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1The form of failure:
(1) The bearing is difficult to rotate and generates heat;
(2) The bearing operation has a strange sound;
(3) The bearing generates vibration;
(4) The inner race is peeled off and cracked;
(5) Exfoliation and cracking of the outer race;
(6) Indentation is produced in the bearing raceway and the rolling elements.
2Analysis of the cause of the failure:
(1) The inspection before assembly is not careful. Before the assembly, the bearing should be cleaned and carefully inspected for the inner and outer races, rolling elements and cages of the bearing, whether there are rust, burrs, bumps and cracks; check whether the bearing clearance is suitable. Is the rotation light and free, with or without sudden locking The phenomenon; at the same time check the size of the shaft diameter and housing hole, roundness and cylindricity and its surface is burr or four convex inequality. For the split bearing housing, between the bearing surface of the bearing cap and the bearing base and the outer circular surface of the outer race, a clearance of 0.1mm~0.25mm should be reserved to prevent the "waist" on both sides of the outer seat from being clipped. The gap caused by the phenomenon of “help” is reduced, the wear is accelerated, and the bearing is damaged prematurely.
(2) Improper assembly. Improper assembly can cause the bearing to have the various failure modes described above.