柴油发动机齿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所示零件,其位置要求是比较高的,要保证定时记号的位置要求,我们尝试了两种方法,一是拉键槽滚齿打正时标记,这种方法生产效率不高,加工精度也不高;二是滚齿打正时标记?.. Crankshaft timing gear in diesel engine gear train, in order to facilitate assembly and debugging, generally need to mark the end of the toothed timing, as shown in Figure 1 parts, the location requirements are relatively high, to ensure that the timing mark position Requirements, we have tried two methods, one is the key slot  hobbing  hit the timing mark, this method is not productive, processing accuracy is not high; Second, the hobbing 正 hit the time mark ?