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In gear generating method, the variation of angular velocity in cutting process causes involute profile error. This study deals with effect of variation of angular velocity between tool and workpiece influencing involute profile error in gear roll forming process. As the tooth profiles are finished by rolling on the uniform load, it becomes evident by experiments that angular velocity between tool and workpiece varies slightly by period of normal pitch between contacting teeth. The following results are obtained by theoretical analysis : The variation of angular velocity is based on the rolled involute profile error by itself, and the amplitude of its variation corresponds to difference of plastic deformation between the tooth of driven side and of follower side.

Effect of variation of angular velocity on profile errors in gear roll forming process.