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Causes of bearing failure

2020-10-10

In the case of bearing failure, we have summarized some possible reasons for bearing failure according to some situations, mainly due to the following reasons.

Deteriorated layer of bearing due to grinding force

In the grinding process, the surface layer of the workpiece will be affected by the cutting force, compression force and friction force of the grinding wheel. Especially the effect of the latter two makes the surface layer of the workpiece form a highly directional plastic deformation layer and a work hardening layer. These metamorphic layers inevitably affect the changes in the residual stress of the surface layer.

(1) Cold plastic deformation layer

In the grinding process, every tick is equivalent to a cutting edge. However, in many cases, the rake angle of the cutting edge is negative. In addition to the cutting action, the abrasive particles are subjected to the squeezing action (plough action) on the surface of the workpiece, leaving an obvious plastic deformation layer on the surface of the workpiece. The degree of deformation of this deformation layer will increase with the degree of blunt grinding of the grinding wheel and the increase of the grinding feed.

(2) Thermoplastic deformation (or high temperature deformation) layer

The instantaneous temperature formed by the grinding heat on the working surface makes the elastic limit of the surface layer of the workpiece at a certain depth drop sharply, even to the extent that the elasticity disappears. At this time, the working surface layer is freely stretched under the action of grinding force, especially compression force and friction force, and is restricted by the base metal, the surface is compressed (more ploughed), causing plastic deformation in the surface layer. The high-temperature plastic deformation increases with the increase of the surface temperature of the workpiece under the condition of the same grinding process.

(3) Work hardened layer

Sometimes microhardness and metallographic methods can be used to find that the hardness of the surface layer increased due to processing deformation.

In addition to grinding processing, the surface decarburization layer caused by casting and heat treatment heating, if it is not completely removed during subsequent processing, remains on the surface of the workpiece will also cause surface softening and deterioration, leading to early bearing failure.

Add:No. 008 Zhujiangdong Road, Linxi County, Xingtai City, Hebei Province
Phone:13833905637   Tel:0319-8560377
Contact:Mr. Wang   Email:596931418@qq.com
Website:www.hsyl-zc.com

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