| 摘要 |
PROBLEM TO BE SOLVED: To obtain an apparatus for forging gears, wherein loss in thickness of teeth is prevented and the quality of the formed product is stabilized. SOLUTION: The apparatus for forging the gears is constituted so that an annular die (23) for forging tooth-profile shaped teeth (24) in the inner periphery of a center hole (23a), is pressed into a fastening metal (16), and a punch for pushing a blank (40) having smooth circular shaped outer peripheral surface into the die (23) is provided, wherein the tooth-profile shaped teeth (24) in the die (23), are extension-formed over almost the whole length of the center hole (23a) with the teeth shape almost corresponding to the product, and when the above die (23) is pressed into the fastening metal (16), the blank back-pressure depending on the wear caused by the friction of the tooth-profile shaped teeth at the pushing-into time, is adjusted by making smaller of the pushing-into rate at the blank exhausting side to the pushing-into rate at the blank introducing side. COPYRIGHT: (C)2008,JPO&INPIT
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