| 摘要 |
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
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