Method and device for pressing sheet material with a deformable

Details Method and device for pressing sheet material with a deformable Method and device for pressing sheet material with a deformable

1989-12-28

1991-05-21

Jones, David

Metal deforming

By application of fluent medium, or energy field

With actuated tool engaging work

72 63, 72465, 294211, B21D 2602

Patent

active

050164589

ABSTRACT:
Method for pressing sheet material, in particular sheet metal, on a press by way of a cushion (12) composed of an elastic material, comprising disposing a sheet blank (20) to be formed on a support whose peripheral part forms a lower blank holder (2) and whose central part constitutes a die (3), applying, under the action of an outer slide, an upper blank holder (9) on the peripheral portion of the sheet blank (20), then applying a punch (11) under the effect of a ram, the method further comprising, in the course of a first step, applying, under the action of the ram, the cushion (12) on the sheet blank (20) for preforming the sheet blank in such manner as to impart thereto a surface area substantially equal to the surface area of the finished part to be obtained, then, in the course of a second step, continuing, under the action of the ram, the descent of the elastic cushion (12) and simultaneously displacing all or a part of the bottom of the die (3) for achieving the final shaping of the part.

REFERENCES:
patent: 2422883 (1947-06-01), Bruderlin
patent: 2507194 (1950-05-01), Chyba
patent: 2719500 (1955-10-01), Kraybill
patent: 2783727 (1957-03-01), Hoffman
patent: 3357218 (1967-12-01), Mitchell
patent: 3533256 (1970-10-01), Hurek et al.
patent: 3585829 (1971-06-01), Hurek
patent: 4689979 (1987-09-01), Otsuka et al.
patent: 4770015 (1988-09-01), DeSmet
patent: 4833903 (1989-05-01), DeSmet

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