How was the standard for the parallelism accuracy requirements of the mounting plane developed?

What is three-row cylindrical roller slewing ring?

The three-row cylindrical roller slewing ring is composed of an inner ring, an outer ring, three rows of cylindrical rollers, a cage and a sealing device, and its unique structure enables it to withstand axial force, radial force and overturning moment at the same time, and the rollers roll in the raceway to achieve smooth rotation during work. It has high bearing capacity, suitable for large cranes and other heavy-duty equipment, strong rigidity, high precision, can meet the high-precision needs of precision machine tools, stable operation and low noise, and long service life under normal use. Widely used in construction machinery, energy industry and other fields, the price is affected by size, accuracy, brand and market supply and demand, installation needs to strictly check the radial circular runout, axial channeling momentum, installation plane parallelism and ring gear runout and gear pitch accuracy and other points to ensure that its performance is reliable.

Features of three-row cylindrical roller slewing rings

Three-row cylindrical roller slewing rings have a number of distinctive features that make them stand out from the crowd in mechanical areas:

Super load capacity: The design is equipped with three rows of cylindrical rollers, two rows are responsible for axial forces, and one row is responsible for radial forces. This layout allows it to cope with high-intensity loads from different directions at the same time, and the carrying capacity far exceeds that of ordinary slewing rings, which can easily support the stable operation of large cranes, wind turbines and other equipment under heavy load conditions.

High rigidity and high precision: The special structure gives it excellent rigidity and minimal deformation after loading. During operation, it can ensure that the equipment maintains high-precision rotation, provide reliable support for precision machine tools, radar antenna mounts and other equipment with high precision requirements, and ensure the accuracy of processing and operation.

Smooth operation and low noise: the cylindrical rollers are in line contact with the raceway, and the contact area is large, which greatly reduces the rolling friction. During the operation of the equipment, it shows a high degree of stability, and the noise and vibration levels are extremely low, which not only improves the stability of the equipment operation, but also creates a good working environment.

Long service life: Based on the strong load-bearing capacity, good rigidity and smooth running characteristics, the service life of the three-row cylindrical roller slewing ring is significantly extended under normal use conditions. This means that equipment maintenance and replacement are less frequent, significantly reducing operating costs.

Compact structure: Compared with some other slewing ring types, the three-row cylindrical rollers are designed to make the axial and radial dimensions smaller and more compact than some other slewing ring types. This facilitates the overall design of the machine, helps to miniaturize the equipment, and saves valuable installation space.

How was the standard for the parallelism accuracy requirements of the mounting plane developed?

The formulation of the standard for the accuracy of the installation plane parallelism of the three-row cylindrical roller slewing ring is mainly based on the following aspects:

The working principle and structural characteristics of the slewing ring: the three-row cylindrical roller slewing ring realizes relative rotation through the rolling of the cylindrical rollers in the raceway, and at the same time bears the axial force, radial force and overturning moment. In order to ensure that the rollers are evenly stressed and roll smoothly in the raceway, the installation plane must have a high degree of parallelism, otherwise it will lead to uneven force on the rollers, accelerated wear and even failure. For example, if the mounting planes are not parallel, the cylindrical rollers will be subjected to additional lateral forces during the rolling process, affecting the rotation accuracy and service life.

Load capacity and load distribution: According to the design load capacity of the slewing ring, it is necessary to ensure that the parallelism of the installation plane can ensure that the load is evenly distributed on each roller and raceway under the rated load. If the mounting plane parallelism is not good, it may cause some rollers to be subjected to excessive loads, exceeding their load-bearing capacity, thus reducing the overall load-bearing performance of the slewing ring. For example, for a three-row cylindrical roller slewing ring subjected to a large axial load, a slight deviation in the parallelism of the mounting plane can result in an uneven distribution of axial forces, causing some rollers to experience much greater axial forces than others.

Working accuracy requirements of equipment: Different equipment has different requirements for the rotation accuracy of slewing rings, and the installation plane parallelism accuracy standard needs to meet the working accuracy requirements of the equipment. For example, in a high-precision CNC machining center, the rotary table is required to have extremely high rotation accuracy, which requires the mounting plane to have a high degree of parallelism to ensure the machining accuracy. In some construction machinery with relatively low precision requirements, the accuracy requirements of the parallelism of the installation plane can be appropriately relaxed.

Manufacturing and installation process level: The formulation of standards should consider the actual manufacturing and installation process level to ensure that the required accuracy can be achieved under the existing technical conditions. With the continuous progress of the manufacturing process, such as the emergence of high-precision processing equipment and the improvement of installation technology, the accuracy requirements of the parallelism of the installation plane can also be improved accordingly. For example, the use of advanced CNC machine tools to machine the mounting plane can achieve higher flatness and parallelism, thus providing technical support for the development of stricter accuracy standards.

Relevant industry standards and specifications: refer to the relevant industry standards and specifications at home and abroad, such as ISO, GB and other standards on the installation and accuracy of slewing rings, so that the formulated installation plane parallelism accuracy standards and the standards of the whole industry are coordinated and unified. For example, GB/T 307.1-2017 "Rolling bearings – Tolerances – Part 1: Radial bearings" has certain provisions on the accuracy requirements of the mounting surface of the bearing, and the accuracy standard of the mounting plane parallelism of the slewing ring can be formulated on this basis in combination with its own characteristics.

Three Row Cylindrical Roller Slewing Bearing Supplier

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