Nippondenso Co., Ltd.

Kazuhiro Morita

Yoshitaka Kuroda

Tokuo Shirai

Shinichi Ezaka

Syoishi Takenouchi

There is disclosed a metal plate laminated body. When a portion encircled by inner and outer closed curves is embossed, a projection is protruded from a lower surface of a metal plate. Since a width of protrusion is slightly larger than that of a recess, when press-fitting the projection into the recess of the contiguous metal plate, an outer peripheral surface of the projection which is formed along the outer closed curve is brought into press-contact with an outer peripheral surface of the recess; and an inner peripheral surface of the projection which is formed along the inner closed curve similarly comes in press-contact with an inner peripheral surface of the recess. These inner and outer peripheral surfaces cooperate to become effective contactual surfaces, and the contiguous metal plates are joined to each other.

Metal plate laminated body

During the forging step two metallic flows are generated in the metallic blank, one is an elongating flow toward the flange portion and another is an elongating flow toward the cylindrical portion. These metallic flow are generated simultaneously. Since the metallic blank elongates toward the cylindrical portion and the flange portion at the same time, the metallic structure of the product formed by the present forging method does not develop a slide surface, so that no weak portion is generated in the product.

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Anjo, Japan

Kazuhiro Morita