Metal working – Method of mechanical manufacture – Impeller making
Patent
1992-12-16
1993-12-14
Cuda, Irene
Metal working
Method of mechanical manufacture
Impeller making
298897, 29463, 416241R, 416232, 416233, 228157, B23P 1500
Patent
active
052690580
ABSTRACT:
A method for forming a hollow, internally-ribbed airfoil having a complex geometry. The process forms airfoil halves from alloy members in essentially final machined form. The airfoil halves optionally include a gasket around their periphery and optionally, a gasket around the internal sequence of ribs and cavities. Because the airfoil halves are in final form before joining, important interior airfoil dimensions such as skin thickness, cavity size, rib location and gasket location as well as exterior dimensions such as camber and twist may be verified prior to joining. The airfoil halves are then joined by welding, thereby sealing their interiors and diffusion bonding at relatively low pressures. The gaskets eliminate the use of high pressures and associated skin buckling and permit a concentration of the loads at key locations despite the low pressures. After diffusion bonding, any voids are removed by hot isostatically pressing the airfoil in the superplastic temperature range of the alloy.
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Hansen Kurt L.
Kelley John R.
Wiggs Gene E.
Cuda Irene
General Electric Company
Maria Carmen Santa
Squillaro Jerome C.
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