工件的母线不直度,有凸肚、凹肚、弯曲和波纹等。在加工细长工件时,如果机床——夹具——工件的刚性不足,就很容易产生这种偏差。而一般短小的工件,通常不会产生这种偏差,只有在无心磨床上加工时,导板或磨轮不正时,才会有凸肚、凹肚等情况。产生母线不直度差误的原因 The workpiece’s bus bar is not straight, with convex belly, concave belly, bending and ripples. This deviation can easily occur in the machining of elongated workpieces if the machine-tool-work-piece rigidity is not sufficient. The general short workpiece, usually does not produce this deviation, only in the centerless grinding machine processing, the guide plate or grinding wheel is not correct, there will be convex belly, concave belly and so on. Generate the cause of the bus is not straight