Metal working – Method of mechanical manufacture – Impeller making
Patent
1993-03-08
1994-02-15
Cuda, Irene
Metal working
Method of mechanical manufacture
Impeller making
298897, 29463, B23P 1500
Patent
active
052855732
ABSTRACT:
A method is provided for making a four-piece hollow airfoil. Four metal sheets are preformed into initial shapes. The sheets are sealed together into two pairs or sub-assemblies. Internal cavities are formed in one sheet from each pair prior to sealing. Each sub-assembly is subjected to high temperature and pressure in order to diffusion bond the sheets together at selected points. The cavities of each sub-assembly are then subjected to internal pressure in order to inflate and superplastically deform the sub-assemblies. The inflated sub-assemblies are combined to form a single assembly and the cavities are again subjected to internal pressure in order to bond the sub-assemblies together. The assembly is then exposed to hot isostatic pressing, after which, excess material is machined off.
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Cheng Jung-Ho
Cogan Richard M.
LeMonds Jeffrey
Martini Gary T.
Wiggs Gene E.
Cuda Irene
General Electric Company
Scanlon Patrick L.
Webb II Paul R.
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