Re-entrant angle closure on superplastically formed structure

Details Re-entrant angle closure on superplastically formed structure Re-entrant angle closure on superplastically formed structure

1990-03-26

1991-10-08

Dean, R.

Metal treatment

Compositions

Heat treating

148 115F, 156 79, 228157, 228193, 420902, 428178, 428593, 428594, C22F 118, B21D 2226

Patent

active

050551434

ABSTRACT:
A superplastically formed and diffusion bonded structure formed with two or more sheets and upset forging the material at the perimeter to provide the expulsive material between the inner most sheets so as to close the entrance angle formed between the expanded sheets at the line where the surfaces of the split forming fixture engage and the method of producing this structure. The upset forged material insures the structural integrity of the outside perimeter structure after removal of the flange which is normally present as a result of the holding fixture.

REFERENCES:
patent: 4304821 (1981-12-01), Hayase et al.

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