Mitsubishi Heavy Industries Limited

Mitsubishi Hitachi Power Systems, Ltd.

Hidetaka Haraguchi

Hiroharu Oyama

Shuji Tanigawa

Takumi Matsumura

Kohei Hatano

Toshiya Watanabe

Masashi Kitamura

Ryuichi Narita

Akio Kondou

Motonari Machida

Takahiro Ota

Yasuo Matsunami

Claus Thomy

Henry Koehler

Naoyuki Umezu

Shuhei Kuroki

Naoki Kobayashi

Atsushi Yamada

Ken Ishii

Kosuke Fujiwara

Tadashi Ota

Masaki Taneike

Satoru Higuchi

Toshiyuki Wada

Tomoyuki Yamazaki

Keisuke Kamitani

Nobuhiko Saito

Michael Kalms

Yutaka Kanou

Display screen with graphical user interface

An internal defect detection system for a three-dimensional additive manufacturing device which performs additive molding by emitting a laser beam to a powder bed is provided. This system specifies a candidate position of an internal defect on the basis of a change amount of a local temperature measured in an irradiated part of a powder bed irradiated by a laser beam. The system calculates a cooling speed at the candidate position on the basis of a temperature distribution and determines whether an internal defect exists on the basis of the cooling speed.

Internal defect detection system, three-dimensional additive manufacturing device, internal defect detection method, method of manufacturing three-dimensional additive manufactured product, and three-dimensional

A heat treatment method for an additive manufactured object formed of a laminate-molded Ni-base alloy includes: a heat treatment step for carbide precipitation optimization of heating the additive manufactured object for 1 hour or longer and 100 hours or shorter at a temperature which is equal to or higher than a temperature T1 determined by Formula (1) according to amounts of component elements and is equal to or lower than 1,350&#xb0; C.; and an aging treatment step of heating the additive manufactured object for 1 to 30 hours at a temperature of 800&#xb0; C. to 950&#xb0; C. after the heat treatment step for carbide precipitation optimization.T1 (&#xb0; C.)=177&#xd7;Ni (%)+176&#xd7;Co (%)+172&#xd7;Cr (%)+178&#xd7;Mo (%)+174&#xd7;W (%)+171&#xd7;Al (%)+170&#xd7;Ti (%)+168&#xd7;Ta (%)+163&#xd7;Nb (%)+307&#xd7;C (%)&#x2212;16259&#x2003;&#x2003;(1)

Heat treatment method for additive manufactured Ni-base alloy object, method for manufacturing additive manufactured Ni-base alloy object, Ni-base alloy powder for additive manufactured object, and additive manufactured Ni-base alloy object

A three-dimensional additive manufacturing device is configured to emit a beam to a powder bed formed by laying a powder on a base plate to harden the powder bed selectively. A sensor is configured to detect the shape or the temperature of a surface of the powder bed or a modeling surface. A defect in laying of the powder or a defect in emission of the beam is corrected based on the detection result, before completion of forming of the next layer.

Three-dimensional additive manufacturing device, three-dimensional additive manufacturing method, and three-dimensional additive manufactured product

A process abnormality detection system for a three-dimensional additive manufacturing device which performs additive modeling by emitting a beam to a powder bed determines that a laying abnormality of the powder bed is occurring if at least one of a first condition that an average height of the powder bed from a reference position is out of a first predetermined range or a second condition that a height variation of the powder bed is out of a second predetermined range is satisfied, on the basis of a detection result of a shape measurement sensor.

Process abnormality detection system for three-dimensional additive manufacturing device, three-dimensional additive manufacturing device, process abnormality detection method for three-dimensional additive manufacturing device, method for manufacturing three-dimensional additive manufactured product, and three-dimensional additive manufactured product

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 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 of manufacturing a turbine blade, the method comprising forming a forging by forging stainless steel; heat treating the forging; and cooling the forging after the heat treatment; wherein in the heat treatment and the cooling, a plurality of the forgings are arranged in alignment, and adjacent forgings of the plurality of forgings are disposed so that at least respective portions of portions of the adjacent forgings corresponding to a region from a portion corresponding to a platform of a turbine blade to a center in a longitudinal direction of the turbine blade face each other and warm each other via radiant heat.

Turbine blade 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.

Method for manufacturing turbine rotor blade

Growing community of inventors

Tokyo, Japan

Hidetaka Haraguchi