一、概述 我厂加工梯形螺纹TM20 × 4-M一套需四只丝锥,在钳台上加工至成品,要两个人轮换操作,劳动强度很大,单件工时需要30～40分钟,工件较长(L.=90毫米),容屑和排屑非常困难。要改善这种情况,必须增大容屑空间,这样又减小了丝锥的有效核径,致使丝锥的抗扭强度大大削弱,在加工 First, an overview of our factory processing trapezoidal thread TM20 × 4-M a set of four taps, to the finished product on the bench to two people to rotate operation, labor-intensive, single piece of work takes 30 to 40 minutes, the workpiece is more Long (L. = 90 mm), chip and chip removal is very difficult. To improve this situation, we must increase the chip space, which in turn reduces the effective tap diameter of the tap, resulting in tap strength greatly weakened in the processing