A form rolling method for an involute gear, which includes a work piece including a cylindrical outer peripheral surface having a predetermined radius, and a round die with an involute tooth profile including an addendum pitch corresponding to a pitch defined by dividing a length of an outer circumference of the work piece by number of teeth of the involute gear. The round die is pressed to the work piece while rotating when form rolling the involuete gear.

Form rolling method for involute gear

PROBLEM TO BE SOLVED: To provide a method and an apparatus for form-rolling a gear which are suitable for extending the service life of a roller die and shortening a forming cycle time. SOLUTION: The method for applying the form-rolling to the outer peripheral part of a disk-like workpiece W by pushing a form-rolling die 2 provided with a plurality of working teeth 3A-3C for performing the form-rolling into the outer peripheral part of the workpiece W with a prescribed pushing-in speed while synchronizedly rotating to the workpiece W comprises: a first process for forming form-rolling teeth W2 at the intermediate step with the roller die 2A provided with a larger pressure angle of working teeth 3A than a prescribed pressure angle of the finish tooth shape; a second process for forming tooth bottom and tooth shape of the roll-formed teeth W2 with a roller die 2B provided with the form-rolling teeth W2 having a prescribed pressure angle of the finished tooth-shape; and a third process for forming the tooth tip parts of the form-rolling teeth W2 with the roller die 2C provided with the working teeth 3C for forming the tooth tip range of the finish tooth shape. COPYRIGHT: (C)2009,JPO&INPIT

Osanawa Tomoyoshi

Papers

Method and apparatus for form-rolling gear