In order to address the inaccuracy of double lead worm gear modeling,according to the working principle and manufacturing process of the double lead worm gear,the contact line between the cutting tool and worm gear is used to form the spiral line and the spiral face and generate accurate worm tooth profiles.Then the conjugate gear is obtained using the worm tooth profile.The double lead worm gear is modeled by the software UG.This method is suitable for common cylindrical worm modeling with different tooth profile curves and different lead.The results indicate that the presented method is precise,simple and valid,and provides a basis for the kinematic analysis,finite element analysis and CNC machining of worm-gears.
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