气缸盖气门座密封锥面的加工,我们过去采用手铰。然而手铰工效低,劳动强度大。改用机铰后,合格率低。进一步分析后,发现胎具是一个影响加工质量的主要因素。原胎具存在下面几个问题:①胎具是用4个螺栓固定在台钻的底座上的,加工密封锥面时,胎具本身不能移动,气缸盖也就不能依靠胎具来找正;②胎具和台钻主轴的 Cylinder head valve seat sealing conical processing, we used to hand hinge. However, hand-hinge inefficient, labor-intensive. Switch to machine hinge, pass rate is low. After further analysis, found that the mold is a major factor affecting the quality of processing. The original tire has the following problems: ① The tire is fixed with four bolts on the base of the bench drill, processing sealing cone, the tire itself can not move, the cylinder head can not rely on the tire to find positive; ② tire and bench drill spindle