一、引言准确地检测出砂轮和工件的初始接触时间，对于磨削加工，尤其是超精密磨削加工中的尺寸控制、加工效率，以及砂轮与工件的保护等都是非常重要的。曾经有人通过振动加速度信号的变化、电机负载电流的变化以及涂料的变化来检测砂轮与工件的初始接触状况，操作人员往往借 I. INTRODUCTION It is very important to accurately detect the initial contact time between the grinding wheel and the workpiece for the size control, processing efficiency, and the protection of the grinding wheel and the workpiece in the grinding process, especially the ultra-precision grinding process. Someone once through vibration acceleration signal changes, changes in motor load current and paint changes to detect the wheel and the initial contact with the workpiece, the operator often borrow