Based on the preshaving hob cutter spotal structure, authors analyse thecalcuiation two kinds of contact ratio on hob-shaving technology,and give the commutingformulae and examples.

• 基于剃前滚刀特殊结构，分析了滚-剃工艺下二种重合度的计算问题，给出了计算公式和实例。