Form Rolling of Helical Gear with Small Number of Teeth and Large Helix Angle (Reduction of Work Piece Shift)

概要

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The present paper describes reduction of work piece shift of helical gears with two number of teeth and large helix angle during form rolling. In-feed form rolling using round dies was employed to form such gears. Two different kinematical models, that is, a friction roller pair and a helical gear pair, were considered to reduce work piece shift. Using these models, work piece shift could be explained as a differential motion of translation caused by the different rotation speeds of work piece in initial and finish form rolling stages. Round dies should be designed so that the die tips can accurately divide work piece root circumference on which the initial threads have formed into desired number of teeth. A series of form rolling using the round dies was performed. As a result, the round dies reduced a work piece shift, and brought high form accuracy of helical gears.