Fluid reaction surfaces (i.e. – impellers) – Specific blade structure – Hollow
Patent
1995-06-08
1997-12-02
Ramsey, Kenneth J.
Fluid reaction surfaces (i.e., impellers)
Specific blade structure
Hollow
428593, 228157, 2988972, F01D 518, B23K 2020
Patent
active
056928815
ABSTRACT:
The structure and process for making a hollow article in which the core structure is formed from two cell sheets diffusion bonded to a rib pattern sheet having a preselected pattern of ribs having passageways. The cell sheets are diffusion bonded to the rib pattern sheet using tooling pattern sheets having a geometry matching that of the rib pattern sheet thereby creating contiguous cells, interconnected by the passageways, between the cell sheets at each rib and the periphery of the structure. Inert gas is then applied to the cells during a superplastic forming process to create expanded envelopes of each cell of the core. Face sheets of the sandwich structure may then be formed from the cell sheets themselves by further expanding the cell sheets out against a mold surface. Alternatively, the envelopes of the core may be expanded and simultaneously or subsequently diffusion bonded to separate face sheets. The contour of the core may be performed, formed concurrently with separate face sheets in a single operation, or subsequently formed as a sandwich structure.
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Ramsey Kenneth J.
United Technologies Corporation
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