1. Wear failure

Wear failure refers to the failure caused by the continuous wear of metal on the working surface, caused by the relative sliding friction between the surfaces.

Continuous wear will lead to the gradual damage of bearing parts, and eventually lead to the loss of bearing dimensional accuracy and other problems.

Wear failure is one of the common failure modes of all kinds of bearings, which can be divided into abrasive wear and adhesive wear according to the wear form.

Abrasive wear refers to the wear caused by extrusion of external hard particles or hard foreign bodies or metal surfaces between the working surfaces of bearings and relative movement of contact surfaces, which often cause ploughing scratches on the working surface of bearings.

Adhesive wear refers to the uneven force on the friction surface caused by the microprotruding of the friction surface or the foreign body. When the lubrication conditions deteriorate seriously, the local deformation of the friction surface and the phenomenon of friction micro-welding are easy to be caused by the local friction and heat generation.

When the surface metal is serious, the surface metal may melt locally, and the force on the contact surface will tear the local friction welding joint from the matrix and increase the plastic deformation.

2. Clearance variation failure

In the work of rolling bearing, due to the influence of external or internal factors, the original fit clearance is changed, the accuracy is reduced, and even the "bite death" is caused, which is called clearance change failure.

Such as excessive interference, inadequate installation, expansion caused by temperature rise, instantaneous overload, and internal factors such as retained Austenite and residual stress in unstable state are the main causes of clearance change and failure.