Is the surface roughness of the slewing bearing as small as possible? How to choose?

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Is the surface roughness of the slewing bearing as small as possible? Surface roughness refers to the small spacing and the unevenness of small peaks and valleys that the machined surface has. The roughness of the bearing surface may affect the wear resistance, stability, fatigue strength, stability and other properties of the bearing. Generally speaking, the smaller the roughness of the bearing surface, the better, but it should be determined according to the equipment use requirements and process accuracy.

The surface roughness of the slewing bearing is not as small as possible

Slewing Bearings

Is the surface roughness of the slewing bearing as small as possible? It can be analyzed from the following aspects:

1. Physical properties of materials

The surface roughness of the bearing is often represented by Ra. Generally speaking, from the working principle, we hope that the smaller the surface roughness of the slewing bearing, the better. Generally, the higher the bearing tolerance accuracy level, the better the surface quality and the finer the workmanship. However, two surfaces that are too smooth are prone to gluing (exchange between the same or similar materials, which is similar to the “dyeing phenomenon” in our life, but it belongs to the exchange of metal substances here), while the surfaces that are too rough are prone to gluing. Under the action of force, the surface is prone to peeling off (that is, what we often call wear).

2. Processing cost

Theoretically, the smaller the value of the surface roughness of the slewing bearing, the better, the smaller the roughness, the smoother the surface and the more beautiful the appearance. However, the size of the roughness is determined by the machining process and other factors, such as the friction between the tool and the bearing surface, cutting, and high-frequency vibration in the process.

However, the smaller the surface roughness, the higher the processing cost. Whether the use cost of the part matches the consumption speed and the profit of the equipment production output value. These all need to be considered. Some spare parts do not have high requirements on the roughness of the bearing surface. Excessive pursuit of the surface roughness will affect the economy of processing.

Selection principle of surface roughness of slewing bearing

slewing bearing

1. Economic perspective：

From an economic point of view, on the basis of meeting the performance requirements of the slewing bearing, the lower the accuracy, the better. This allows for lower production costs.

2. Use function:

(1) The roughness value of the working surface is smaller than that of the non-working surface.

(2) The roughness value of the friction surface is smaller than that of the non-friction surface.

(3) The roughness value of the clearance fit is smaller than that of the interference fit.

(4) The roughness of the mating surface should be equivalent to its dimensional accuracy requirements. The smaller the size, the smaller the roughness value should be.

(5) The roughness value of the surface subjected to cyclic load and the inner fillet and concave part where stress concentration may occur should be small.

Is the surface roughness of the slewing bearing as small as possible? I believe everyone is clear. The actual selection of bearing accuracy and surface roughness needs to be determined according to actual needs. In the case of ensuring bearing performance, cost control is also very important.

Slewing Bearing Comes In Many Sizes

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Slewing bearing comes in many sizes

LDB Slewing Bearing Manufacturer custom designed and manufactured a segmented, 3-row roller bearing almost 14 m in diameter. It weighed 70 tons.LDB Slewing Bearing Manufacturer also produces a range of smaller slewing bearings for special machinery,high-tech applications and more.

For more than a half century, LDB Slewing Bearing Manufacturer has been designing and manufacturing many types and sizes of high-performance slewing bearings to meet the speciic needs of customers worldwide. Combining decades of application knowledge and unmatched manufacturing expertise, LDB Slewing Bearing Manufacturer provides customised slewing bearings with outer diameters from 0,1 m to 14 m.

Unlike other providers of slewing bearings, LDB Slewing Bearing Manufacturer can offer fully tailored slewing bearing solutions with integrated advanced monitoring, lubrication and sealing systems for higher reliability and longer service life. Our breadth of engineering knowledge, global presence and design lexibility allow us to deliver the right solution for your project, no matter how large or complex.

High-performance slewing bearings

For a wide range of applications:

  • Wind turbines
  • Tunnel boring machines
  • Excavators
  • Forestry vehicles
  • Rail vehicles
  • Dockside and deck cranes
  • Mobile cranes
  • Water treatment equipment
  • Bottle illing systems
  • Metals
  • Material handling
  • Marine pods
  • Offshore buoys
  • Stacker reclaimers

Model parameters of externally toothed three-row cylindrical roller slewing bearings

Slewing bearing design types:

  • Double row ball bearings
  • 4point

Contact bearings

  • Crossed roller bearings
  • Wire race bearings
  • 3row

and double row cylindrical roller bearings

  • Cylindrical roller and ball bearings
  • Special bearings

Slewing Bearing Monitoring Services And Savings

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Slewing bearing monitoring, services and savings

Reduce downtime with condition monitoring

LDB offers unmatched expertise and technology for monitoring your slewing bearing solutions and supporting your predictive maintenance needs. With a range of solutions as well as wireless solutions, we can help you monitor everything from contamination levels of grease and oil to vibration levels in critical locations around slewing bearings. We provide wear measurement, raceway crack detection using integrated ultrasonic probes and on-line bolt tension monitoring. Where a wired condition monitoring solution was not feasible in the past due to cost associated with initial infrastructure set-up, a variety of wireless solutions is also available nowadays.

Remanufacturing saves cost and time

LDB’s remanufacturing services can generate significant cost savings and save time when compared to purchasing a new bearing.

Our global sales and application engineering network is there to comply with your requests and assist when you face emergencies or require a bearing to be inspected and/or remanufactured.

Expert technical assistance To help you increase the service life of your slewing bearings, our specialist teams can plan and perform: mounting and dismounting, inspection in our workshops or on site, remanufacturing, checking slewing bearing seating flatness using a laser system and tensioning of bolts by using bolt tensioners, all to improve the quality, performance and reliability of your equipment and more.

The Power of Slewing Bearing Knowledge Engineering

Combining products, people, and applicationspecific knowledge, LDB delivers innovative solutions to equipment manufacturers and production facilities in every major industry worldwide.

Having expertise in multiple competence areas supports LDB Life Cycle Management, a proven approach to improv ing equipment reliability,optimizing operational and energy efficiency and reducing total cost of ownership.

These competence areas include bearings and units, seals, lubrication systems, mecha ronics,and a wide range of services, from 3-D computer modelling to cloud-based condition onitoringand asset management services.

LDB’s global footprint provides LDB customers with uniform quality standards and worldwide product availability. Our local presence provides direct access to the experience, knowledge and ingenuity of LDB people.

LDB improving reliability with Life Cycle Management

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Improving reliability with Life Cycle Management
Install and commission Operate and monitor Maintain and repair Specification De sign and develop Manufacture
From specification and design to maintenance and repair, at LDB we use our Life Cycle Management approach to optimize both slewing bearing performance and service life while reducing total cost of ownership.
Specification Design and develop Manufacture and test Install and commission Operate and monitor Maintain and repair.

Specification
With in-house specialists across a wide range of critical areas such as seals, lubrication,
wear protection and more, LDB enables you to work with application engineers and designers to find the right solution, right from the start. We can support your project by combining all of this application knowledge to improve designs and enhance performance of your slewing bearing solutions.

Design and develop
With over 20 years of slewing bearing experience and unmatched engineering expertise, we can help you design and develop high-performance slewing bearings from 0,1 m to 18 m (> 8 m to 18 m are segmented). Our Engineering Consultancy Services (ECS) can provide advanced calculations and simulations utilizing high-tech computer programmes to optimize and verify designs. All of these advantages combine to improve operational performance of application machinery and reduce total cost of ownership.

Manufacture and test
we offer fast, local access to LDB technologies,services and support. Our extensive logistics network provides excellent availability of LDB’s slewing bearing solutions.
To be able to offer slewing bearing manufacturing and testing excellence, LDB has developed close relationships with certifying authorities. Upon request, these authorities can certify the design of your slewing bearing solutions and witness testing. While individual divisions have been approved for quality certification in accordance with ISO 9001 and other customer specific requirements.

Install and commission
LDB Life Cycle Management features a range of expert services, training and products to provide timely, accurate commissioning of new and replacement machinery. Our offers include flatness measuring and machining of slewing bearing seatings or resin grout installation for larger slewing bearings.

Operate and monitor
By collecting and analyzing the correct operating data, LDB can help you identify the need for machinery maintenance activities. We can help protect your slewing bearing solutions against unexpected failures and costly downtime with grease and oil analysis, wear surement,
vibration monitoring and ultrasonic inspection of the bearing’s structural integrity.

Maintain and repair
LDB maintenance and remanufacturing services include everything from inspection to complete restoration to the full working specifications of slewing bearings, by using adapted and controlled processes to extend the service life of the slewing bearing.

Slewing driver application

slewing bearing solutions and services

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LDB slewing bearing solutions and services Optimize performance and service life

For more than 20 years, LDB has been designing and manufacturing many types and sizes of igh-performance slewing bearings to meet the specific needs of customers worldwide. Combining decadesof application knowledge, unmatched manufacturing expertise and our Life Cycle Management approach, LDB provides customized slewing bearings with outer diameters from 0,1 m to 18 m (>8 m to 18 m are segmented).

Unlike other providers of slewing bearings,LDB can offer fully tailored slewing bearing solutions with integrated advanced monitoring,lubrication and sealing systems for higher reliability and longer service life. Our wide range of expert slewing bearing services also help cut costs and optimize performance, while our global presence allows slewing bearing solutions and services to be delivered quickly around the world.

LDB Slewing bearing

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LDB Slewing bearing is a kind of rotating rolling element bearing or sliding bearing, which usually supports heavy but slowly rotating or swinging load. It is usually a horizontal platform, such as the windward platform of traditional crane, slewing stacker or horizontal shaft windmill.

Slewing bearing
Compared with other rolling element bearings, the section of slewing bearing is thinner, and the diameter is usually one meter or more.
LDB slewing ring is usually made of gear teeth integrated with the inner ring or outer ring, which is used to drive the platform relative to the base.
As a professional slewing ring supplier, we provide high-performance small and large slewing rings.

Slewing Driver Application

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Slewing reducer -Slewing driver can be applied to the host of the circular motion, such as the crane rotation platform and the rotation machinery, etc. The turbine and worm mechanisms are often used for two -axis intertwined, large transmission ratio, small transmission power, or intermittent work. This product can be widely used in the field of engineering machinery represented by high -altitude operating vehicles, car cranes, new energy fields represented by solar photovoltaic power generation, wind power generation, and other fields of automation, machine tool manufacturing, aerospace communications and other fields. Therefore, the product’s market potential is huge.

Slewing drive
Slewing reducer –Slewing driver Subjective list

Rotate machine with a dual snail turn drive drive

Driver driver with a car

Heavy tablet transport vehicle turning driver

High -altitude operating vehicle turning driver

Railway turning driver Driven driver

Slewing claws with rotation driver

Bridge detection vehicle rotation driver device

China Railway Liangji Slewing Driver Device

Solar turning driver

Wind Turbine Bearings Market

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According to the 2022 “Wind Turbine Bearings Market” research report, investment in the wind bearing industry is moving towards high quality, high quality and process, focusing on the development of unique wind turbines, and construction begins on the sea and the sea.

wind-bearings
Bearings in wind turbines have different designs, the most common design combination of CRB\TRB and rolling bearings, to meet different market needs.
In the application of wind turbine bearings, one of the selected bearings is a larger bearing, which has a longer service life and greater friction, which reduces the power generation efficiency of the turbine. Bearings currently in use are too costly to replace, and we need to be stronger than today’s bearing technology and stronger and more durable than existing materials.slewing berarings
Bearings of wind turbines are the focus of this research. When the bearing is working, it must bear the pressure in the movement, and can maintain a good internal movement effect.
According to the survey, the new wind turbine bearings are stronger and more efficient. The global wind turbine bearing market is expected to reach USD 9.6 billion in 2024. The next generation of wind turbines is cheaper, more powerful, and lasts longer. The widespread use of new bearings makes turbine equipment an optimal choice for renewable energy generation.

How is the slewing bearing soft belt produced? The installation position of the flexible belt

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The raceway of the slewing bearing generally needs to be heat treated. In the heat treatment process, because the diameter of the raceway circle of the slewing bearing is relatively large, flame surface quenching is usually used. The method is to use acetylene to heat the surface of the workpiece to be hardened and then add water to cool it. , this process is completed continuously.

1. How is the slewing bearing soft belt produced?

During the production and processing of the slewing bearing, the raceway of the device generally needs to be heat treated. The usual processes are: forging → rough machining → quenching and tempering treatment → finishing → raceway surface flame surface quenching → raceway surface grinding and other processes . One of the raceway surfaces is flame quenched to form a soft band.
The so-called soft belt is the area that has not been heat treated. The formation of the soft band is necessary for the heat treatment process. In the heat treatment process of the slewing bearing, because the diameter of the raceway circle of the slewing bearing is relatively large, flame surface quenching is usually used. The method is to use acetylene to heat the surface of the workpiece to be hardened and then add water to cool it.

Slewing Bearings

The heated flame spray gun and water gun are mounted together while making a circular motion along the circle of the workpiece. When the movement is close to 360 degrees, the heating and water spray are stopped immediately. That is, the circular areas of heating and water spray do not overlap. Cracks in the workpiece can occur if the circle areas where the heating and water spray occur overlap (heat treatment at an angle greater than 360 degrees on the circle). The tangential width of the unheated area is typically 15 mm. This 15 mm area is called the soft belt in the slewing bearing, that is, the so-called soft belt is the area without heat treatment. The formation of the soft band is essential to the heat treatment process.
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Under normal circumstances, the steel character “S” is marked on the position where the soft belt exists in the workpiece to indicate the specific soft belt position. The installation position of the soft belt is essentially to improve the life of the bearing. From the perspective of the user and the manufacturer, it is still a reasonable position to install the upper and lower ring soft belts of the slewing bearing. Therefore, the manufacturer of the slewing bearing should accurately mark the position of the soft belt of the slewing bearing, and the manufacturer and installer should reasonably install the position of the soft belt of the slewing bearing as needed.

2. The installation position of the soft belt

Slewing Bearings

Usually the upper loop flexible belt of the slewing device is installed at a position perpendicular to the projection line of the pitching rotation plane. For example, the upper loop flexible belt of the slewing device of a ship loader or stacker-reclaimer should be installed at a position perpendicular to the center line of the cantilever and cut through the center of rotation , that is, standing at a 90-degree position facing the left or right side of the cantilever on the center of rotation. In the usual mechanical design, the soft belt does not have the stress state of the support roller of the slewing bearing device at this position.

The installation position of the lower ring soft belt of the slewing device should be determined according to the center of gravity of the equipment and the range of the slewing angle. If the rotation angle is 100 degrees left and right, and the center of gravity of the upper part of the rotation is in the front, it is recommended to install the lower ring soft belt at the rear, that is, at a position of 180 degrees. If the change position of the center of gravity of the upper part of the rotation is the same in the front and rear positions, the angular position of the lower ring soft belt can be installed arbitrarily.
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Because of the inevitability of the soft belt on the slewing bearing device, it is required that the user who uses and selects the slewing bearing device should install the position of the soft belt reasonably, so as to improve the service life of the bearing. The general principle is to try to install the soft belt in a position where the soft belt is under less pressure during the load change.