To realized the parametric design of automobile synchronizer ring spline tooth efficiently, a method is presented in this article, which is realized based on the UG secondary development tools. The user environment settings and the establishment of the menu file and the human-computer interaction window are introduced in detail. The programming language is written to realize the parametric design of the spline tooth of synchronous ring. Application result shows that the method simplifies the synchronous ring modeling process and improves the working efficiency.

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