我厂过去加工环头螺钉,是在四爪卡盘上将工件夹紧后进行的;由于要在卡爪上加块,并且要花很长时间来找正,所以生产效率很低。后来改进了如图甲的简单工具,即做一个套筒,在一端按工件圆弧开一个弧形槽口;利用这工具来加工环头螺钉,可以节省装夹和校正的辅助时间。工作时:将这工具夹在车头 Our factory in the past processing ring head screws, jaws in the four-jaw clamping the workpiece after the work; due to add a block on the jaws, and take a long time to find positive, so the production efficiency is very low. Later, the simple tool of Figure A was improved. That is to say, a sleeve was made, and an arc notch was made on the arc of the workpiece at one end. By using this tool to process the ring head screw, the auxiliary time for clamping and correction can be saved. Work: clip this tool in the front