Metal working – Method of mechanical manufacture – Impeller making
Patent
1993-06-01
1995-01-31
Cuda, Irene
Metal working
Method of mechanical manufacture
Impeller making
29889721, 2988971, 416229A, B23P 1500
Patent
active
053849590
ABSTRACT:
A hollow core fan blade for a gas turbine engine, having a continuous leading edge, is fabricated using a four-sheet superplastic forming/diffusion bonding process which results in a cost-efficient and lightweight, yet strong, structure. The rotor blade is comprised of a face sheet which has a 180 degree bend therein so that the two face sheet ends are aligned. Bonded to opposing sides of the face sheet are first and second core sheets, between which is the hollow core. To fabricate the blade, a core sheet assembly is inserted inside the prepared face sheet, thereby forming a Ti-Pack (titanium pack) assembly having a plurality of pressure-tight cells. The Ti-Pack is inserted into a cavity within a die, after which the rotor blade, having predetermined design characteristics, is superplastically formed by heating the die and selectively pressurizing the plurality of cells.
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Cuda Irene
McDonnell Douglas Corporation
Scholl John P.
Stout Donald E.
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