达吉斯坦工学院最近研制了一种高耐用度的复合丝锥。为了改进螺纹孔加工的导向,该丝锥由标准扩孔钻1和丝锥2组成,从而提高了加工精度。由于采用新的切削简图,故使丝锥能加工出优质的螺纹孔和具有很高的耐用度。按此简图缩短了丝锥切削刃的长度,即所留下的0.1～0.15毫米的倒棱,刚好超过切削厚度。 Dagestan Institute of Technology recently developed a high durability composite taps. In order to improve the guidance of the screw hole machining, the tap is composed of a standard reamer 1 and a tap 2, thereby improving the machining accuracy. Due to the new cutting diagram, the tap is made with high-quality threaded holes and has a high degree of durability. According to this sketch, the length of the tap cutting edge is shortened, ie the chamfer of 0.1 to 0.15 mm left is just over the thickness of the cut.