Improper operation of precision bearings in installation often results in early damage of bearings or early failure in use.It greatly increases the bearing cost。
- Hammer strikes bearing directly
Install bearing with interference fit of inner ring (or outer ring). It is forbidden to use hammer to directly hit the end face of inner ring (or outer ring) of the bearing, so it is easy to break the guard edge.The sleeve should be placed on the end face of the inner ring (or outer ring) and installed by hammering the sleeve.
- Transfer the mounting force through the rolling body
When installing bearing with interference fit of inner ring, force cannot be transferred to inner ring through outer ring and rolling body.This will knock the bearing raceway and the surface of the rolling body, making the precision bearing produce noise and damage in advance when running.The correct method is to apply the force directly to the end face of the inner ring with a sleeve.
- Excessive heating temperature
Some users use acetylene spray gun to heat the inner hole of the bearing. When the heating temperature exceeds 727℃(the phase transformation temperature of bearing steel), the metallographic structure inside the bearing steel will change.When the bearing is cooled, the bearing inner hole cannot be restored to its original size, which is usually larger than the size before heating.Precision bearings are heated by an acetylene spray gun and the surface turns black.
- Inadequate installation causes force on single side of the KOYO bearing
One row of self-aligning roller bearings is stressed while the other row of rollers is not, so that the bearing inner ring and one side of the outer ring raceway and a row of rollers are damaged.
The installation method of aerospace bearings is a problem often encountered in the use of bearings, and it is also a problem that often has difficulties and troubles.Only by mastering the scientific and correct installation method can the bearing be used normally and the service life of the bearing be extended.