According to lead form principle of cylindrical gear with involute helicoids,it is analyzed of several theoretical methods on lead modification of involute helicoids gears by using CNC form grinding .

• 依据渐开螺旋面圆柱齿轮齿向成形原理，分析数控成形磨削渐开螺旋面齿轮齿向修形的各种理论方法。