对旧机床进行针对性精化改装,使之能满足较高加工精度的要求,这在许多情况下比纯粹的更新设备更经济合理,而且容易实现。我厂生产的小钻头,外圆磨削加工全部采用无心磨削,并且用通磨—打料方法获得了钻头的倒锥,用大导轮倾斜角(粗、精磨都为3°～3.5°),加大了工件的进给速度。这两项措施,虽然提高了生产效率,却 Targeted refinement of older machines to meet the demands of higher machining accuracy is in many cases more economical and easier to implement than purely retrofit equipment. I plant production of small drill, cylindrical grinding all use centerless grinding, and through the grinding - hit the material obtained bit inverted cone, with a large guide wheel tilt angle (coarse, fine grinding are 3 ° ~ 3.5 °), increase the feed rate of the workpiece. These two measures, though raising the production efficiency, have