C 620-1B车床Ⅰ轴是第一根动力传递轴。由于车床经常启动,三角皮带轮花键孔经常磨损,造成与Ⅰ轴花键配合间隙过大,发生松动、影响车床精度及使用,每次大修时常因此而更换三角皮带轮,造成很大浪费。后来,我们采用更换花键套(45钢)的方法,将旧槽轮花键部位车掉,成图1形状,其花键套如图2, C 620-1B lathe Ⅰ axis is the first power transmission shaft. As the lathe is often started, the V-belt pulley spline hole often wear, resulting in the shaft with the I-axis clearance is too large, loosening, affecting the accuracy and use lathe, often because of the overhaul and replace the V-belt pulley, resulting in a great waste. Later, we used to replace the spline sleeve (45 steel) method, the old wheel spline car car off, into Figure 1 shape, the spline sleeve as shown in Figure 2,