左、右曲柄是自行车机加零件中工时最集中的零件。在各专业厂,这两个零件都是在专门车间中生产,且绝大部分是每道工序用一台专机加工。因而专机数量多,零件周转次数少、路线长。我们在学习兄弟厂经验的基础上,结合我厂实际情况,设计了左、右曲柄通用孔加工组合机床,用一种型号的设备完成两种曲柄全部孔加工(攻丝除外)工序。实现了一机多用,简化了工艺过程和专 The left and right cranks are the most concentrated parts of a bike’s machined parts. In the professional factory, these two parts are produced in a special workshop, and the vast majority of each process with a special machine processing. Thus the number of special aircraft, spare parts turnover less, long route. Based on the experience of our brother factory and the actual situation of our factory, we have designed the universal drilling and machining machine combined with left and right cranks and completed the machining of all holes (excluding tapping) of the two cranks with one type of equipment. To achieve a multi-purpose machine, simplifying the process and expertise