基于CATIA的一种端面驱动式机床夹具设计

Design of an End - Drive Jig Based On CATIA

目前轴类零件加工时使用普通卡盘采用“一夹一顶”方式装夹加工，该方法设计基准与工艺基准不重合，定位精度低，且一次走刀不能完成所有外圆面的加工，辅助装夹时间长，加工精度不稳定，效率低。因此，本文设计了一种采用两中心孔定位，端面驱动的新型机床夹具。四个端面驱动爪通过杠杆原理，根据驱动端面的“不平度”进行浮动，实现尺寸补偿，保证四个驱动爪提供的压力相等。该夹具可以缩短加工辅助时间60％以上，且设计基准与加工基准重合，加工完后各表面之间的相互位置精度高，具有良好的社会经济效益。本设计借助CATIA中的CAD和CAE相关模块完成，并对其工作状态进行了模拟与分析，为后续的改进设计提供了依据，提高了设计的效率。

The shaft parts processing using ordinary chuck？ machines in a clamp -clip way whose allocation accu- racy is low. And it cannot cut all the cylindrical surfaces by one step clamping, The auxiliary clamping time of which is long, machining precision is unstable and efficiency is low. Therefore, this article designs a kind of end - face driving new jig which allocate by two center hole. The four drive claws float according to the flatness of end - face by lever principle to implement dimension compensation, ensuring equal driving force. The jig reduce by auxiliary time more than 60%, improve the surfaces position precision after processing because of consistency of datum feature, that will produce social and economic benefits. The design is accomplished by CAD and CAE modules in CAT- IA. The working status is simulated and analyzed to provide the references for subsequent design which improve the efficiency of the design.