Fluid reaction surfaces (i.e. – impellers) – Specific blade structure – Laminated – embedded member or encased material
Patent
1991-07-31
1993-08-31
Look, Edward K.
Fluid reaction surfaces (i.e., impellers)
Specific blade structure
Laminated, embedded member or encased material
416224, 416233, 416241R, 416223A, 2988971, 2988972, 228157, F01D 518
Patent
active
052403769
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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Look Edward K.
McDonnell Douglas Corporation
Scholl John P.
Stout Donald E.
Verdier Christopher
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