1. A metamorphic layer formed by grinding force. During the grinding process, the surface layer of the workpiece will be subjected to 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.
2. The secondary quenching burn will cause the surface layer stress of the nsk bearing workpiece to change. The secondary quenching zone is under pressure, and the material in the high temperature tempering zone below it has the largest tensile stress, which is the place where the crack core is most likely to occur. Cracks are most likely to propagate along the original austenite grain boundaries. Severe burns can cause cracks in the entire grinding surface (more cracking) and scrap the workpiece.
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