紧固螺纹除了能用铣削和滚压等方法加工外,在维修及小批生产中,普遍应用丝锥或圆板牙攻、套螺纹。在车床上加工螺纹,能达到中等精度,满足零件固定连接要求,操作方便,生产率较高,可一次加工成型。在车床加工螺纹必须有辅具。本文介绍能安装在车床尾座锥孔的键定位套叠式套丝夹头(图1),并以适用于M8～20套丝用的夹头的结 In addition to tightening the thread can be used milling and rolling methods such as processing, maintenance and small batch production, the general application of tap or disc teeth attack, set of thread. Machining threads in the lathe can achieve medium accuracy, meet the requirements of fixed parts connection, easy operation, high productivity, can be a molding. In the lathe machining thread must have aids. This article describes the key positioning telescopic lashing chuck (Figure 1) that can be mounted on a lathe tailstock taper hole. The knot for the M8-20 threading chuck