柴油发动机轮系中的曲轴正时齿轮，为了装配调试方便，一般都需要在齿形端部打上正时标记，如图 1所示。为了保证正时记号的位置要求，我们尝试了两种方法： 1)拉键槽→滚齿→打正时标记。此方法生产效率低，加工精度也不高； 2)滚齿→打正时标记→拉削键槽。该方法只要设计适? The crankshaft timing gear in the diesel engine gear train is usually marked with a timing mark on the end of the tooth for assembly and debugging convenience as shown in FIG. 1. In order to ensure the position of the timing mark requirements, we have tried two ways: 1) pull the keyway hobbing tooth timing mark. This method of low productivity, processing accuracy is not high; 2) hobbing → timing mark → broaching keyway. This method as long as the design is appropriate?