantages. In practical applications, the appropriate bearing type needs to be selected according to specific working conditions and requirements. With the continuous progress of materials science, manufacturing processes, and lubrication technologies, the performance of High-Temperature Slew Bearings will continue to improve, and their application fields will be further expanded, providing more reliable support for industrial production in high-temperature environments.

Price of High-Temperature Slew Bearings

The price of High-Temperature Slew Bearings are affected by multiple factors. The material is a key factor. High-performance, high-temperature-resistant special alloy materials have high costs, resulting in high prices. In terms of accuracy levels, high-precision High-Temperature Slew Bearings have complex manufacturing processes and are more expensive than ordinary-precision ones. Regarding specifications and dimensions, large-sized or special-specification High-Temperature Slew Bearings are difficult to produce, and their prices will increase accordingly. Market supply and demand relationships also affect prices. When supply is in short supply, prices rise, and when there is an oversupply, prices fall.

Supplier of High-Temperature Slew Bearings

Ldb bearing company has always stood out since its establishment. It is rooted in Luoyang, Henan, a fertile ground for the bearing industry. With its professional design and R&D capabilities, it has created numerous high-quality products. The company offers a wide range of product specifications, and both standard and non-standard products showcase exquisite craftsmanship. From the incoming inspection of raw materials to the output of finished products, strict process control and quality management are implemented at every step.

The Application and Development of Slew bearings in Agricultural Machinery

April 4, 2025/in Bearing Knowledge /by wang

The slewing support is a crucial component of mechanical machinery. It can withstand multiple forces and enable slewing motion. It is widely used in harvesters and tractors, which can improve agricultural production efficiency and quality, and promote the intelligent upgrading of agricultural machinery.

What is Slew bearing?

Slew bearing is an important mechanical component widely used in various large – scale mechanical devices. It is similar to a large – scale bearing structure, mainly composed of an inner ring, an outer ring, rolling elements, and a cage. The slew bearing can withstand axial forces, radial forces, and overturning moments simultaneously, enabling stable rotational motion of mechanical device components. For example, in a tower crane, the slew bearing allows the jib to rotate flexibly for lifting and transporting goods. In a wind turbine, it helps the nacelle to turn with the wind direction.

Applications of Slew bearings

The application of slew bearings in harvesters is particularly crucial. Take the combine harvester as an example. During the process of harvesting crops, its cutter head needs to be adjusted in angle and rotated frequently. The slew bearing is installed between the cutter head and the machine body. It bears the weight of the cutter head and provides stable support and precise rotation for its slewing. Thanks to the slew bearing, the cutter head can swing flexibly from side to side, accurately adapting to different terrains and crop growth conditions. When encountering irregular fields, the cutter head can quickly adjust its angle with the help of the slew bearing, ensuring the continuity and efficiency of the harvesting operation, and avoiding crop leakage due to untimely angle adjustment, thus greatly improving the harvesting efficiency and quality.

In addition, the slew bearing also plays an indispensable role in the threshing and cleaning system of harvesters. The threshing drum and the cleaning sieve need to perform rotational motion within a certain range to achieve effective threshing and precise cleaning of crops. The slew bearing provides a stable rotational foundation for these components, ensuring the smooth operation of the threshing and cleaning process. At the same time, it can also withstand the impact load generated by the uneven distribution of crop materials, extending the service life of the threshing and cleaning system and reducing maintenance costs.

As a general – purpose machine in agricultural production, the slew bearing also plays an important role in enabling the functions of tractors. When a tractor is working in the fields, the front – end farm tools such as plows and harrows need to be adjusted in angle and position according to different tillage requirements. The slew bearing is installed between the tractor and the farm tools, allowing the farm tools to rotate flexibly up, down, left, and right. During plowing operations, the driver can easily adjust the plowing angle and depth of the plow by operating the control device with the help of the slew bearing to adapt to different soil conditions and tillage depth requirements. This precise adjustment improves the quality of plowing, making the soil looser and more conducive to crop growth.

In the transportation operations of tractors, the slew bearing also facilitates the turning of trailers. When a tractor is towing a trailer on field paths or rural roads, the slew bearing allows the trailer to follow the tractor’s turning flexibly, improving the vehicle’s driving stability and maneuverability and reducing the risk of traffic accidents caused by inflexible turning.

The Promotional Role of Slew bearings in Agriculture

The application of slew bearings has promoted agricultural modernization in many aspects. In terms of production efficiency improvement, slew bearings make the operation actions of agricultural machinery more flexible and precise, greatly shortening the operation time. The rapid slewing and angle adjustment of the harvester’s cutter head can increase the harvesting speed, enabling crops to be harvested within the optimal harvest period and reducing food losses caused by untimely harvesting. The precise adjustment of tractor farm tools also improves tillage efficiency, accelerating the progress of field operations and providing strong support for large – scale agricultural production.

Slew bearings are also essential for improving the quality of agricultural production. They ensure the stability and accuracy of agricultural machinery during operation, reducing damage to crops caused by unstable mechanical movement. For example, during the threshing process of harvesters, the slew bearing ensures the smooth rotation of the threshing drum, avoiding excessive碾压 of grains and improving the quality of the grain. When the tractor is plowing, the precise control of the tillage depth and angle achieved through the slew bearing creates a better growth environment for crops, helping to increase crop yields and quality.

From the perspective of agricultural industry upgrading, the application of slew bearings has promoted the intelligent and automated development of agricultural machinery. With the continuous progress of science and technology, slew bearings are combined with sensors and control systems to achieve automated control of agricultural machinery operations. For example, on some high – end combine harvesters, by installing angle sensors and control systems, the slewing angle of the cutter head can be automatically adjusted according to the distribution of crops, realizing intelligent harvesting. Such intelligent agricultural machinery not only improves production efficiency but also reduces dependence on labor, promoting the transformation and upgrading of the agricultural industry towards modernization and intelligence.

However, the application of slew bearings in agricultural machinery also faces some challenges. The agricultural operation environment is complex, and dust, soil, moisture, etc. can easily corrode and wear slew bearings, affecting their service life and performance. At present, the protective designs of some slew bearings used in agricultural machinery are not perfect enough and need to be further improved. At the same time, with the rapid development of agricultural modernization, higher requirements are placed on the performance and reliability of slew bearings. Some existing slew bearing products still need to be continuously improved in terms of load – bearing capacity and accuracy retention.

To address these challenges, R & D and production enterprises of slew bearings need to increase their technological innovation efforts. On the one hand, develop more advanced materials and surface treatment processes to improve the corrosion – resistance and wear – resistance of slew bearings. For example, use new corrosion – resistant alloy materials or special coating technologies to extend the service life of slew bearings in harsh agricultural environments. On the other hand, strengthen the optimization of the structural design of slew bearings to improve their load – bearing capacity and accuracy retention, meeting the continuously upgraded performance requirements of agricultural machinery.

The Price of Slew bearings

The price of slew bearings is affected by multiple factors. The material is crucial. Using corrosion – resistant materials such as stainless steel and special alloys increases the cost and thus the price. High – precision processed slew bearings also have a higher price due to the strict requirements for processes and equipment. In addition, brand influence also plays a role. Well – known brand products have more guaranteed quality and after – sales service, and their prices are often on the high side. Market supply and demand relationships also matter. When the supply is in short supply, the price rises, and when the supply exceeds the demand, the price drops.

Supplier of Slew bearings

LDB Bearing Company is a shining star in the bearing industry! Since its establishment in 1999, with its unremitting efforts and innovative spirit, it has grown from obscurity to become well – known in the industry. The bearing products it produces are of excellent quality. For example, its spur – gear slewing drive has high precision and strong stability and is widely used in many fields, injecting strong impetus into industrial production. Moreover, the company has passed the ISO9001:2015 quality management system certification of TUV Germany, ensuring product quality with strict standards. With high – quality products and attentive services, it has won the trust of customers in 73 countries and regions around the world and is bound to create more glories in the future!

How to Prevent Rust from Damaging slew Bearings

April 4, 2025/in Bearing Knowledge /by wang

The performance and lifespan of bearings are crucial to the operation of equipment. Rust poses a threat to the reliability and lifespan of bearings. Rust can damage the lubricating film, intensify friction, and affect the rotational accuracy and stability.

What is a Slewing Bearing?

A slewing bearing is an essential device that enables mechanical components to achieve rotational motion. It is widely used in various types of mechanical equipment. It typically consists of a slewing support, a drive device, a sealing system, etc. The slewing support, as a fundamental part, can withstand axial forces, radial forces, and overturning moments, ensuring the stable rotation of the equipment. The drive device provides power for rotation. Commonly, a combination of a motor and a reducer is used, which drives the slewing support to rotate through methods such as gear transmission. For example, in a tower crane, the rotation of the jib during operation relies on the slewing bearing. In the field of industrial robots, slewing bearings help robots move flexibly. It is the key to the normal operation of many large – scale and complex mechanical devices.

The Principle of Rust’s Damage to Bearings

Rust is essentially an iron oxide. When the iron on the surface of a slew bearing reacts chemically with oxygen and water in the air, rust is formed. Rust has a loose texture and a larger volume than iron, which can cause local stress concentration on the bearing surface and damage the bearing’s lubricating film. As rust continues to form and accumulate, it will intensify the internal friction of the bearing, raise the bearing temperature, and accelerate the aging and deterioration of the lubricant. At the same time, rust particles may become embedded between the rolling elements, raceways, and cages of the bearing, causing wear and pitting, which seriously affects the rotational accuracy and operating stability of the bearing.

Measures to Prevent Rust Damage

Material Selection

Choose Corrosion – Resistant Materials: During the design and selection stage, prioritize the use of corrosion – resistant bearing materials. For example, stainless – steel bearings have good corrosion – resistance and are suitable for working environments that are humid or contain corrosive gases or liquids. Common stainless steel materials such as 304 and 316 are used. Among them, 316 stainless – steel has better corrosion – resistance due to the addition of molybdenum, making it particularly suitable for use in harsh corrosion environments such as marine environments or chemical production.

Apply Surface Coating Materials: Surface coating treatment of bearings made of ordinary steel is also an effective way to improve their corrosion – resistance. Common coatings include galvanizing, nickel – plating, chromium – plating, etc. The galvanized layer can form a dense protective film on the bearing surface, effectively isolating oxygen and moisture. The nickel – plated layer can not only enhance the corrosion – resistance of the bearing but also improve its appearance quality and surface hardness. The chromium – plated layer has high hardness and wear – resistance, which can strengthen the anti – wear and anti – corrosion capabilities of the bearing surface.

Storage and Transportation

Control of Storage Environment: When storing bearings, place them in a dry and well – ventilated warehouse. The relative humidity of the warehouse should be kept at a low level, generally recommended to be no more than 60%. Dehumidifying equipment can be installed to maintain the stability of the humidity in the warehouse. At the same time, avoid placing bearings near windows, doors, or other locations where they are easily invaded by humid air. For bearings in long – term storage, it is best to use sealed packaging and place desiccants, such as silica gel desiccants, inside the packaging to further absorb the moisture in the package and prevent rust from forming.

Transportation Protection Measures: During the transportation of bearings, take good protective measures. Avoid exposing bearings directly to humid air. Sealed packaging boxes can be used for packaging. For bearings in long – distance transportation or sea transportation, to prevent the erosion of seawater moisture, anti – rust bags or anti – rust paper can be placed inside the packaging box. These anti – rust materials can release anti – rust gases, forming a protective film on the bearing surface to prevent rust. At the same time, pay attention to the bumps and collisions during transportation to prevent the bearing surface from being more prone to rust due to mechanical damage.

Installation and Use

Inspection and Treatment Before Installation: Before installing a bearing, carefully inspect its appearance to ensure that there are no rust marks or damages on the surface. If there are slight rust spots on the bearing surface, a special rust remover can be used for treatment. After rust removal, clean and lubricate the bearing with clean lubricating oil before installation. During the installation process, ensure that the installation tools and the installation environment are clean to avoid impurities from entering the bearing and scratching the bearing surface, which may cause rust.

Operation Environment Management: During the use of bearings, keep the operating environment of the equipment clean and dry. For equipment operating in humid environments, protective measures such as installing protective covers and sealing devices can be taken to prevent moisture and dust from entering the bearings. At the same time, regularly maintain and service the equipment, and promptly clean the dust and dirt on the equipment surface to avoid their accumulation and absorption of moisture, which may lead to rust on the bearings. In addition, control the temperature and humidity during the operation of the equipment to avoid the formation of condensate on the bearing surface due to excessive temperature changes.

Lubrication and Maintenance

Select Appropriate Lubricants: High – quality lubricants can not only reduce the friction and wear of bearings but also have anti – rust functions. Select appropriate lubricants according to the working conditions and environment of the bearings. In humid environments, lubricating greases with good anti – rust properties, such as lithium – based lubricating grease, can be selected. It has good water – resistance and anti – rust properties. For high – speed rotating bearings, lubricating oils with low viscosity and good anti – oxidation properties should be selected, and an appropriate amount of anti – rust additives should be added to enhance the anti – rust ability.

Regular Lubrication and Replacement: Lubricate the bearings regularly according to the equipment’s operating instructions. When adding or replacing lubricants, ensure that the old lubricants are completely removed to prevent impurities and moisture in the old lubricants from corroding the bearings. At the same time, pay attention to the service life of the lubricants and replace expired or deteriorated lubricants in a timely manner to ensure their anti – rust and lubrication performance.

Monitoring and Maintenance

Establish a Monitoring Mechanism: Utilize modern monitoring technologies such as vibration monitoring and temperature monitoring to understand the operating status of bearings in real – time. By analyzing vibration signals and temperature changes, it is possible to promptly detect whether there are abnormal wear or overheating phenomena in the bearings, and then determine whether factors such as rust affect the bearing performance. Once abnormalities are detected, take timely measures to deal with them.

Regular Maintenance and Inspection: Develop a reasonable maintenance and inspection plan and regularly disassemble and inspect the bearings. Check for rust marks on the bearing surface, wear conditions, and the state of the lubricant. For minor rust marks found, deal with them in a timely manner. For bearings with severe wear or rust, replace them in a timely manner to avoid causing greater damage to the equipment.

Preventing rust from damaging bearings requires taking comprehensive and effective measures from multiple aspects, including material selection, storage and transportation, installation and use, lubrication and maintenance, and monitoring and maintenance. Only in this way can the erosion of rust on bearings be minimized, the lifespan of bearings be extended, the normal and stable operation of mechanical equipment be ensured, the maintenance costs and downtime of equipment be reduced, and the production efficiency and economic benefits of enterprises be improved.

The Price of Slewing Bearings with Rust – Prevention Capabilities

The price of slewing bearings with rust – prevention capabilities is influenced by multiple factors. In terms of materials, using corrosion – resistant materials such as stainless steel and special alloys, or applying high – quality anti – rust coatings will increase the cost and thus raise the price. In terms of processing, high – precision machining and advanced surface treatment processes can improve rust – prevention performance and quality, but the large investment also drives up the price.

Supplier of Slewing Bearings

LDB Bearing Company is a leading enterprise in the bearing industry with remarkable strength. Since its establishment in 1999, it has worked hard from obscurity and has become a mainstay in the industry with its dedication to quality and enthusiasm for innovation. The products developed and manufactured by the company are widely used in many fields. Among them, the spur – gear slewing drive has high precision and good stability, which significantly improves the operation performance of industrial welding robots. Moreover, the company attaches great importance to product quality, strictly adheres to high standards, and has passed the ISO9001:2015 quality management system certification of TUV Germany. With its excellent quality and high – quality services, its products are sold to 73 countries and regions around the world, winning the trust of customers. It is bound to lead the industry to new heights in the future.

The Application of Recyclable Materials in Bearing Manufacturing

April 4, 2025/in Bearing Knowledge /by wang

The bearing manufacturing industry is exploring the use of recyclable materials to achieve sustainable development. The application forms include the recycling and reuse of metals, plastics, and composite materials.

What is Slewing Bearing Using New Materials?

A slewing bearing using new materials is manufactured with materials possessing special properties, building upon traditional designs. For example, carbon fiber composite materials with high strength and low density can reduce its own weight while enhancing load – bearing capacity, making them suitable for weight – sensitive fields such as aerospace. Self – lubricating materials are also used. These materials eliminate the need for frequent lubricant addition, reducing maintenance costs and pollution. They are commonly used in slewing bearings for food processing machinery. These new materials enable slewing bearings to perform better in terms of accuracy, corrosion resistance, and service life, meeting the requirements of modern industry for high – performance, long – lasting, and low – maintenance equipment, and driving the renewal and upgrading of mechanical equipment in various industries.

Application Forms of Recyclable Materials in Bearing Manufacturing

Recycling and Reuse of Metal Materials

Metal materials play a significant role in bearing manufacturing. Steel is one of the most commonly used materials for bearing manufacturing. Scrap steel has a wide range of sources, such as scrapped automobiles and mechanical parts. By recycling this scrap steel and subjecting it to processes like sorting, smelting, and refining, steel that meets the requirements of bearing manufacturing can be obtained again. For instance, after smelting, the impurities in recycled scrap steel are removed, and its chemical composition is adjusted. Then, through processes like rolling, steel for bearing rings and rolling elements can be produced. This recycling and reuse method can not only reduce the environmental damage caused by iron ore mining but also lower the energy consumption in the steel production process.

In addition to steel, non – ferrous metals such as copper and aluminum are also used in bearing manufacturing, for example, in manufacturing components like cages. Waste copper and aluminum products, such as discarded electrical wires and cables, and aluminum cans, can be processed through specific recycling processes. Recycled copper, after refining to remove impurities, can be used to manufacture high – precision bearing cages. Its good electrical and thermal conductivity helps improve the performance of bearings. Recycled aluminum, after melting and processing, can be made into aluminum alloy cages, which have the advantages of light weight and high strength and play an important role in some bearing application scenarios with strict weight requirements.

Recycling and Utilization of Plastics and Composites

In modern Slew bearing manufacturing, plastics and composites are also widely used in manufacturing components such as seals and cages. Recycled plastics, such as discarded plastic bottles and pipes, can be processed into recycled plastic pellets through processes like crushing and granulation, and then used to manufacture bearing seals and some cages. For example, polyamide (PA) plastic is commonly used to make bearing cages. Recycled PA plastic can be re – processed and formed into cages with excellent performance after treatment.

The recycling of composites is relatively complex but also of great significance. Some high – performance bearings are made of carbon fiber – reinforced composite materials, which are high in strength and low in weight. For discarded carbon fiber composite products, the carbon fibers can be separated from the matrix materials through methods such as pyrolysis and chemical dissolution, and then reused to manufacture new composite components, or mixed with other materials to manufacture bearing components with slightly lower requirements, thus achieving the recycling of resources.

Challenges in Using Recyclable Materials

Material Performance Consistency Issues

Recyclable materials come from a wide range of sources with varying qualities, resulting in significant differences in their properties. For example, recycled scrap steel may contain different types and amounts of impurities. Even after refining, it is difficult for its chemical composition and mechanical properties to be exactly the same as those of virgin materials. These performance differences can affect the quality and reliability of bearings, such as causing uneven hardness and reduced fatigue life of bearings.

For plastics and composites, degradation and aging during the recycling process can change their properties. Recycled plastics may experience a decrease in molecular weight and a decline in mechanical properties, which poses challenges for manufacturing high – precision and high – performance bearing components. Ensuring the consistency of the performance of recycled materials is one of the key issues in the application of recyclable materials in bearing manufacturing.

Recycling Costs and Economic Benefits

Recycling recyclable materials and processing them into raw materials suitable for bearing manufacturing requires certain investment. This includes the costs of collection, transportation during the recycling process, as well as subsequent costs of sorting, smelting, refining, and processing. For example, the smelting process of recycling scrap steel consumes a large amount of energy and requires high – quality equipment, which increases the recycling cost.

In terms of economic benefits, if the cost of recycled materials is too high and the price advantage of the manufactured bearing products in the market is not obvious, enterprises may find it difficult to obtain sufficient profits. Therefore, enterprises need to comprehensively consider factors such as the selection of recycled materials, the optimization of recycling processes, and product pricing to find a balance between recycling costs and economic benefits.

Technical and Process Difficulties

The use of recyclable materials in bearing manufacturing requires corresponding technical and process support. Currently, the processing technologies for some recycled materials are not mature enough to meet the high – precision requirements of bearing manufacturing. For example, for waste metal materials containing multiple impurities, existing refining technologies may not be able to completely remove all impurities, affecting the purity and performance of the materials.

For the recycling of composites, the lack of efficient and low – cost separation technologies makes recycling difficult. In addition, processing recycled materials into components that meet the requirements of bearing manufacturing requires the improvement and innovation of existing manufacturing processes. For example, when using recycled plastics to manufacture bearing seals, new molding processes need to be developed to ensure the dimensional accuracy and sealing performance of the seals.

Strengthening Material Testing and Quality Control

Establish a strict material testing system to conduct comprehensive and detailed tests on recycled materials. Before recycled materials enter the production process, test their chemical composition, mechanical properties, impurity content, and other indicators, and classify and screen them according to the test results. For materials with significant performance differences, take corresponding treatment measures, such as secondary refining of recycled steel to adjust its chemical composition to meet the standards of bearing manufacturing.

During the production process, strengthen quality control and conduct strict quality inspections on bearing components manufactured using recycled materials. Through means such as non – destructive testing and performance testing, ensure that product quality meets the requirements. For example, conduct hardness testing and flaw detection on bearing rings, and conduct dimensional accuracy testing and fatigue life testing on rolling elements to promptly identify and address quality issues.

Optimizing Recycling Processes and Reducing Costs

Increase investment in the research and development of recycling processes and develop efficient and energy – saving recycling technologies. For example, the use of advanced smelting technologies such as electric arc furnace smelting can improve the smelting efficiency of waste metals and reduce energy consumption. Develop new plastic recycling and processing technologies, such as a combination of physical and chemical modification methods, to improve the performance of recycled plastics and reduce the impact of performance degradation on bearing manufacturing.

Enterprises can cooperate with recycling enterprises to establish stable recycling channels and reduce the procurement cost of recycled materials. Optimize the production process, improve production efficiency, and reduce cost waste in the processing of recycled materials and bearing manufacturing. Through large – scale production, reduce the production cost per unit product and improve economic benefits.

Promoting Technological Innovation and Cooperation

Bearing manufacturing enterprises should strengthen cooperation with scientific research institutions and universities to jointly carry out research on the technologies of using recyclable materials in bearing manufacturing. Develop new material processing technologies and manufacturing processes to solve key problems such as the performance consistency of recycled materials and separation technology difficulties. For example, use nanotechnology to perform surface treatment on recycled materials to improve their wear resistance and corrosion resistance; develop new composite material recycling and separation technologies to improve recycling efficiency and quality.

Enterprises within the industry should also strengthen communication and cooperation, share experiences and technical achievements in the application of recyclable materials, and jointly promote the development of the industry. By establishing industry standards and specifications, standardize the quality standards and manufacturing processes of recycled materials to promote the wide application of recyclable materials in bearing manufacturing.

The Price of Slewing Bearings

The price of slewing bearings is affected by multiple factors. Materials are crucial. Slewing bearings made of high – grade steel and special alloys have better strength and wear resistance, higher costs, and thus higher prices. For example, slewing bearings containing special alloys are more expensive than those made of ordinary materials. Processing accuracy is also important. High – precision processing requires advanced equipment and complex techniques, which increases costs and naturally makes the product price higher. Slewing bearings used in precision equipment generally have a relatively high price. The manufacturing process also affects the price. Advanced manufacturing processes can enhance performance but also increase costs and thus raise the selling price. In addition, market supply and demand have a significant impact on prices. When demand is high, prices rise; when demand is low, prices fall.

Supplier of Slewing Bearings

LDB Bearing Company is truly a legend in the bearing industry! Since its establishment in 1999, it has made continuous progress and grown from obscurity to become a leading enterprise in the industry. The company is located in Luoyang, Henan Province, where the bearing industry is well – developed, enjoying the advantages of industrial resources. Its products embody technology and craftsmanship and are widely used in fields such as industrial robots and laser cutting machines. For example, its spur – gear slewing drive has extremely high precision and strong stability, greatly improving the operation accuracy and efficiency of industrial welding robots. Moreover, the company attaches great importance to product quality and strictly controls it. With its excellent quality and attentive service, its products sell well. It is believed that in the future, LDB Bearing Company will continue to shine brightly and contribute more to the development of the bearing industry!

Approaches to Handling Old Slewing Bearings

April 4, 2025/in Bearing Knowledge /by wang

The disposal of old slewing supports is related to resource recovery, environmental protection and economic benefits. Old slewing supports are components replaced from equipment for various reasons. They have various problems and can be treated differently according to the degree of wear.

What are Old Slewing Bearings?

An old slewing bearing refers to a slewing bearing component that has been used on mechanical equipment and is replaced due to reasons such as long – term operation, wear and tear, aging, or equipment upgrading. A slewing bearing itself is a mechanical component that can withstand comprehensive loads and enable relative slewing motion. It is commonly found in equipment such as cranes, excavators, and port machinery. Old slewing bearings may have problems such as worn raceways, damaged rolling elements, and aged seals, which lead to a decline in accuracy and performance, making them unable to meet the normal operation requirements of the equipment. However, after evaluation, some old slewing bearings can be reused through repair and renovation, while those with severe wear are subject to material recycling to achieve resource circulation.

Slightly Worn Slewing Bearings

There are various ways to recycle and reuse old slewing bearings. For slewing bearings with slight wear and an intact structure, they can be rejuvenated through repair and renovation. First, the slewing bearing is completely disassembled and cleaned, and each component is carefully inspected for wear and deformation. For the worn raceways and rolling elements, professional grinding and quenching processes are used for repair to restore their dimensional accuracy and surface hardness. After renovation, the slewing bearings are subject to strict quality inspection. Once all performance indicators meet the standards, they can be reused in equipment with relatively lower accuracy requirements, such as small – scale construction machinery and material handling equipment. This can not only significantly reduce the equipment procurement cost but also reduce the energy consumption and environmental pollution during the production of new slewing bearings.

Severely Worn Slewing Bearings

For old slewing bearings with severe wear that cannot be repaired, material recycling is the main treatment approach. Slewing bearings are mostly made of steel. They can be disassembled and recycled separately. Through professional mechanical disassembly equipment, components such as the inner and outer rings, rolling elements, and cages of the slewing bearing are separated, and the oil stains and impurities on the surface are removed. The sorted steel can be remelted in a furnace to make new steel products, which are used to manufacture various mechanical parts, building materials, etc. In addition to steel, some slewing bearings may contain non – ferrous metals such as copper and zinc. Specific separation technologies can be used to separate these non – ferrous metals, which can also achieve recycling and improve the comprehensive utilization rate of resources.

Other Methods for Handling Slewing Bearings

When handling old slewing bearings, the remanufacturing of their components can also be considered. Components on old slewing bearings that still have usability, such as some unworn rolling elements and seals, can be cleaned, inspected, and re – processed, and then reassembled into new slewing bearings or used for the repair of other equipment. This approach can not only make full use of the remaining value of old slewing bearings but also reduce the production of new components, thereby reducing production costs and resource consumption.

Problems in Handling Old Slewing Bearings

When handling old slewing bearings, environmental protection issues cannot be ignored. Pollutants such as oil stains and lubricating oil generated during the disassembly process need to be properly treated. Special oil – stain treatment equipment is used to collect the oil stains, and the oil and water are separated through oil – water separation technology. The separated oil can be recycled, and the wastewater needs to be treated to meet the environmental protection discharge standards before it can be discharged. In addition, measures should be taken to control the noise and dust generated during the disassembly and recycling process, such as setting up sound – insulation facilities in the operation area and installing dust collection devices, to reduce the impact on the surrounding environment and personnel.

To effectively handle old slewing bearings, industry collaboration and standard – setting are of great significance. Manufacturers, users, and recycling and treatment enterprises of slewing bearings should strengthen cooperation and establish a complete recycling system. Manufacturers can provide technical support and guidance for the recycling of old slewing bearings. Users should promptly deliver waste slewing bearings to recycling and treatment enterprises, and recycling and treatment enterprises should use professional technologies and equipment for efficient processing. At the same time, relevant departments should formulate unified recycling and treatment standards and specifications for old slewing bearings, clarify the treatment process, quality requirements, and environmental protection standards, and strengthen the supervision of recycling and treatment enterprises to ensure that the treatment process of old slewing bearings complies with the regulations and achieves the dual goals of resource recycling and environmental protection.

Handling old slewing bearings is a complex and important task that covers multiple aspects such as recycling and reuse, environmental protection measures, and industry collaboration. Through scientific and reasonable handling methods, the maximum utilization of resources can be achieved, environmental pollution can be reduced, and strong support can be provided for the sustainable development of the industry. With the continuous progress of technology and the improvement of people’s environmental awareness, it is believed that the handling of old slewing bearings will be more efficient and environmentally friendly in the future, contributing more to the construction of a resource – saving and environment – friendly society.

The Price of Slewing Bearings

The price of slewing bearings is affected by multiple factors. Materials are crucial. Slewing bearings made of high – grade steel and special alloys have better strength and wear resistance and are more expensive. Processing accuracy is also important. High – precision processing requires high – end equipment and advanced technology, increasing costs and thus raising the product price. Market supply and demand also affect prices. When the demand from industries such as construction and wind power is high, resulting in a shortage of supply, the price rises. When the demand is weak and the supply is excessive, the price drops. In addition, brand value and the quality of after – sales service can also influence the price of slewing bearings to a certain extent.

Supplier of Slewing Bearings

LDB Bearing Company is truly remarkable! Over the past two decades, it has risen from obscurity to become a leading enterprise in the industry. It has always adhered to meticulous manufacturing, and its products are of excellent quality. For example, its high – precision slewing bearings are widely used in many fields. It also continues to innovate. The self – developed spur – gear slewing drive has helped to upgrade industrial welding robots. Moreover, it adheres to the concept of “serving the world” and provides considerate after – sales service. Thanks to these efforts, it has won the hearts of global customers. In the future, it is certain to continue to shine in the bearing industry and contribute to the development of the world’s industry!

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