Metal deforming – By application of fluent medium – or energy field – Using fixed die
Patent
1989-10-30
1990-08-28
Jones, David
Metal deforming
By application of fluent medium, or energy field
Using fixed die
72 38, 72 56, 72709, 294211, B21D 2602
Patent
active
049514911
ABSTRACT:
A method and apparatus for the superplastic forming of a workpiece are disclosed. The invention comprises securing the workpiece within a die assembly located within an autoclave. The die assembly is of a type suitable for use in the superplastic fabrication of workpieces. The die assembly includes a lid, a die and first and second sealing mechanisms. The first sealing mechanism seals a first volume formed between the lid and the workpiece from a main volume of the autoclave. The second sealing mechanism is for sealing a second volume formed between the workpiece and the die from the main volume of the autoclave. The second volume has a backpressure, P.sub.b. The first volume has a pressure P.sub.f +P.sub.b where P.sub.f is the forming pressure for achieving superplastic forming of the workpiece. The main volume of the autoclave has a pressure, P.sub.m. The back pressure, P.sub.b is established so as to minimize grain boundary cavitation. A minimal pressure differential .DELTA.P=P.sub.m -P.sub.b, is established which allows retention of the required sealing, while concomitantly providing P.sub.f for the desired superplastic forming of the workpiece and eliminating the need to seal against P.sub.b.
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"E. C. Uberbacher", Superplastic Tools and Materials, Apr. 1969, vol. II, No. 11, p. 1414.
Ginsberg Lawrence N.
Jones David
Rockwell International Corporation
Silberberg Charles T.
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