我厂改进了一种结构简单使用方便的机动攻丝保险夹头,解决了过去攻丝效率低、工具损坏多和不安全的现象。这一改进受到车间工人的欢迎,并且普遍用来加工不通孔螺纹,现将它的结构和操作方法简单介绍于下: 保险夹头的结构如图1。心轴1的尾部带有锥度与钻床相连,前端加工成顶尖状顶住丝攻,使丝攻的中心线和心轴似及钻床主轴同心。件7由螺钉16固定在本体14内,件7内孔与丝攻方 I plant to improve the structure of a simple and easy-to-use mobile tapping fuse chuck to solve the past tapping inefficiency, tool damage and unsafe phenomenon. This improvement is welcomed by workshop workers and is commonly used to machine non-through-hole threads. Its structure and operation are now briefly described below. The structure of the chuck is shown in Figure 1. The tail of mandrel 1 has a taper connected with the drilling machine, and the front end is processed into a top shape to withstand silk tapping so as to make the centerline of the tapping concentric with the mandrel and the drilling spindle. Piece 7 is fixed in the body 14 by a screw 16, piece 7 hole and silk attack side