Date: 2013-08-20

Analysis of metamorphic formation of SKF roller bearing grinding process

Main factors influencing the grinding rolling bearing metamorphic are two-fold, namely the SKF bearing role of grinding force and grinding heat.
1, the grinding force
During the process of grinding workpiece surface layer will be grinding wheel cutting forces, the role of compression and friction. Role for the latter in particular, formation of the workpiece surface layer directional strong plastic deformation and machining of hardened layers. These degenerating layer must inevitably affect the change of residual stress in surface layer.
(1) cold plastic deformation
During the process of grinding, abrasive acts as the cutting edge of every moment. However, in many cases, a negative rake angle of the cutting edge, but the cutting effect of abrasive, is great for workpiece surface extrusion effect (no-tillage plow), clear plastic deformation of workpiece surface layer. This deformation layer varies with the degree of grinding blunt grinding feed and grow larger.
(2) hot plastic deformation (or high-temperature deformation)
Grinding hot on work surface to form the instantaneous temperature, workpiece surface layer elastic limit certain depth dropped dramatically, even up to the degree of loss of elasticity. Working surface in grinding forces at this time, especially under the action of compression and friction, cause freedom stretching, limited by base, the surface is compressed (plow), causing plastic deformation in the surface layer. High temperature plastic deformation in grinding the same cases, but increased the surface temperature of the workpiece.
(3) the work hardening layer
Method of hardness and metallographic assay can occasionally see, elevated surface layer hardness due to deformation.
2, grinding heat
In grinding, grinding wheel and the workpiece contact zone, can consume a large amount of, produce a lot of grinding heat, causing local instantaneous temperature of the grinding area. Using the theory of linear motion-heat-source heat transfer formula, calculation or the application of IR method under experimental conditions and method of thermocouple measuring instantaneous temperature, instantaneous temperature can be found in 0.1~0.001ms in the grinding zone can be as high as 1000~1500℃. Instantaneous temperature, sufficient to enable the work surface depth of high temperature oxide layer on the surface, non-crystalline, high-temperature tempering, quenching for the second time, or even burn crack and other changes.

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