By analysis of tooth profile of chain wheel machined with form milling cutter in our company, an improved design of form milling cutter and the application result after improved are introduced.

对我公司以往成形铣刀加工链轮齿形存在问题进行分析，介绍改进成形铣刀的设计及改进后的使用效果。

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According to the relative position of the rotor of the screw motor and the milling cutter, the coordinates of the helical tooth form and the cutter are-established.

根据螺杆钻具转子加工时与铣刀的相对位置，建立空间螺旋齿面坐标系和铣刀坐标系。

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