我厂工具车间丁述炳等同志,改进了一种工具,用来夹持丝锥,以便在车床上进行加工。这工具的结构如附图,图中1是退拔套筒,可与车床主轴配合。2是顶尖,退拔部分装在套筒1内;中部车有螺纹,并开有一条键槽。3是背帽,旋在件2的螺纹部分上。4是垫圈,内圆要比件2的螺纹部分略大;内圆上凸出一个键,与件2上的键槽配 Ding Shuibing tools workshop I and other comrades to improve a tool for clamping taps for lathe processing. The structure of this tool is shown in the accompanying drawings. In the figure, 1 is a withdrawing sleeve which can be matched with a lathe spindle. 2 is the top, pulled back part of the sleeve 1; middle car thread, and opened a keyway. 3 is a cap, screwed on the threaded part of the piece 2. 4 is a washer, the inner circle is slightly larger than the threaded portion of the part 2; a key is projected on the inner circle, and the keyway on the part 2