Patent ID: 6743350
Filing Date: 2004-06-01
Classification: B23H

Abstract:
An electrochemical machining method for rejuvenating at least one cooling passage within an airfoil, said electrochemical machining method comprising:preparing an inner surface of the cooling passage for electrochemical machining, including removing residue from the inner surface, wherein said preparation of the inner surface comprises performing a finishing process to remove non-conductive residue; positioning an electrode in the cooling passage, the electrode comprising a conductive core and an insulating coating, the insulating coating exposing a plurality of exposed portions of the conductive core; and machining a groove pattern on the inner surface of the cooling passage using the exposed portions of the conductive core by passing an electric current between the electrode and the airfoil while circulating an electrolyte solution through the cooling passage, said machining producing a rejuvenated cooling passage.