Method of manufacturing an article by superplastic forming and d

Details Method of manufacturing an article by superplastic forming and d Method of manufacturing an article by superplastic forming and d

1993-04-12

1994-11-15

Ramsey, Kenneth J.

Metal working

Method of mechanical manufacture

Impeller making

228157, B23K 3102

Patent

active

053635558

ABSTRACT:
A plurality of titanium sheets are assembled into a stack. At least one of the sheets is provided with a stop off material on one of its surfaces to prevent diffusion bonding at predetermined positions. The edges of the sheets are welded together and a pipe is welded to the stack to interconnect with the stop off material to form a sealed assembly. The assembly is heated and externally pressurized to diffusion bond the sheets together. The integral structure so formed is heated and opposite ends of the integral structure are twisted relatively to contour the integral structure to a predetermined shape. The integral structure is internally pressurized to break the adhesive bonds. The integral structure is heated and internally pressurized to superplastically form one sheet to produce an article, e.g. a fan blade.

REFERENCES:
patent: 4526312 (1985-07-01), Goss et al.
patent: 4833768 (1989-05-01), Ecklund et al.
patent: 4882823 (1989-11-01), Weisert et al.
patent: 5063662 (1991-11-01), Porter et al.

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