(1) fatigue spalling

Rolling bearing inner and outer raceway and rolling element bearing area, entry and exit alternately these parts for a long time under the effect of cyclic loading, the first from the contact surface to produce fatigue crack under cyclic shear stress biggest place, and then extended to contact surface dotted in surface spalling, gradually developed into large peeling, called fatigue spalling.

(2) the wear and tear

Due to the relative motion of the raceway and rolling body caused surface wear, dust and foreign bodies will aggravate wear and poor lubrication bearing clearance increases as a result, the surface roughness increases, reduces the bearing running accuracy, and thus reduce the movement precision of the machine, characterized by the increase of vibration and noise level.

(3) the scratch

Due to the contact surface of raceway and rolling element bearings inside and outside the microscopic bumps or hard particle on the interface is uneven, in bad lubrication, under the condition of high speed and heavy loading, due to the heat generated by the local friction contact local deformation and friction welded, serious when the surface of the metal may be the partial melting, contact surface forces from the local friction welding points on the matrix will be torn apart.

(4) fracture

When bearing the excessive load, vibration, inside and outside the circle of the defect position under the repeated impact roller, defects gradually expanded and fracture.

(5) corrosion

Water, acid or alkaline substances directly into will cause bearing corrosion. When bearing internal shaft current through, at the contact point of raceway and rolling body caused by edm and produce electric erosion, uneven washboard form is formed on the surface.