Abstract
In grind‐hardening the heat generated by a grinding process is utilized for a surface layer hardening of steel workpieces. In the present work the causes of distortion and its possible compensation were analyzed for single‐side and double‐sided grind‐hardened prismatic workpieces made of 90MnCrV8 (AISI O2). The results show that an increase of the feed speed reduces the resulting martensitic surface layer thickness whereas the influence of the residual tensile stresses on the workpiece distortion increases. Also, shape changes caused in single‐side grind‐hardening significantly depend on the shape deviations prior to grind‐hardening. Moreover, it was not possible to compensate workpiece distortion by a subsequent grind‐hardening of opposite sides of the workpiece although the same grinding parameters were used. It is assumed that the stresses state of the clamped workpieces supports the generation of residual tensile stresses and/or reduces the generation of residual compressive stresses in the martensitic surface layer.
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