Apparatus for superplastic forming of large cylindrical structur

Details Apparatus for superplastic forming of large cylindrical structur Apparatus for superplastic forming of large cylindrical structur

1992-05-04

1993-05-11

Jones, David

Metal deforming

By application of fluent medium, or energy field

Using fixed die

72 60, 72709, 7234294, 294211, B21D 2602

Patent

active

052090930

ABSTRACT:
An SPF press is capable of forming large generally cylindrical structures from a sheet made of a first metal such as Titanium. The sheet is first rolled into a cylindrical or conical part blank. The press has a generally cylindrical ceramic die with a surface defining the contour of a part to be formed. The part is formed by pressing a first side of the part blank against the die utilizing high pressure gas. Generally cylindrical gas impervious seals overlie the opposite ends of the cylindrical part blank on a second side thereof opposite the first side. Each of these gas impervious seals includes a support member and a seal member which are spaced apart to define a gap therebetween. A generally cylindrical seal ring is seated in each gap and contacts the second side of the cylindrical part blank. The seal rings are made of a second metal that is softened at a temperature at which the first metal becomes superplastic. This allows the seal rings to deform and provide a substantially gas impervious seal to prevent high pressure gas introduced against a medial portion of the cylindrical part blank from escaping to the ends of the part blank.

REFERENCES:
patent: 4429824 (1984-02-01), Woodward
patent: 4437326 (1984-03-01), Carlson
patent: 4765166 (1988-08-01), Bergman et al.
patent: 4951491 (1990-08-01), Lorenz
patent: 4984732 (1991-01-01), Hudson et al.

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