Bearing is one of the necessary parts of machine, which is widely used in modern industry. What people called “joints of the machine”, an important drive disk assembly, which need bear axial and radial load turning torque at same time. According to damage appearance, the reason is below:

1. Lifted metal of Race way surface

Roller, inner and outer ring withstand Cyclic pulsation load, therefore cause a cyclic contact force.

When cyclic force reach to certainly times, on the contact surface of the roller and raceway will appear lifted metal. The load is bigger, the appearance will be more obvious. On the other hand, non-correct assemble, bend shaft will also cause lifted metal. Lifted metal will reduce the running accuracy of the shaft, and make noise and vibration.

2. Bearing burn

The burned bearing has its rollers and the rolling body has a temper color. The cause of the burn is usually insufficient lubrication, the quality of the lubricating oil does not meet the requirement or deterioration, and the bearing assembly is too tight.

3. Plastic deformation

The bearing roller has an uneven pit on the contact surface of the roller, and it is said that the bearing appear plastic deformation. The reason is bearing under static load or shock loading, local stress exceeds the yield limit of material on the surface of the work, this kind of situation usually happened in the low-speed rotation of the bearing.

4. Crack of the bearing ring

Crack of the bearing race may be bearing fit tight, loose shaft bearing outer ring and inner ring, bearing deformation, inclusive of installation of bearing surface processing etc.

5. Cage broken

The reason is that the lubrication is insufficient, the rolling body is broken, the seat ring is askew. The reason that the metal adhered to the shelf may be caused by rolling is stuck in the shelf or not. The serious wear and tear of the seat ring may be in the socket, which is not suitable for lubricating oil or lubricants.