Study of PSHG and its integrated hardening model of hardening layer

摘要

Pre-stressed hardening grinding (PSHG) combines with the advantage of grinding hardening and pre-stressed grinding. Ideal residual stress can be obtained along with the hardening effect on the surface of workpiece. In order to study its unique hardening characteristic, the paper divided the comprehensive hardening effect of PSHG into quench-hardening effect and work-hardening effect. Combining with the PSHG experiment, the quench hardening rules and mechanism were studied. The stabilization of parent phase and dislocation-induced nucleation due to applying pre-stress has comprehensive effect on the martensite transformation. So, the quench-hardening effect increases first and then decreases with the increasing of pre-stress. From the perspective of energy transformation, a model of quench hardening was established which can describe its relation with pre-stress in PSHG. The mechanism of the work hardening was analyzed. And a simulation model was established using ANSYS which can describe the relation between work-hardening effect and the pre-stress. It reveals the pre-stress restrains the work-hardening effect due to its influence on dislocation of surface materials, especially when the depth of cut is small.