Aiming at the approximate entity modeling shortcomings of worm helical teeth shape, this paper narrates in detail the entity modeling process of worm teeth shape by the method of creating drawing plane; according to this way the precise information can be provided and dynamic imitation of machine as well as finite element analysis can be supported well.%本文针对蜗杆螺旋齿形近似实体建模的不足，通过构造蜗杆齿形绘制平面的方法，详细叙述了蜗杆齿形实体建模过程；按照这种方法建模的实体能提供精确信息、更好地支持机构动态仿真和有限元分析。
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