Center hole forming method and forging device

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United States of America Patent

PATENT NO 9776236
SERIAL NO

15023259

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Abstract

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In a center hole forming method, an object to be processed is inserted in a die hole and a shaft is drawn from the object. A load toward a first axial end surface of the object is applied to a second axial end surface of the object without taking out the object from the die hole. A diameter of the first axial end surface is smaller than a diameter of the second axial end surface. A center hole is formed in the first axial end surface by pressing a counter punch against the first axial end surface in a state that the load is applied to the second axial end surface.

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Patent Owner(s)

Patent OwnerAddress
TOYOTA JIDOSHA KABUSHIKI KAISHA1 TOYOTA-CHO TOYOTA-SHI AICHI-KEN 471-8571

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Ido, Yasutaka Toyota, JP 1 0
Kameda, Teruki Nissin, JP 3 1
Suzuki, Toshitaka Okazaki, JP 40 252

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