Method of press molding and molding device

Metal deforming – By use of closed-die and coacting work-forcer – Cup or shell drawing

Reexamination Certificate

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Details

C072S309000

Reexamination Certificate

active

07322222

ABSTRACT:
The sheet metal blank to be press molded comprises a product section (W1) and a grip section (W2) disposed on the periphery of the product section (W1). The press molding device performs press molding on the product section (W1) while gripping the grip section (W2) with the upper die (11) and the lower die (12). A bead (W3) comprising alternately disposed indented sections (A, C) and protruding sections (B, D) is press molded beforehand on the grip section (W2) by meshing the indented corners (6, 8) and protruding corners (3, 5) formed on the lower die (12) with corresponding indented corners (7, 9) and protruding corners (2, 4) formed on the upper die (11). Consequently a preferable constraining force without reducing the radius of the indented sections (A, C) and protruding sections (B, D), thereby protecting the galvanized surface of the sheet blank from chipping.

REFERENCES:
patent: 3664172 (1972-05-01), Cvacho
patent: 4096729 (1978-06-01), Dupler
patent: 5014537 (1991-05-01), Nine
patent: 5701777 (1997-12-01), Yamanaka et al.
patent: 6196043 (2001-03-01), Ehardt
patent: 195 04 264 (1996-08-01), None
patent: 103 22 272 (2004-12-01), None
patent: 56160836 (1981-12-01), None
patent: 63-177926 (1988-07-01), None
patent: 03066423 (1991-03-01), None
patent: 10-5889 (1998-01-01), None
patent: 2003-164922 (A) (2003-06-01), None

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