在难加工材料的切削加工中,攻丝是最困难的工艺之一。这是因为要用丝锥在坯孔上加工出螺纹,作为刀具的丝锥是在非常狭小的空间既要完成切削任务,叉要排除切屑,其工作条件是很恶劣的。各种难加工材料,其性能各异,切削加工的特点也差别极大。因而,要想使用某种“万能”丝锥解决全部问题,那将是徒劳的。只能针对不同的被加工材料特性选用和设计不同的丝锥,才能取得满意的效果。 Tapping is one of the most difficult processes in the machining of difficult-to-machine materials. This is because it is necessary to tap the tap hole in the processing of the thread, as a tool of the tap is in a very small space both to complete the cutting task, fork to rule out the chip, the working conditions are very poor. A variety of difficult materials, their performance varies, the characteristics of cutting vary greatly. Thus, it would be futile to use a “universal” tap to solve all the problems. Only for different characteristics of the processed material selection and design of different taps in order to obtain satisfactory results.