传统的空心丝锥一般采用图1所示结构,切削液进入丝锥端部后,通过横向孔喷出。由于该横向孔削弱了丝锥端部的抗扭能力,因而易于折断,特别是用M12以下的丝锥加工钢件时,可靠性很差,故不能采用空心结构。而日本的不二越工具事业部开发课开发的G型丝锥,采用图2所示结构,则可有效地克 Conventional hollow tap generally use the structure shown in Figure 1, cutting fluid into the tap end, through the lateral hole spray. Since the transverse hole weakens the torsion resistance of the end of the tap, it is easy to break, especially when the steel part is machined with a tap below M12, the reliability is poor, so the hollow structure can not be adopted. Japan’s Fujitsu Tools Division development of G-type tap developed using the structure shown in Figure 2, you can effectively g