体积和重量较大的工件,在加工内孔链槽之前,都需要经过繁重的找正和划线工作。全国社会主义建设积极份子刘树新同志针对这种情况,制造了一个专用工具,采用这种工具不仅可以去掉找正和划线工序,而且还保证了键槽两边界限跟轴心线的对称要求。工具的结构:如图1所示。它是由冲头1、靠板2和螺钉组成。冲头1下端尺寸跟键槽尺寸大小相同,上部形状类似于手铲。靠板2是用管子做成的,半圆形 Large volume and weight of the workpiece, before processing the inner hole chain groove, need to go through heavy work of alignment and marking. In response to this situation, Comrade Liu Shuxin, an activist in socialist national construction, has created a special tool that not only eliminates the need for alignment and scribing processes, but also ensures the symmetry between the two sides of the keyway and the axis. Structure of the tool: As shown in Figure 1. It consists of punch 1, plate 2 and screws. The size of the lower end of the punch 1 is the same as that of the key groove, and the shape of the upper part is similar to that of a hand shovel. Rectangle 2 is made of pipe, semi-circular