提高磨削效率的方法之一,就是减少空行程时间。即是使砂轮开始作快速送进,在即将触及工件时转为磨削进给。为此,对砂轮与工件的接触检测采用了下列一些方法:检测砂轮接触工件时砂轮电机输入功率的变化;直接检测砂轮回转时的力矩变化;检测接触振动或磨削噪音等等。但是,这些手段都是在砂轮切入工件后才进行检测。如果在砂轮即将触及 One of the ways to improve the grinding efficiency is to reduce the empty travel time. That is, the grinding wheel starts to be fed in quickly, and the grinding feed is changed immediately before the workpiece is touched. To this end, the wheel and the workpiece contact detection using the following methods: Detection of wheel contact with the workpiece when the wheel motor input power changes; direct detection of wheel rotation torque changes; detection of contact vibration or grinding noise and so on. However, these measures are carried out after the wheel is cut into the workpiece. If the wheel is about to touch