APPLIED MECHANICS IN GRINDING .4. THE MECHANISM OF GRINDING INDUCED PHASE-TRANSFORMATION

One of the most important problems in high precision grinding is the o ptimisation of the surface residual stress distribution of ground comp onents. It has been realised that the heat generated in the grinding z one plays a central role in the phase transformation of workmaterials that would alter the residual stress formation. The purpose of this pa per was to reveal the mechanism of phase transformation of workmateria ls induced by grinding. The finite element method was used to simulate the grinding processes. The heat source generated during grinding was considered as a moving heat flux with a triangular profile. Effects o f table speed, heat flux distribution, thermal properties of workmater ials and convective features of coolant were discussed in detail. It w as found that an optimal combination of grinding conditions could mini mise the depth of phase transformation. The results of this paper also offered essential information for the mechanism exploration of residu al stresses in ground components.