一、问题的提出1.我厂为第二汽车制造厂配套的专用端面外圆磨床H179的砂轮架要求分二次不同位置的进给,二次位置的间距仅相差6.77mm,要求较高的重复停位精度(0.005mm)并且要求长时间使用不出误差。2.我厂惯用的跳档拨销油缸变位、销定的方式,机械、电气、液压元件多,传动链长, First, the issue put forward 1. I plant for the second automobile factory supporting special end surface grinder H179 wheel frame requires sub-two different positions of the feed, the second position only a difference of 6.77mm spacing, requiring a higher Repeated stop accuracy (0.005mm) and requires long time use without error. 2. I used the factory stalls Dingchiao cylinder displacement, the pin set way, mechanical, electrical, hydraulic components, drive chain length,