Press forming die set and method

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

Reexamination Certificate

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Details

C072S351000

Reexamination Certificate

active

07861568

ABSTRACT:
A die set for press-forming a blank of thin metallic sheet. The die set has a punch and a blank holder. The blank holder has a first bead for restraining an edge of the blank with a constant force. The first bead is disposed further to an inside than a second bead for restraining the edge of the blank with a force that varies during pressing of the blank.

REFERENCES:
patent: 4195510 (1980-04-01), Juergens
patent: 5901599 (1999-05-01), Sato et al.
patent: 09-029349 (1997-02-01), None

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