Tunnel Boring Slewing Bearing

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Tunnel Boring Slewing Bearing

Driving reliability to cut tunnel completion times, slewing bearings for tunnel boring machines are built to withstand huge loads as cutter heads bore into solid rock or dificult soils. These heavy-duty, roller bearings are designed  to carry all cutter head loads and transfer  them to the rear. In addition, we use our sealing expertise to integrate proven designs for tunnel boring machine head applications that keep earth out of the main bearing and lubricants in it.

We offer solutions for a broad array of applications based on our wide variety of experience in major tunnel projects worldwide including.

“has the best bearing cages and was able to ind logistics solutions to meet our expectations in a very short time.”– Tunnel boring customer.

Slewing Driver Application

Slewing bearing comes in many sizes

Wind Turbine Bearings

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Wind energy Turbines

Drawing on a wealth of wind turbine engineering knowledge, LDB has developed an innovative slewing bearing design with enhanced sealing capabilities and redesigned internal geometry to meet the challenges of the wind industry.

The LDB High Endurance Slewing Bearing offers increased resistance to harsh environmental conditions to improve reliability and performance and extend bearing service life.“With its advanced technical knowledge, LDB was a reliable development partner for my windmill slewing bearing solutions.”– Wind energy customer.

Wind turbines generate electricity under adverse and constantly changing conditions, both on and offshore. Efficient power generation from wind turbines demands high performance from every component – particularly the bearings used in the turbine drivetrain and gearbox.slewing bearing


LDB rolling bearings for these applications perform with robust resistance to seizure, wear, flaking and unique challenges such as white etching cracks (WEC) to deliver advanced product design solutions for a reliable and sustainable operating life.

Slewing Ring Bearings in Construction and Excavator and Roller Applications

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Slewing Ring Bearings in Construction and Excavator and Roller Applications

LDB slewing bearings of the preloaded,cross-roller type are an ideal choice for excavators as they offer high reliability even when subject to heavy loads and tilting moments in severe operating

environments.

LDB also works closely with road roller to provide customised slewing bearing solutions designed to handle the high vibration levels needed for highspeed,high-quality compacting. Due to an integrated, reinforced sealing system,the bearings remain unaffected by the hot asphalt environment and are protected against water intrusion.

¿La rugosidad de la superficie del cojinete de giro es lo más pequeña posible? ¿Como escoger?

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¿La rugosidad de la superficie del cojinete de giro es lo más pequeña posible? La rugosidad de la superficie se refiere al pequeño espacio y la irregularidad de los pequeños picos y valles que tiene la superficie mecanizada. La rugosidad de la superficie del cojinete puede afectar la resistencia al desgaste, la estabilidad, la resistencia a la fatiga, la estabilidad y otras propiedades del cojinete. En términos generales, cuanto menor sea la rugosidad de la superficie de apoyo, mejor, pero debe determinarse de acuerdo con los requisitos de uso del equipo y la precisión del proceso.

La rugosidad de la superficie del cojinete de giro no es tan pequeña como sea posible.

Slewing Bearings

¿La rugosidad de la superficie del cojinete de giro es lo más pequeña posible? Se puede analizar desde los siguientes aspectos:

1. Propiedades físicas de los materiales

La rugosidad de la superficie del rodamiento a menudo se representa por Ra. En términos generales, desde el principio de funcionamiento, esperamos que cuanto menor sea la rugosidad de la superficie del cojinete de giro, mejor. En general, cuanto mayor sea el nivel de precisión de la tolerancia del rodamiento, mejor será la calidad de la superficie y más fina será la mano de obra. Sin embargo, dos superficies que son demasiado lisas son propensas al pegado (intercambio entre materiales iguales o similares, que es similar al “fenómeno de teñido” en nuestra vida, pero aquí pertenece al intercambio de sustancias metálicas), mientras que las superficies que son demasiado ásperas son propensas a pegarse. Bajo la acción de la fuerza, la superficie tiende a desprenderse (es decir, lo que a menudo llamamos desgaste).

2. Costo de procesamiento

Teóricamente, cuanto menor sea el valor de la rugosidad de la superficie del cojinete de giro, mejor, menor será la rugosidad, más suave será la superficie y más bella será la apariencia. Sin embargo, el tamaño de la rugosidad está determinado por el proceso de mecanizado y otros factores, como la fricción entre la herramienta y la superficie de apoyo, el corte y la vibración de alta frecuencia en el proceso.

Sin embargo, cuanto menor sea la rugosidad de la superficie, mayor será el costo de procesamiento. Si el costo de uso de la pieza coincide con la velocidad de consumo y el beneficio del valor de salida de producción del equipo. Todos estos deben ser considerados. Algunas piezas de repuesto no tienen altos requisitos en cuanto a la rugosidad de la superficie de apoyo. La búsqueda excesiva de la rugosidad de la superficie afectará la economía del procesamiento.

Principio de selección de la rugosidad de la superficie del rodamiento giratorio

slewing bearing

1. Perspectiva económica:

Desde un punto de vista económico, sobre la base de cumplir con los requisitos de rendimiento del rodamiento giratorio, cuanto menor sea la precisión, mejor. Esto permite reducir los costos de producción.

2. Función de uso:

(1) El valor de rugosidad de la superficie de trabajo es menor que el de la superficie de no trabajo.

(2) El valor de rugosidad de la superficie de fricción es menor que el de la superficie sin fricción.

(3) El valor de rugosidad del ajuste con juego es menor que el del ajuste con interferencia.

(4) La rugosidad de la superficie de contacto debe ser equivalente a sus requisitos de precisión dimensional. Cuanto menor sea el tamaño, menor debe ser el valor de rugosidad.

(5) El valor de rugosidad de la superficie sujeta a carga cíclica y el filete interno y la parte cóncava donde puede ocurrir la concentración de tensión debe ser pequeño.

¿La rugosidad de la superficie del cojinete de giro es lo más pequeña posible? Creo que todo el mundo es claro. La selección real de la precisión del rodamiento y la rugosidad de la superficie debe determinarse de acuerdo con las necesidades reales. En el caso de garantizar el rendimiento de los rodamientos, el control de costos también es muy importante.

Шероховатость поверхности поворотного подшипника как можно меньше? Как выбрать?

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Шероховатость поверхности поворотного подшипника как можно меньше? Шероховатость поверхности относится к небольшому промежутку и неровности небольших пиков и впадин, которые имеет обработанная поверхность. Шероховатость поверхности подшипника может повлиять на износостойкость, стабильность, усталостную прочность, стабильность и другие свойства подшипника. Вообще говоря, чем меньше шероховатость поверхности подшипника, тем лучше, но она должна определяться в соответствии с требованиями использования оборудования и точностью процесса.

Шероховатость поверхности поворотного подшипника не настолько мала, насколько это возможно.

Slewing Bearings

Шероховатость поверхности поворотного подшипника как можно меньше? Его можно проанализировать со следующих аспектов:

1. Физические свойства материалов

Шероховатость поверхности подшипника часто обозначается Ra. Вообще говоря, исходя из принципа работы, мы надеемся, что чем меньше шероховатость поверхности поворотного подшипника, тем лучше. Как правило, чем выше уровень точности допуска подшипника, тем лучше качество поверхности и выше качество изготовления. Однако две слишком гладкие поверхности склонны к склеиванию (обмен между одинаковыми или подобными материалами, что подобно «феномену окрашивания» в нашей жизни, но здесь относится к обмену металлическими веществами), в то время как поверхности, слишком шероховатые склонны к склеиванию. Под действием силы поверхность склонна к отслаиванию (то есть тому, что мы часто называем износом).

2. Стоимость обработки

Теоретически, чем меньше значение шероховатости поверхности поворотного подшипника, тем лучше, чем меньше шероховатость, тем ровнее поверхность и тем красивее внешний вид. Однако размер шероховатости определяется процессом обработки и другими факторами, такими как трение между инструментом и опорной поверхностью, резание и высокочастотная вибрация в процессе.

Однако чем меньше шероховатость поверхности, тем выше стоимость обработки. Соответствует ли стоимость использования детали скорости потребления и прибыли от стоимости продукции оборудования. Все это необходимо учитывать. К некоторым запчастям не предъявляются высокие требования по шероховатости опорной поверхности. Излишняя погоня за шероховатостью поверхности скажется на экономичности обработки.

Принцип выбора шероховатости поверхности опорно-поворотного устройства

slewing bearing

1. Экономическая перспектива:

С экономической точки зрения, исходя из требований к производительности поворотного подшипника, чем ниже точность, тем лучше. Это позволяет снизить производственные затраты.

2. Используйте функцию:

(1) Значение шероховатости рабочей поверхности меньше, чем у нерабочей поверхности.

(2) Значение шероховатости поверхности трения меньше, чем у поверхности, не имеющей трения.

(3) Значение шероховатости посадки с зазором меньше, чем у посадки с натягом.

(4) Шероховатость сопрягаемой поверхности должна соответствовать требованиям точности ее размеров. Чем меньше размер, тем меньше должно быть значение шероховатости.

(5) Величина шероховатости поверхности, подверженной циклическим нагрузкам, а также внутренней галтели и вогнутой части, где может возникнуть концентрация напряжений, должна быть небольшой.

Шероховатость поверхности поворотного подшипника как можно меньше? Я верю, что всем все ясно. Фактический выбор точности подшипника и шероховатости поверхности должен определяться в соответствии с фактическими потребностями. В случае обеспечения работоспособности подшипников также очень важен контроль затрат.

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.