Mitsubishi Heavy Industries Limited

National Institute of Advanced Industrial Science and Technology

Technology Research Association for Future Additive Manufacturing

Ryuichi Narita

Shuji Tanigawa

Toshiya Watanabe

Saneyuki Goya

Yasuyuki Fujiya

Masashi Kitamura

Akio Kondou

Hidetaka Haraguchi

Claus Thomy

Masahiko Shimizu

Kazuhiro Yoshida

Akiko Inoue

Yoshinao Komatsu

Henry Koehler

Masahiro Kimura

Takeshi Kaneko

Hiroyuki Fujiwara

Ryota Ozaki

Nobuyuki Hori

Tadahiro Kimura

Yuki Kani

Koji Okimura

Masanori Toyoda

Nobutaka Nakajima

Misaki Fukuyama

Masahiko Toyoda

Christian Freitag

Rudolf Weber

Thomas Seefeld

Masahito Matsubara

Masao Shiota

Takashi Hanioka

Tomohisa Ota

Moritatsu Nishimura

Harutaka Suzuki

Takafumi Hiro

Dieter Tyralla

Ehsan Zahedi

Michael Kalms

Takayuki Numata

A laser machining device includes: a laser irradiation unit that forms a machining groove that has one end opening to an end section of a workpiece and the other end thereof closed, as a result of scanning a workpiece surface from an end section of the workpiece and laser machining the workpiece; and a nozzle unit that sprays a gas across an irradiation zone of the workpiece surface created by the laser irradiation unit. The nozzle unit is configured so as to increase the flowrate of the gas supplied to the irradiation zone, from one end to the other end of the machining groove.

Laser machining device

A laser light profile measuring device of the present disclosure includes a reflection attenuation part reflecting and attenuating at least part of laser light incident from a first direction in a direction different from the first direction to generate measurement target laser light traveling in the first direction, a capture unit placed on one side of the reflection attenuation part in the first direction and which captures the measurement target laser light, a cooling body covering at least part of the reflection attenuation part and the capture unit in a circumferential direction with respect to the first direction, a refrigerant supply unit forcibly feeding a refrigerant toward the cooling body, and a rotation support part supporting the reflection attenuation part, the cooling body, and the refrigerant supply unit to be rotatable around a rotation axis extending in a horizontal direction.

Laser light profile measuring device and laser light profile measuring method

This laser processing device is provided with a laser radiating unit which forms a processed groove extending in a scanning direction on a workpiece, by subjecting the workpiece to laser processing while scanning the surface of the workpiece, and a nozzle portion which has a plurality of ejection holes arranged side by side in the scanning direction, and which ejects a gas toward the processed groove from each of the ejection holes. With this laser processing device, since a plume is eliminated by ejecting gas into the processed groove by means of the nozzle portion, the formation of a heat affected layer by the plume can be suppressed to an even greater extent.

Laser processing device

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 laser processing method includes a first step of irradiating a surface of a composite material with a laser to form a hole processing groove on the composite material by scanning first paths from an outside corresponding to an inner peripheral surface side of a through hole to be formed to an inside corresponding to a center side of the through hole to be formed, the first paths extending across a width direction of the hole processing groove; and a second step of irradiating and penetrating through the hole processing groove with the laser to form the through hole by scanning second paths from the outside to the inside after the first step, the second paths extending across the width direction of the hole processing groove. The laser used at the first step has a smaller heat input amount per unit time than the laser used at the second step.

Laser processing method and laser processing apparatus

An additive manufacturing method includes: forming a powder bed by supplying a raw material powder; and irradiating the raw material powder that forms the powder bed with a light beam having an intensity distribution of a second or higher order mode or of a top hat shape.

Additive manufacturing method and additive manufacturing apparatus

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

An electron beam welding method capable of restoring toughness even when high heat input welding is performed. The electron beam welding method comprises: forming a first weld bead () so as to include a groove () provided at the butt portions of two base materials (), and forming a second weld bead () and a third weld bead () having a narrower width than the first weld bead (), at predetermined positions displaced from the groove () and centered symmetrically about the butt portions so as to include a portion of the first weld bead (), using a lower heat input than that used during formation of the first weld bead ().

Electron beam welding method

[Problem] To facilitate mounting of a nozzle. [Solving Means] In a nozzle mounting structure for mounting a nozzlepenetrating through a reactor vesselhaving a hemispherical concave inner surface, the nozzle mounting structure includes a removed concave portionin which a base materialon an inner surface side of the reactor vesselis removed in a symmetrical shape around a normal line N on the hemispherical concave inner surface of the reactor vessel, a flangeprovided on the nozzle, formed in a same symmetrical shape as that of the removed concave portionaround the normal line N, and inserted into the removed concave portion, and a weld partprovided around the normal line N for welding the flangeto the reactor vessel

Nozzle mounting structure

Growing community of inventors

Tokyo, Japan

Ryuichi Narita