我厂在C1325单轴六角自动车床上加工如图1所示的薄壁有色金属零件,用M11×0.5的普通板牙套丝时,经常产生螺纹外径拉小,螺纹中径不稳定或工件前端开裂、扭断等现象,造成大量零件报废。我们经过多次切削试验证明,普通板牙存在前角小,切削刃瓣太宽,校正齿多,而且在板牙退出工件时有可能再次参加切削拉毛工件,这些缺点对在自动车床上加工薄 I plant in the C1325 single-axis hexagonal automatic lathe machining shown in Figure 1, the thin-walled non-ferrous metal parts, with M11 × 0.5 ordinary die set threading, the thread diameter is often small pull out, the thread diameter is unstable or the front end of the workpiece Cracking, twisting and other phenomena, resulting in a large number of parts scrapped. After several cutting experiments, we have proved that there are small rake angles, cutting edges and flanks are too wide and the correction teeth are too large. In addition, it is possible to participate in the cutting and blanking work again when the die is withdrawn from the workpiece.