我厂试制的250型单体活塞环,内孔为椭圆形。以前我们在车床上,用机械夹具夹紧活塞环的内孔,用二把刀同时加工二端面。在加工过程中会产生振动,加工到半途工件会松掉,力再加大工件就会断裂。加工效率低,成品率只有三分之二。经研究,产生上述主要现象的原因是:由于活塞环内孔是椭圆形的,使用机械夹具夹紧内孔时,得不到均匀的夹紧力和接触面造成的。针对这个问题,我们设计了一种黄油的油压夹具(见附图),通过生产实践,消除了上述 I plant prototype 250-type single piston ring, the hole is oval. In the past we used the lathe to clamp the inner bore of the piston ring with a mechanical clamp and simultaneously process the two ends with two knives. In the process of vibration will produce, halfway to the workpiece will be loosened, the force will increase the workpiece will break. Low processing efficiency, yield rate of only two-thirds. After the study, the main reason for the above phenomenon is that, because the inner hole of the piston ring is oval, the uniform clamping force and the contact surface can not be obtained when using the mechanical fixture to clamp the inner hole. In response to this problem, we have designed a butter hydraulic clamp (see photo), through the production practice, eliminating the above