加工长轴,一般常用的工艺方法是在中心架支承下先钻中心孔,如图1所示。但是由于毛坯材料的圆度较差,而且表面非常粗糙,因此,在旋转时中心架三个支承面极易磨损,同时又有剧烈的跳动。另外,因毛坯材料都有不同程度的弯曲,在选择中心孔位置时,应考虑弯曲情况,避免切削余量集 Processing long axis, the commonly used method is to drill the center hole in the center frame support, as shown in Figure 1. However, due to the poor roundness of the rough material and the very rough surface, the three support surfaces of the center frame are easily abraded with sharp beatings during rotation. In addition, the blank material has varying degrees of bending, the choice of the location of the center hole, bending should be considered to avoid cutting margin set