Design and processing method for manufacturing hollow airfoils (three-piece concept)

A method is provided for making a three-piece hollow airfoil. Three metal sheets (1,2,3) are preformed into initial shapes and sealed together to form an in-process assembly. Internal cavities (24) are formed in the assembly (29) prior to sealing. The assembly is subjected to high temperature and pr...

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Bibliographische Detailangaben
Hauptverfasser:	PATSFALL, RALPH EARL, WIGGS, GENE EDWARD, CHENG, JUNG-HO, LEMONDS, JEFFREY, MARTINI, GARY THOMAS
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	AEROPLANES AIRCRAFT AVIATION CLADDING OR PLATING BY SOLDERING OR WELDING COMBINED OPERATIONS COSMONAUTICS CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING HELICOPTERS MACHINE TOOLS MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL METAL-WORKING NOT OTHERWISE PROVIDED FOR OTHER WORKING OF METAL PERFORMING OPERATIONS PUNCHING METAL SOLDERING OR UNSOLDERING TRANSPORTING UNIVERSAL MACHINE TOOLS WELDING WORKING BY LASER BEAM WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS ORPROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL
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Beschreibung
Zusammenfassung:	A method is provided for making a three-piece hollow airfoil. Three metal sheets (1,2,3) are preformed into initial shapes and sealed together to form an in-process assembly. Internal cavities (24) are formed in the assembly (29) prior to sealing. The assembly is subjected to high temperature and pressure to diffusion bond the sheets together at selected points. The cavities (24) are then subjected to internal pressure at high temperature in order to inflate and superplastically deform the assembly to the desired shape. Excess material may be machined off after inflation. A method for partially defining the in-process shape is also provided.