In the grinding process, the workpiece surface layer will be grinding wheel cutting force, the role of compression and friction. Especially for the latter role, the workpiece surface layer formed directional strong plastic deformation and hardening layers. These metamorphic layers must inevitably affect the changes of surface residual stress of FAG bearings.
(1) cold plastic deformation of layers
In the grinding process, every moment of wear particle is equivalent to a cutting edge. However, in many cases, before the cutting edge angle is negative, except for cutting role of wear particles, is to make the surface subjected to compression (plough), clear plastic deformation of workpiece surface layer. This deformation degree of deformation layer with the degree of grinding blunt grinding feed and grow larger.
(2) the FAG bearings hot plastic deformation (or high-temperature deformation)
Grinding heat work surface to form the instantaneous temperature, makes a certain depth of sharp decline in surface layer of elastic limit, or even the extent of the loss of elasticity. Work surface layer on grinding force at this time, especially under the effect of compression and friction, cause freedom stretch, subject to limitations as base metal, the surface is compressed (plow), in surface layer caused by plastic deformation. High temperature plastic deformation in grinding process of the same cases, increased with the rise in surface temperature.
(3) the FAG bearing machining of hardened layer
Sometimes micro-hardness and metallographic law can be found, due to deformation of the surface layer hardness up.
In addition to grinding, casting and heat treatment caused by surface decarburization layer, and then later in the process if they have been completely, were left in the workpiece surface will also result in softening the surface deterioration, leading to early failure of the bearing.
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