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

Abstract

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.

Inventors:
 [1];  [2];  [3];  [4];  [5];  [6]
  1. Duanesburg, NY
  2. Schenectady, NY
  3. Galway, NY
  4. Clifton Park, NY
  5. Guilderland, NY
  6. Mechanicville, NY
Issue Date:
Research Org.:
General Electric Co., Schenectady, NY (United States)
OSTI Identifier:
874435
Patent Number(s):
6388223
Assignee:
General Electric Company (Schenectady, NY)
Patent Classifications (CPCs):
B - PERFORMING OPERATIONS B23 - MACHINE TOOLS B23H - WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL
F - MECHANICAL ENGINEERING F01 - MACHINES OR ENGINES IN GENERAL F01D - NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
DOE Contract Number:  
FC21-95MC31176
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
post-cast; edm; method; reducing; thickness; turbine; nozzle; wall; process; remove; material; interior; surface; vane; cavity; electrode; passed; opposite; displaced; predetermined; path; external; form; employing; profile; disposed; advanced; final; achieved; complementary; interior surface; external surface; /219/416/

Citation Formats

Jones, Raymond Joseph, Bojappa, Parvangada Ganapathy, Kirkpatrick, Francis Lawrence, Schotsch, Margaret Jones, Rajan, Rajiv, and Wei, Bin. Post-cast EDM method for reducing the thickness of a turbine nozzle wall. United States: N. p., 2002. Web.
Jones, Raymond Joseph, Bojappa, Parvangada Ganapathy, Kirkpatrick, Francis Lawrence, Schotsch, Margaret Jones, Rajan, Rajiv, & Wei, Bin. Post-cast EDM method for reducing the thickness of a turbine nozzle wall. United States.
Jones, Raymond Joseph, Bojappa, Parvangada Ganapathy, Kirkpatrick, Francis Lawrence, Schotsch, Margaret Jones, Rajan, Rajiv, and Wei, Bin. Tue . "Post-cast EDM method for reducing the thickness of a turbine nozzle wall". United States. https://www.osti.gov/servlets/purl/874435.
@article{osti_874435,
title = {Post-cast EDM method for reducing the thickness of a turbine nozzle wall},
author = {Jones, Raymond Joseph and Bojappa, Parvangada Ganapathy and Kirkpatrick, Francis Lawrence and Schotsch, Margaret Jones and Rajan, Rajiv and Wei, Bin},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2002},
month = {1}
}

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