| 摘要 |
PURPOSE:To make it unnecessary to execute the post-working after form rolling, by cutting and removing an excess thickness which is generated in an addendum of a gear billet, by keeping pace with an advance of form rolling. CONSTITUTION:A pair of roll dies 17, 18 are provided and rotated synchronously, also a hydraulic extruding mechanism 20 is provided, and a feed F1 is given in the billet diameter direction to the roll die 18. By this method, a gear billet W is rotated synchronously with the roll dies 17, 18 and form rolling is advanced. On the other hand, a milling cutter 24 is placed from the first stage of form rolling, and driven to rotate. According to this mechanism, as form rolling advances, the surface of a tooth form corresponding to the roll die 18 of the movable side swells, but as an excess thickness part grows, a higher part than the addendum surface if cut and removed by the milling cutter 24. Accordingly, when form rolling is completed, the rest of the excess thickness part is eliminated entirely, and cutting and removal being the post-working become unnecessary.
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