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US 2003/0196990 A1Published application
Coolant side surface roughness on airfoil castings by electrical discharge machining (EDM)
AssigneeGeneral Electric Company
InventorsBrian Peter Arness, James Michael Placko
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Abstract
The present invention involves a process for increasing coolant side surface roughness on castings such as airfoils, shrouds, nozzles or the like by electrical discharge machining (EDM). An EDM electrode is shaped to fill completely or a portion of a cavity in the casting, the electrode is then connected to an electric discharge machine, and the internal surfaces of the internal core cavity are then machined to form a roughened surface.
Claims7
A method for increasing coolant side surface roughness, comprising the steps of:
- forming an electrical discharge machining electrode to fit into an internal core cavity of a casting;
- connecting said electrode to an electrical discharge machine;
- and
- machining the internal sides of said internal core cavity with said electrical discharge machining electrode to form a roughened surface.
1 more element
Dependencies are inferred from the claim text.