1引言我厂在拉削某零件的成形内花键孔时，当拉刀进入工件刚开始拉削时，即发生打环刀齿及门车现象。针对这一现象，我们进行了分析研究，认为该拉刀设计质量差是造成崩齿的主要原因。结合我厂拉削加工的具体情况，通过对原有的拉刀进行返修及设计新拉刀，较好地解决了我厂拉削 1 Introduction I plant in the shaping of a part of the internal spline hole, when the broach into the workpiece just started broaching, the occurrence of ring cutter and door car phenomenon. In response to this phenomenon, we conducted an analysis of the study that the quality of the broach design is the main reason for the collapse of teeth. Combined with the specific circumstances of our factory broaching, through the original broach for repair and design a new broach, a better solution to my factory broaching