Investigation of belt-finishing effect on the residual stress field through repeated scratching on rough hard-turned surface

摘要

Belt-finishing process is renowned for its high capability to enhance surface integrity through scratching of the work-piece by means of multiple abrasive grains. In this work, the axial residual stress field induced by repeated scratch tests on an initial rough hard-turned surface is studied through numerical modeling. An analytical model is adopted to calculate the penetration depth and its evolution corresponding to the fixed indentation load and the number of scratching. The effect of the initial surface roughness, the loading conditions, the number of repeated scratching, and the coefficient of friction on the residual stress field, has been studied. The results show that whatever, the parameter's values, the affected layer doesn't exceed 11 mu m. Moreover, the best compressive residual stress field is obtained for the highest loading conditions, the lowest initial surface roughness and friction coefficient. The numerical results are then used as qualitative evidence to describe the residual stress field evolution during a belt-finishing process, and to propose an optimum solution, ensuring the highest surface integrity during such a process.