图1为经过改进的在自动螺丝机床上高速切削奥氏体不锈钢螺纹的丝锥,它是在标准4槽丝锥(中锥)的基础上进行改进的。由于对丝锥结构的一系列改进,使丝锥的使用寿命由标准丝锥的2孔/每个丝锥提高到3000孔/每个丝锥。标准丝锥损坏的原因是:丝锥容屑槽被切屑堵塞,预钻底孔表面的加工硬化以及攻丝期间产生的过热。被加工零件如图2所示。 Figure 1 shows an improved high-speed cutting of austenitic stainless steel thread on an automatic screw machine, which is based on a standard 4-taps tap (center cone). Due to a series of improvements to the tap structure, the lifespan of the tap is increased from 2 holes per tap of a standard tap to 3000 holes per tap. The reason for the failure of a standard tap is that the chip flute is clogged with chips, pre-drilling the work-hole surface hardening and overheating during tapping. The machined parts are shown in Figure 2.