The processing principle of curvic coupling are introduced first

the tooth surface equation of convex and concave are inferred

and then according to the tooth surface formation principle

the processing imitates of curvic coupling are developed on AutoCAD platform with VBA program language. Based on the tooth surface equation and simulation software which are development in the article

can obtain the parameter tooth profile of convex and concave

realize the graphics simulation of the tooth surface process and draw up the three-dimension model of curvic couplings.