Rolling bearing is a precise mechanical component that changes the rolling friction between the running shaft and the shaft seat into rolling friction so as to reduce the energy loss. Rolling bearings are generally composed of an inner hole, an outer ring, a rolling body and a cage. The role of the inner hole is to cooperate with the shaft and rotate with the shaft; The effect of the outer ring is to cooperate with the bearing with seat and play a driving role; The rolling body is evenly spread between the inner ring and the outer ring by the cage. The total size of the rolling body directly affects the performance index and service life of the rolling bearing. The cage can make the rolling body joint distribution, correctly guide the rolling body rotation to play the role of lubrication.

In the use of rolling bearings, there are many ways to cause invalid rolling bearings. In the daily use of rolling bearings, there are mainly three kinds of common invalid forms: fatigue, shape change and abrasive wear. For these three invalid forms of rolling bearings, the Chinese bearing net is described in detail as follows.

1. Fatigue: For rotating rolling bearings, fatigue pitting is the key ineffective form, so it is mainly to carry out service life calculation, if it is necessary to do static stiffness calculation.

2. Shape change: For rolling bearings with no rotation, low rotation or sloshing, partial molding variation is the main ineffective form, so it is mainly to carry out static strength measurement.

3. Abrasive wear: For high-speed bearings, hot plywood is the key ineffective form, so in addition to carrying out service life measurement, the limit speed should be checked.