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FAG precision bearings Metamorphic layers formed by grinding forces.

933 Published by Oct 26,2018

FAG precision bearings Metamorphic layers formed by grinding forces
During the grinding of FAG precision bearings, the surface layer of the workpiece will be affected by the cutting force, compressive force and friction of the grinding wheel. In particular, the latter two functions to form a plastic deformation layer and a work hardened layer having a strong directivity on the surface layer of the workpiece. These metamorphic layers necessarily affect the change in the residual stress of the surface layer.
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Cold plastic deformation layer of FAG precision bearings
In the grinding process, each abrasive grain is equivalent to a cutting edge. However, in many cases, the rake angle of the cutting edge is a negative value. In addition to the cutting action, the abrasive grain is subjected to the pressing action (the effect of the plough), leaving a significant plastic deformation layer on the surface of the workpiece. The degree of deformation of such a deformed layer will increase as the grinding wheel is blunt and the grinding feed increases.

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FAG precision bearings thermoplastic deformation (or high temperature deformation) layer
The instantaneous temperature of the grinding heat on the working surface causes the elastic limit of the surface layer of the workpiece to drop sharply at a certain depth, even to the extent that the elasticity disappears. At this time, under the action of the grinding force, especially the compressive force and the frictional force, the free stretching of the working surface layer is restricted by the base metal, and the surface is compressed (more plowed), causing plastic deformation in the surface layer. The high temperature plastic deformation increases with the surface temperature of the workpiece under the condition that the grinding process is constant.

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FAG precision bearings work hardened layer
It is sometimes found by the microhardness method and the metallographic method that the hardness of the surface layer is increased due to the processing deformation.
In addition to the grinding process, the surface decarburization layer caused by casting and heat treatment heating, if not completely removed in the subsequent processing, will remain on the surface of the workpiece and will cause surface softening and deterioration, leading to the early failure of FAG precision bearings.

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