我厂是生产汽车半轴的专业企业，汽车半轴在车加工前需钻两端中心孔，然后再以中心孔定位加工其它部位，为了保证中心孔能钻在轴端面的中心上，我们设计了这一自定心钻中心孔夹具 (如图所示 )，通过使用效果较好。 此夹具利用正、反螺纹同步进退原理设计而成，操作时先将夹具安 I plant is the production of automotive semi-axis of the professional enterprises, car semi-axle in the car before processing drilling both ends of the center hole, and then the center hole positioning processing of other parts, in order to ensure that the center hole can be drilled in the shaft end of the center, we design This self-centering hole drilling fixture (as shown), through the use of better. The use of positive and negative anti-threaded advance and retreat principles designed, the first operation of the fixture