图1所示的顶尖孔需要用3把不同类型钻头进行加工,也就是说,在车床上加工需要装换3次钻头,因而很费时间。在大闹技术革命中,我们改进了一种三向钻孔工具,经实际使用证明,效果良好。工具构造如图2所示。1是主体,装在车床尾座上。2是钻座,用螺钉3、垫圈5、螺帽6固定在主体 The top hole shown in Figure 1 requires three different types of drill bits to be machined, which means that it takes time to replace the drill bit with three drill bits on the lathe. In the technical revolution, we improved a three-way drilling tools, the actual use of proven good results. Tool structure shown in Figure 2. 1 is the main body, mounted on the lathe tailstock. 2 is the drill seat, with screws 3, washers 5, nut 6 fixed to the main body