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Post-cast EDM method for reducing the thickness of a turbine nozzle wall

United States Patent

May 14, 2002
View the Complete Patent at the US Patent & Trademark Office
A post-cast EDM process is used to remove material from the interior surface of a nozzle vane cavity of a turbine. A thin electrode is passed through the cavity between opposite ends of the nozzle vane and displaced along the interior nozzle wall to remove the material along a predetermined path, thus reducing the thickness of the wall between the cavity and the external surface of the nozzle. In another form, an EDM process employing a profile as an electrode is disposed in the cavity and advanced against the wall to remove material from the wall until the final wall thickness is achieved, with the interior wall surface being complementary to the profile surface.
Jones; Raymond Joseph (Duanesburg, NY), Bojappa; Parvangada Ganapathy (Schenectady, NY), Kirkpatrick; Francis Lawrence (Galway, NY), Schotsch; Margaret Jones (Clifton Park, NY), Rajan; Rajiv (Guilderland, NY), Wei; Bin (Mechanicville, NY)
General Electric Company (Schenectady, NY)
09/ 741,767
December 21, 2000
This invention was made with Government support under Contract No. DE-FC21-95MC31176 awarded by the Department of Energy. The government has certain right in this invention.