滚刀、插齿刀设计成较大的修缘角，有利于提高啮合质量。
Designing of external gear shaper cutter with large tip relief Angle can improve the meshing quality.
把修缘角外插齿刀的设计归结为一个双目标的优化问题，建立了优化设计的数学模型。
This paper concludes the designing of the external tooth shaping cutter for tooth tip relief as a double-aimed optimization problem and proposes a mathematic model of optimum design.
推导了进入双点啮合区的法面啮合角公式，采取了独特的剃齿刀修形方式，从设计和修形上下功夫杜绝剃齿中凹的产生。
And the normal engagement angle of approaching double-point tooth area is deduced. The special dressing method of shaving cutter has been adopted.
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