Metal deforming – By application of fluent medium – or energy field – With actuated tool engaging work
Patent
1998-06-02
1999-11-02
Jones, David
Metal deforming
By application of fluent medium, or energy field
With actuated tool engaging work
72 60, 294211, B21D 2602
Patent
active
059748478
ABSTRACT:
A method is disclosed for stretching sheet blanks, especially superplastic sheets, by differential gas pressure into conformity with a female die surface without encountering excessive thinning or tearing of the sheet. The warmed SPF sheet is draped over a preformed surface to draw more of the sheet material into the die cavity before the edges of the sheet are fixedly clamped whereby the additional formable material is used in forming the product, thereby reducing thinning and tears.
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patent: 4984348 (1991-01-01), Cadwell
Hamilton et al, "Superplastic Sheet Forming," Metals Handbook, Ninth Edition, vol. 14, "Forming and Forging," pp. 852-867.
Krajewski Paul Edward
Ryntz Edward Frank
Saunders Frederick Irvin
Schroth James Gregory
General Motors Corporation
Grove George A.
Jones David
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