Process and apparatus for press forming

Details Process and apparatus for press forming Process and apparatus for press forming

1993-09-01

1994-11-08

Larson, Lowell A.

Metal deforming

By use of closed-die and coacting work-forcer

Cup or shell drawing

B21D 2226

Patent

active

053616197

ABSTRACT:
To produce deep-drawn articles having various lengths by effecting forming and trimming without an increase in the production cast, a process comprises the steps of: a first step of press-forming a blank in the portions corresponding to both ends of a deep-drawn product having a desired length to form a semi-deep-drawn product in the form of a vessel having both ends deep-drawn to a vessel form and an unformed mid-length portion; and a second step of press-forming the unformed mid-length portion of the semi-deep-drawn product to complete a deep-drawn product in the form of a vessel. An apparatus for carrying out the process comprises: a first die assembly having dies and punches disposed facing each other and movable corresponding to both ends of a deep-drawn product, to form the semi-deep-drawn product having both ends deep-drawn to a vessel form and an unformed mid-length portion not deep-drawn; and a second die assembly with dies and punches disposed corresponding to the unformed portion, to press-form the unformed portion thereby completing a deep-drawn product.

REFERENCES:
patent: 1184009 (1916-05-01), O'Leary
patent: 1442912 (1923-01-01), Stoddard
patent: 2390359 (1945-12-01), Ernst
Iseki et al: "Flexible Die Assembly of Combined Unit Block Tools", 41st Conference of Plastic Working League, 1-3 Oct. 1990.

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