介绍了硬齿面滚刀倒棱的齿形计算公式和误差分析，探讨了新型的倒棱滚刀结构方式及制造工艺。
Profile formula for hard gear chamfered edge hob and its error analysis are introduced. A new kind of chamfered edge hob structure and manufacturing engineering are investigated.
目的观察自行设计的微棱形针刀治疗枕大神经、枕小神经卡压性头痛的疗效。
Objective To observe the effect of microprismatic needle scalpel(MPNS) on headache induced by compression of greater occipital nerve or lesser occipital nerve.
滚削蜗轮时，其齿侧面为滚刀切削刃在一系列不同位置的包络面，因而不可避免地要产生棱面。
The surface of worm gear is formed by the different positions of worm wheel hob generated as machining. So prisms are inevitably produced.
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