梯形螺纹大概是各种螺纹加工中最困难的一种。该工序的丝锥设计和制造存在着各种问题,而这些问题在普通工程实践中是不常碰到的。设汁和制造令人满意的梯形螺纹丝锥的主要困难在于,为了形成螺纹,丝锥必须从孔内切除大量的金属。在切削时,丝锥扭转应力是十分大的,如果设计、制造程序及应用方法不完全正确,那么丝锥断裂会十分容易发生。设计的第一步,是决定每齿的允许切深量,根据每齿切深和已知螺母要求的螺纹深度, Trapezoidal thread is probably the most difficult of all kinds of thread processing. There are various problems with the design and manufacture of taps in this process, and these problems are not commonly encountered in common engineering practice. The main difficulty in setting up and making a satisfactory trapezoidal thread tap is that the tap must cut a large amount of metal from the hole in order to form a thread. In cutting, tap torsional stress is very large, if the design, manufacturing process and application of the method is not entirely correct, then the tap fracture will be very easy to happen. The first step in the design is to determine the allowable depth of cut for each tooth. Depending on the depth of cut per tooth and the thread depth required for the known nut,