Mitsubishi Hitachi Power Systems, Ltd.

Mitsubishi Power, Ltd.

Motonari Machida

Hiroharu Oyama

Takehisa Okuda

Yasuo Matsunami

Takumi Matsumura

Kohei Hatano

Hidetaka Haraguchi

Takahiro Ota

Ken Ishii

Yasuyuki Fujiya

Keisuke Kamitani

Naoyuki Umezu

Shuhei Kuroki

A rotor blade includes: a blade main body having a tip as an upstream end in a rotation direction, and a blade surface in contact with the tip and which is an upstream surface in a flow direction of a work fluid; and an erosion shield formed as a cladding portion using laser welding on the tip and the blade surface. A boundary between the blade main body and the erosion shield is shaped to approach a surface opposite the blade surface from an end facing the blade surface towards the tip. The boundary includes a first arc that includes the end facing the blade surface and a second arc closer towards the tip than the first arc. The first arc is convex towards an inside of the blade main body and the second arc is convex towards an outside of the blade main body.

Turbine blade, erosion shield forming method, and turbine blade manufacturing method

A method of welding erosion resistance metallic material is a method of welding erosion resistance metallic material to a base element () of a turbine blade leading edge portion (A). The method includes the steps of: forming a curved surface in the leading edge portion (A) to which the erosion resistance metallic material is applied so that a radius R of the curved surface is larger than thickness t of the base element (); and welding the erosion resistance metallic material to the leading edge portion (A).

Method of welding erosion resistance metallic material and turbine blade

A cladding-by-welding device, an erosion shield forming method, and a turbine blade manufacturing method forming an erosion shield having high erosion resistance including: a powder supply head; a laser head; a line generator configured to irradiate a measurement line beam; a imaging device; a movement mechanism configured to move the powder supply head and the laser head with respect to a base body; and at least one controller configured to cause a projection image on the base body of the measurement line beam acquired by the imaging device to overlap a predetermined position of the imaging device, to set a position where the projection image overlaps the predetermined position of the imaging device as a copying position, to control the movement mechanism based on the copying position, and to move the powder supply head and the laser head with respect to the base body.

Cladding-by-welding device, erosion shield forming method, and turbine blade manufacturing method

A heating step, in which a stainless member is heated to a temperature within or above a heating phase-transformation temperature range (Ar) in which the stainless member is phase-transformed, is executed. A cooling step in which the stainless member heated in the heating step is cooled to a temperature below a cooling phase-transformation temperature range (Mr) in which the stainless member is phase-transformed, is executed. In the cooling step, cooling of the stainless member is suppressed in a control temperature range including the cooling phase-transformation temperature range (Mr).

Method for heat treatment of stainless member, and method for producing forged stainless product

A management method of a powder supply head in which supplied cladding metal is stabilized, and a method and apparatus for forming an erosion shield. The powder supply head has a double tube that supplies the cladding metal to a cladding portion and includes an inner tube that sprays a cladding metal used for cladding by welding and an outer tube that concentrically overlaps the inner tube and sprays a shielding air. The method including: spraying the cladding metal from the powder supply head to a test region; measuring a width of the cladding metal sprayed onto the test region; in a case where the measured width of the cladding metal is an allowance or smaller, determining that the powder supply head is usable, and in a case where the measured width of the cladding metal is greater than the allowance, determining that the powder supply head is unusable.

Management method of powder supply head, and method and apparatus for forming erosion shield

A steam turbine vane manufacturing method including: a groove processing step for forming a protective part joint surface on a steam turbine vane material that has been subjected to rough processing; a build-up welding step for forming, by build-up welding, a protective part build-up bead on the protective part joint surface; and a processing step for performing processing, by cutting the first steam turbine vane material that has been subjected to rough processing and the protective part build-up bead, to finish the first steam turbine vane material has been subjected to rough processing so that the first steam turbine vane material becomes a second steam turbine vane material that has been subjected to finishing processing. The first steam turbine vane material that has been subjected to rough processing is larger than the second steam turbine vane material that has been subjected to finishing processing.

Steam turbine vane manufacturing method

A method for manufacturing a turbine rotor blade wherein warping, bending and twisting of the entire rotor blade, which is provided with an excess thickness portion after a forging step, can be suppressed. In the forging step in a process for manufacturing a rotor blade (), the forging is hot-forged such that the distance (the excess thickness amount) from the blade surface of the blade section () to the surface of the excess thickness section is substantially uniform along the entire periphery of a cross section of the blade section () and the excess thickness section () perpendicular to the blade length direction, and such that the amount of the excess thickness in the blade length direction, which is the thickness of the excess thickness section (), gradually increases toward the blade tip from a prescribed position.

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Tokyo, Japan

Motonari Machida