我厂产品零件套筒（见图1）两端均有台阶孔，且具有较高的尺寸精度和同轴度要求。原工艺在通用车床上先加工一端台阶孔，调头再加工另一端。这种方法对操作者的技术水平要求较高，且工效低，不能满足生产的要求，为此设计制造了车削台阶孔的专机。专机利用C320车床的零件及部分 I plant products parts sleeve (see Figure 1) both ends of step holes, and has high dimensional accuracy and concentricity requirements. The original process in general-purpose lathe first processing step hole, turn head and then processing the other end. This method requires high technical level of the operator, and low work efficiency, can not meet the requirements of production, for which a special machine for turning a step hole is designed and manufactured. Special plane using C320 lathe parts and parts