Correct Installation And Service Life Of Slewing Bearing

1.Proportional relationship between correct installation of slewing bearing and service life

As a precision rotating core component, the slewing bearing, the clearance value, the end runout, the axial runout and the radial runout, are all calculated by the wire and the track. It is very important to ensure the correct and precise installation of the bearing. Affect the service life and use effect of the bearing.

The design life of normal bearings is 20 years, and the service life is 10 years. Under the condition of ensuring accurate installation, correct use, maintenance and maintenance, the service life is about 10-12 years, and the heavy-duty bearing is about 5-8 years.

Notes on installation:

1. Ensure the rigidity and strength of the installation base surface, ensure that the stress is released completely, and the installation surface should be kept clean and the installation accuracy meets the relevant regulations.

2. Make sure that the mounting bolts are high-strength grade 10.9, the nuts are grade 10, the gaskets are quenched and tempered gaskets, the tolerances of the mounting holes of the bearings are within the normal range, and each joint surface should be cleaned to remove paint, iron filings, rust inhibitors, etc.

3. The seal is the lubrication system of the bearing. Check whether the seal is still in the correct position, and clean the fitting part of the mounting plane of the slewing bearing.

4. When connecting with high-strength bolts, pre-tighten the bolts: It should be pre-tightened in three steps, 30%, 80%, and 100%, respectively, to achieve the specified pre-tightening torque. In addition, check the fit of the slewing bearing and the mounting surface, usually with a feeler gauge. If the fit is not good, fill it with an appropriate material.

. It is strictly forbidden to weld the slewing bearing to avoid the deformation of the inner and outer rings, which will affect the normal use.

6. During installation, if the installation base surface is uneven, thin copper sheets can be prepared. If the installation plane is indeed installed, it should be considered to leave convex and concave shoulders or positioning blocks for radial positioning.

7. The tempering belts of the upper and lower raceways should be staggered by 180°. When installing crane and excavator turntable bearings, the tempering belt of the rolling ring should be placed at an angle of 90° with the direction of the boom, and the tempering belt of the rolling ring should be fixed. , should be placed in a location with less frequent work.

8. After the installation work, the raceways and gears should be filled with grease and regularly maintained.

9. Make sure that the gear meshing reaches 70% and the force is even.

2.Processing skills of precision slewing bearing

High-precision slewing bearing slewing bearings, especially emphasized, low height, thin wall thickness, many processes, and high precision requirements, such as heat treatment, tooth processing, drilling processes, all have an impact on the overall machining accuracy and quality control of the bearing, so what can be done? Woolen cloth?

In order to ensure both quality control and parameters, the formulated process needs to be particularly fine, and auxiliary tooling and even tire tools are essential.

First, understand the effect of heat treatment on deformation.

Secondly, the influence of tooth processing, tooth shaping, and grinding.

Bearing ground clearance, especially negative clearance.

Auxiliary tire tools, in heat treatment, finishing machining, gear shaping, gear grinding, grinding with end face and end runout, radial runout, common normal after grinding, and tooth runout parameters, all are the connection between the process and the process, and the precise control.

Therefore, for bearing design and selection calculation, the selection of working conditions must at least meet the requirements, and there will definitely be contradictions and errors.

For precision slewing bearings, understanding the manufacturing process is the key to knowing the performance of the bearing.