Study on impacting hardening mechanism and model of pre-stressed hardening grinding

Abstract

Pre-stressed hardening grinding (PSHG) can control the residual stress after grinding, and its surface layer has impacting hardening (IH) effect besides the well-known quenching hardening effect due to the impact of abrasive grain. In order to study its IH, the paper established the IH model of PSHG using ANSYS simulation method considering the main factors of grinding impacting. The IH characteristic and mechanism was revealed. The IH effect mainly concentrates on the surface layer and reduces rapidly along the direction of depth. It increases with the increase of pre-stress and the grinding depth due to their comprehensive promotion of dislocation, dynamic recovery of crystal grain and motion characteristic of the iron atom. The IH experiment of PSHG was carried on and the simulation model was verified by and large. The model can reveal the IH characteristic accurately.