Method and system for reducing oversized holes on turbine components

摘要

A system is disclosed for reducing an internal diameter of a hole in a metal substrate. The system includes an electrospark device having an electrospark torch and an electrode holder rotatable about an axis. An electrode is removably supported in the electrode holder. The electrospark device configured to apply a coating of a material of which the electrode is formed, to the substrate on an inner wall of the hole when the electrode is rotated within the hole.

主权项

1. A method of reducing an internal diameter of a hole in a metal substrate comprising:
providing the metal substrate having a hole penetrating the metal substrate; providing an electrospark deposition (ESD) device, the ESD device configured to receive a rotary electrode supported axially in the ESD device; centering the electrospark torch over the hole in the substrate; inserting the rotary electrode into the hole to a predetermined length below a top surface of the metal substrate; maintaining constant the predetermined length of insertion of the rotary electrode in the hole; applying the electrode to the substrate on an inner surface of the hole; rotating the rotary electrode in contact with an inner wall of the hole; applying an electrospark process; and depositing an alloyed coating on at least a portion of the inner wall along the inner wall to reduce the diameter of the hole by a thickness of the coating.