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

A post-cast EDM process is used to remove material (34) from the interior surface of a nozzle vane cavity of a turbine. A thin electrode (28) is passed through the cavity (18) between opposite ends of the nozzle vane (16) and displaced along the interior nozzle wall to remove the material (34) along...

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Bibliographische Detailangaben
Hauptverfasser:	BOJAPPA, PARVAGADA GANAPATHY, WEI, BIN, RAJAN, RAJIV, SCHOTSCH, MARGARET JONES, KIRKPATRICK, FRANCIS LAWRENCE, JONES, RAYMOND JOSEPH
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	BLASTING CASTING CASTING OF METALS CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES ENGINE PLANTS IN GENERAL HEATING LIGHTING MACHINE TOOLS MACHINES OR ENGINES IN GENERAL MECHANICAL ENGINEERING METAL-WORKING NOT OTHERWISE PROVIDED FOR NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAMTURBINES PERFORMING OPERATIONS POWDER METALLURGY STEAM ENGINES SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL TRANSPORTING WEAPONS WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OFELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKESTHE PLACE OF A TOOL
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Beschreibung
Zusammenfassung:	A post-cast EDM process is used to remove material (34) from the interior surface of a nozzle vane cavity of a turbine. A thin electrode (28) is passed through the cavity (18) between opposite ends of the nozzle vane (16) and displaced along the interior nozzle wall to remove the material (34) along a predetermined path, thus reducing the thickness of the wall between the cavity and the external surface of the nozzle. In another form, (not shown) 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.