Compression forming of sheet material

Details Compression forming of sheet material Compression forming of sheet material

1980-05-16

1982-10-05

Gilden, Leon

Metal deforming

With exposure of work to gas, vapor, mist, or modified...

72 60, 72342, 72364, B21B 900

Patent

active

043522807

ABSTRACT:
A sheet of material is held in a die opposite a forming surface of the die, and gas pressure is applied to both sides of the sheet. The pressure creates a compressive stress in the sheet thickness direction sufficient to cause plastic flow. By maintaining the pressure higher on the side of the sheet opposite to the forming surface, the sheet bends and expands toward the die forming surface. This pressure differential can be increased as necessary to bend the sheet into the crevices which make up the details of the forming surface. The sheet may be heated during forming to lower the compressive stress which is required to cause it to flow plastically.

REFERENCES:
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patent: 3516274 (1970-06-01), Graham et al.
patent: 3920175 (1975-11-01), Hamilton et al.
patent: 3927817 (1975-12-01), Hamilton et al.
patent: 3974673 (1976-08-01), Fosness et al.
patent: 4087037 (1978-05-01), Schier
patent: 4197977 (1980-04-01), Deminet
patent: 4233829 (1980-11-01), Hamilton
patent: 4233831 (1980-11-01), Hamilton et al.
patent: 4266416 (1981-05-01), Festag et al.

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