Study on Surface Finish Mechanism in Quick-Point Grinding

摘要

In quick-point grinding, the thin super abrasive grinding wheel and CNC technology are applied, and the contact zone is nearly a point between the wheel and workpiece. Because of the point-grinding angles, the grinding model of the process is different from that of the conventional cylindrical grinding. The contact width between the wheel edge and the workpiece is not always equal to the thickness of the wheel, and the effect of the plastic plough on surface integrity is enhanced due to the lower grain depth of cut. In this paper, the edge contact layer model and the parameters are presented, and the formula and simulations for the edge contact width are given. Based on the experiments of grinding steel with single grit at high speeds, the effects of grain depth of cut and grinding speed on the plastic upheaval and the height of valley bottom on ground surface profile are analysed. Furthermore, the formula to calculate ground surface roughness is established considering the real edge contact width and plastic plough deformation.