Mitsubishi Power, Ltd.

Mitsubishi Hitachi Power Systems, Ltd.

Takuro Hashimoto

Kunihiko Waki

Shinya Hashimoto

Kenichi Arase

Naoya Fujita

Kota Matsumoto

Koichi Akagi

Masako Idota

Takanobu Ogata

A method of forming a curved-shaped processing hole in a workpiece by electromechanical machining includes a step of feeding an electrolytic solution through an inner channel of a processing electrode and jetting the electrolytic solution from an outlet opening of the inner channel disposed on a tip surface of the processing electrode, a step of applying a potential difference between the processing electrode and the workpiece while jetting the electrolytic solution from the outlet opening of the processing electrode, and a step of forming the curved-shaped processing hole in the workpiece. In the jetting step, at least one of a current density distribution on the tip surface of the processing electrode or a flow velocity distribution of the electrolytic solution jetted from the outlet opening is eccentric to a downstream side of a curving direction of the processing hole with respect to an axial center of the tip surface.

Electromechanical machining method, method of manufacturing perforated material, processing electrode, and electromechanical machining system

An electrical discharge machining method includes selectively immersing only a portion of a workpiece in an electrical discharge machining liquid such that a machining object portion included in the portion of the workpiece is opposed to an electrode immersed in the electrical discharge machining liquid and applying an electrical discharge machining to the machining object portion by applying a voltage between the electrode and the workpiece in a state where the portion of the workpiece is selectively immersed in the electrical discharge machining liquid.

Electrical discharge machining method and electrical discharge machining device

A dummy ring assembly for removal is provided with a plurality of dummy rings. Each of the dummy rings has a dummy shroud section fitted into a vane ring groove of a casing into which a shroud of a vane segment is fitted, and has an arc shape whose central angle centered on a rotational axis is less than 90&#xb0;. The dummy shroud sections of the plurality of dummy rings are fitted sequentially into the vane ring groove of the casing. The vane segment is removed from the casing by moving the dummy rings in a circumferential direction along the vane ring groove.

Dummy ring assembly for removing vane segments, and method of removing vane segments using same

An object of the present invention is to easily remove last-stage turbine blades. Provided is an exhaust chamber inlet-side member that has an annular shape around a rotor so as to form a part of an inner diffuser at a position facing, from the axially downstream side, base ends of last-stage turbine blades disposed on the most downstream side in the axial direction, and that is divided in the circumferential direction and provided so as to be detachable from the inner diffuser. When the exhaust chamber inlet-side member is dismounted from the inner diffuser, a space on the axially downstream side from the last-stage turbine blades is cleared.

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Yokohama, Japan

Takuro Hashimoto