In the INA Bearings grinding process, the surface layer of the workpiece will be subject to the cutting force of the grinding wheel, the compression force and the frictional force. Especially the role of the latter two, so that the surface layer of the workpiece to form a highly directional plastically deformable layer and the hardened layer. These metamorphic layer will inevitably affect the change of the residual stress of the surface layer.
(1) cold plastic deformation layer
Every moment abrasive in the INA Bearing grinding process, the equivalent of a cutting edge. However, in many cases, the rake angle of the cutting edge is negative, the abrasive grains in addition to the cutting action, so that the workpiece surface to withstand squeezing action (Plough role), the surface of the workpiece to leave a significant plastic deformation layer. This the degree of deformation of the deformable layer is increased feed amount increases with the extent and bearing grinding grinding blunt.
(2) a thermoplastic deformation (or a layer of high temperature deformation)
The elastic limit of the instantaneous temperature of the INA bearing grinding heat is formed in the work surface, so that a certain depth of the surface layer of the workpiece is a sharp decline, even to the extent of elasticity disappears. The work surface layer in the the bearing grinding force, particularly compression force and friction caused by stretching freely, subject to the limitations of the matrix metal, the surface is compressed (plow), causing plastic deformation in the surface layer. The high temperature plastic deformation in bearing grinding process is the same, the increase of temperature increases with the surface of the workpiece.
(3) hardening of the layer
Sometimes with the the microhardness method and metallographic method can be found, due to rises the machining distortion caused by the hardness of the surface layer.
In addition to the INA bearing grinding, casting and heat treatment caused by heating the surface decarburization, and then subsequent processing if it is not completely ideas, and the residue on the workpiece surface will cause the deterioration of the surface softening, contribute to the early failure of the bearings.



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