Patent ID: 6495796
Filing Date: 2002-12-17
Classification: B23K

Abstract:
A high density energy beam machining method for emitting a high density energy beam to a work piece having an inside space to perform a cut-machining for allowing the inside space of said work piece to communicate with an outside thereof, comprising the steps of:emitting the high density energy beam to an emitted portion of said work piece, said emitted portion located at the outside of said work piece; supplying a first assist gas from the outside of said work piece to said emitted portion; supplying a second assist gas from an inside of said work piece to said emitted portion; and providing a gas discharging nozzle in the inside space of said work piece for supplying the second assist gas from the inside of said work piece, wherein the first assist gas flows on an outside surface of said work piece around said emitted portion, at least a part of the second assist gas flows to the outside of said work piece through a cut portion formed in said work piece by an emission of the high density energy beam, said gas discharging nozzle shuts the high density energy beam intruding into the inside of said work piece through the cut portion, so that the high density energy beam is not emitted to an inside surface of said work piece, which is opposite to said cut portion.