通过构建几何模型，推导出蜗杆车刀头部的计算公式，简化了计算程序。
Via the construction of geometric model, calculation formula for the head of worm lathe tool has been deduced, which has simplified calculation program.
通常圆柱形蜗杆都是用成型车刀或铣刀加工，效率低而且齿形不易控制，质量也不易保证。
Cylindrical worms are usually worked by formed turning tool or milling cutter. It is inefficient. The tooth shape is difficult to control and the quality is not easy insured.
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