范成法切削齿轮时常用的梳刀和滚刀,在顶刃和侧刃之间都是以半径为R的圆角过渡的。R的大小不仅涉及到啮合时干涉与否,还影响轮齿和刀齿的强度和寿命,而目前讨论和推荐的R值又并不统一,因此,有必要进一步讨论。下面仅就避免啮合干涉和根切的条件来限制R可取的范围,从而确定合理的R值。 Fan Chengfa cutting combs and hobs commonly used in gear, the transition between the top edge and the side of the blade is a radius R of the fillet. The size of R not only involves the interference during engagement, but also affects the strength and life of gear teeth and teeth. However, the current values ​​of R discussed and recommended are not uniform, therefore, further discussion is needed. In the following, only the range of R desirable is limited with respect to the conditions of avoiding interference and undercut, so as to determine a reasonable R value.