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Causes Of FAG Bearing Failure

wallpapers Industry 2020-11-19 PDF Format
According to the formation mechanism of the degraded layer of grinding on the working surface of FAG bearing, the main factors affecting the degraded layer of grinding are the effects of grinding heat and grinding force. Let's analyze the reasons for the failure of FAG bearings.
Deteriorated layer of FAG bearing
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 reaching the level of elasticity disappearing. At this time, the working surface layer is freely stretched under the action of grinding force, especially compression force and friction force, and the surface is compressed (more ploughed) by the limitation of the base metal, 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 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.
FAG bearings are widely used in steel, automobile, metallurgy, water conservancy, electric power, shipbuilding, petroleum, mining and other industries.

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