再次，根据经典接触力学中的赫兹理论推导了双压力角非对称齿轮的齿面接触应力计算公式；
Thirdly, the contact stress equations of asymmetric gear with two pressure angles are derived by the Hertz theory of classical contact mechanics.
不对称双角铣刀用来铣削角度槽、斜面及螺旋沟、台阶面。
Asymmetric dual-angle milling cutter used to point chutes, and inclined spiral groove, level surface.
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