Pressing method and pressing apparatus for the same

Details Pressing method and pressing apparatus for the same Pressing method and pressing apparatus for the same

1996-02-09

1997-12-16

Larson, Lowell A.

Metal deforming

By use of closed-die and coacting work-forcer

Forcing work into or within closed die; e.g., forging

723792, 72403, B21D 2200

Patent

active

056972466

ABSTRACT:
To provide a pressing method for forming dual drawn products having various product lengths, such as radiator core plate, with one type of a die unit and for preventing significant damages, which may be caused to the packing seal surface. The pressing method according to the present invention, which uses a punch and a die divided into a first die part and a second die part, sequentially includes a first drawing step for drawing the material with the punch and the first die part of a die to form a first end portion of the product; and a second drawing step for drawing the material with the punch and the second die part of the die to form a second end portion of the product.

REFERENCES:
patent: 2213648 (1940-09-01), Fraser
patent: 3425260 (1969-02-01), Anderson et al.
patent: 4543811 (1985-10-01), Aoyama
patent: 5361619 (1994-11-01), Kojima et al.
patent: 5417097 (1995-05-01), Kojima et al.

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