Abstract
Parametric design is one of reliable and effective modern mechanical design technologies. The process of 3D parametric design system of worm gear was developed to aim directly the character of worm drive. Establishment of CAD model of worm gear, design and calculation of parameters of worm drive and the output of design documents and drawings were solved based on the secondary development for Pro/E. Then a relative example is given to prove its feasibility and efficiency. The operation result show design efficiency of worm gear is enhanced greatly by using this 3D parametric design system, which meets the needs of modern mechanical design. This study also provides a reference to 3D parametric design for other parts.
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