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在普通车床上加工两端带有中心孔的轴类工件,一般是在床头主轴孔内放置一标准顶尖,采用两顶尖方法加工,其轴向长度尺寸很难掌握。为了控制轴向尺寸,将原车床顶尖作如图改进。加工时,工件以两顶尖定位,继续前进昆架,直到工件一端面与定位套平面接触,这时停止尾架前进。加工一端台阶尺寸后调头,仍以两顶尖定位,前进尾架,使工件左端与定位套平面接触。在这一过程中,滑动顶尖克服弹簧力而轴向移动,直到与工件左端接触为止,弹簧的 k 值不能太
In the ordinary lathe machining both ends of the center hole with the axis of the workpiece, usually in the bed head spindle hole to place a standard top, using two top methods of processing, the axial length of the size is difficult to grasp. In order to control the axial size, the original lathe as the top figure improved. Processing, the workpiece positioning to the top of the two, continue to advance Kun frame until the workpiece one end face and positioning sleeve plane contact, then stop the tailstock forward. After processing one end of the step size and turn around, still two top positioning, advance the tailstock, so that the left side of the workpiece and positioning sleeve plane contact. In this process, the sliding tip overcomes the force of the spring and moves axially until the left end of the workpiece contacts, the value of the spring k can not be too