Method of manufacturing hollow articles by superplastic forming

Details Method of manufacturing hollow articles by superplastic forming Method of manufacturing hollow articles by superplastic forming

1996-08-08

1998-03-24

Cuda, Irene

Metal working

Method of mechanical manufacture

Impeller making

2988971, 228157, B23P 1500

Patent

active

057299013

ABSTRACT:
A plurality of hollow blades are produced by assembling a plurality of titanium sheets and a plurality of titanium blocks into a stack. At least one of the sheets is provided with a stop off material on one of its surfaces at a plurality of longitudinally spaced pre-selected areas to prevent diffusion bonding at these areas to define the hollow interiors of the blades. The edges and ends of the sheets are welded together and the blocks are welded to the sheets. The assembly is heated and externally pressurised to diffusion bond the sheets and blocks together. The integral structure so formed is then heated and internally pressurised to superplastically form at least one of the sheets at each of the pre-selected areas to produce a plurality of hollow blades. Thereafter the hollow blades are separated from each other by machining and simultaneously producing the aerofoil shapes.

REFERENCES:
patent: 5016805 (1991-05-01), Cadwell
patent: 5141146 (1992-08-01), Yasui
patent: 5253419 (1993-10-01), Collot et al.
patent: 5285573 (1994-02-01), LeMonds et al.
patent: 5344063 (1994-09-01), Johnston et al.
patent: 5363555 (1994-11-01), Fowler et al.
patent: 5457884 (1995-10-01), Fowler et al.
patent: 5479705 (1996-01-01), Fowler et al.
patent: 5581882 (1996-12-01), Fowler et al.

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