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連杆是发动机的典型零件,它在发动机的工作行程中,将活塞的膨胀气体压力传給曲軸,承受接近冲击性質的动負荷。它的技术要求較高,大小头孔精鏜工序一般均放在金刚石鏜床上进行。在精鏜小头底孔及小头衬套孔时,为保証大小头孔中心距和中心綫不平行度允差及中心綫不歪曲度允差,一般均以大头孔来定位。目前应用較广的是液性塑料心軸。应用液性塑料心軸的关鍵要求是:定位准确,重复定位精度
The connecting rod is a typical part of the engine that transmits the pressure of the expanding gas of the piston to the crankshaft during the working stroke of the engine to withstand dynamic loads close to the impact. Its high technical requirements, the size of the first hole fine boring process are generally placed on the diamond boring machine. In the fine boring small head bottom hole and the head bushing hole, in order to ensure the size of head hole center and center line of non-parallel tolerance and the centerline is not skewed tolerance, generally are big hole to locate. Currently widely used is the liquid plastic mandrel. The key requirements of liquid plastic mandrels are: accurate positioning, repeat positioning accuracy