Abstract:During the process of spiral bevel gear addendum chamfering, the cutter moves material according to a certain trajectory and this process must first determine the mathematical model of tooth top line. Based on the tooth surface of spiral bevel gear processing principle, this paper established the mathematical model of tooth surface for spiral bevel gear, and then, with gears outside the cone surface equation according to the curved surface intersection method to get the mathematical model of the tooth top line, for the spiral bevel gear addendum chamfering processing to provide theoretical support.