Patents by Inventor Takehisa Okuda

Takehisa Okuda has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 10286492
    Abstract: A nozzle as a welded structure includes a nozzle body, and a buckling prevention fin joined to the nozzle body by laser welding, in which an end of the buckling prevention fin before laser welding is disposed to face the nozzle body, an installed state of the nozzle body and the buckling prevention fin includes an installed state in which a gap is formed between the nozzle body and the buckling prevention fin, and the buckling prevention fin has a beveled portion which is beveled at the end facing the nozzle body.
    Type: Grant
    Filed: April 10, 2015
    Date of Patent: May 14, 2019
    Assignee: MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Takehisa Okuda, Tadashi Itoyama, Yasuyuki Fujiya
  • Patent number: 10245678
    Abstract: 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.
    Type: Grant
    Filed: April 1, 2015
    Date of Patent: April 2, 2019
    Assignee: MITSUBISHI HITACHI POPOWER SYSTEM, LTD.
    Inventors: Takehisa Okuda, Motonari Machida, Yasuo Matsunami
  • Publication number: 20180036837
    Abstract: A welding device including a cylindrical powder nozzle (201) that supplies a powder gas containing a powder welding material toward a laser beam irradiation position of a base material and a cylindrical shield nozzle (202) that is arranged coaxially so as to cover an outer peripheral surface of the powder nozzle (201) and supplies a shielding gas for isolating the laser beam irradiation position, in which an outer peripheral surface (201b) in the vicinity of a distal end portion (201a) of the powder nozzle (201) has a shape whose outer diameter gradually decreases toward a distal end portion (201a) of the powder nozzle (201) and has an arc-shaped section on a section passing through a center axis (A) of the powder nozzle (201) is provided.
    Type: Application
    Filed: February 19, 2015
    Publication date: February 8, 2018
    Applicant: Mitsubishi Hitachi Power Systems, Ltd.
    Inventors: Naonori NAGAI, Takehisa OKUDA, Satoshi SOMETANI, Yasuo MATSUNAMI
  • Publication number: 20170120384
    Abstract: 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.
    Type: Application
    Filed: April 1, 2015
    Publication date: May 4, 2017
    Inventors: Takehisa OKUDA, Motonari MACHIDA, Yasuo MATSUNAMI
  • Publication number: 20170072509
    Abstract: 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.
    Type: Application
    Filed: April 1, 2015
    Publication date: March 16, 2017
    Inventors: Takehisa OKUDA, Motonari MACHIDA, Yasuo MATSUNAMI
  • Publication number: 20170036302
    Abstract: A nozzle as a welded structure includes a nozzle body, and a buckling prevention fin joined to the nozzle body by laser welding, in which an end of the buckling prevention fin before laser welding is disposed to face the nozzle body, an installed state of the nozzle body and the buckling prevention fin includes an installed state in which a gap is formed between the nozzle body and the buckling prevention fin, and the buckling prevention fin has a beveled portion which is beveled at the end facing the nozzle body.
    Type: Application
    Filed: April 10, 2015
    Publication date: February 9, 2017
    Inventors: Takehisa OKUDA, Tadashi ITOYAMA, Yasuyuki FUJIYA
  • Publication number: 20170016334
    Abstract: A rotor blade including: a blade main body having a tip as the upstream end in the rotation direction, and a blade surface in contact with the tip and which is the upstream surface in the 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. The boundary between the main body and the erosion shield is shaped to approach the surface opposite of the blade surface as the boundary moves from the end facing the blade surface towards the tip, and the boundary includes a first arc that includes the end facing the blade surface and a second arc arranged more towards the tip than the first arc; the first arc is convex towards the inside of the main body and the second arc is convex towards the outside of the main body.
    Type: Application
    Filed: April 1, 2015
    Publication date: January 19, 2017
    Inventors: Takehisa OKUDA, Motonari MACHIDA, Yasuo MATSUNAMI
  • Patent number: 9358638
    Abstract: A movable vacuum welding device (1) includes a vacuum chamber (7) having an edge section (12) opposite to a surface of a welding target (T) and forming a vacuum space between the surface of the welding target (T) and the vacuum chamber (7), a seal section (8) interposed between the edge section (12) and the welding target (T) throughout the entire circumference of the edge section (12), a welding head (9) configured to perform welding on the surface of the welding target (T) in the vacuum space, and a preload unit (10) configured to previously apply a load to the seal section (8). The seal section (8) includes a first seal member (27) formed of an elastic material and extending along the edge section (12), and a second seal member (28) disposed at least a rear side in a relative moving direction in which a welding bead (W) passes and having higher flexibility than the first seal member (27).
    Type: Grant
    Filed: July 26, 2013
    Date of Patent: June 7, 2016
    Assignee: MITSUBISHI HEAVY INDUSTRIES MACHINE TOOL CO., LTD.
    Inventors: Takumi Hori, Yasuyuki Fujiya, Takehisa Okuda, Osamu Hasegawa, Katsuya Sennyu, Masao Watanabe, Takaaki Kaikogi
  • Publication number: 20150258633
    Abstract: A movable vacuum welding device (1) includes a vacuum chamber (7) having an edge section (12) opposite to a surface of a welding target (T) and forming a vacuum space between the surface of the welding target (T) and the vacuum chamber (7), a seal section (8) interposed between the edge section (12) and the welding target (T) throughout the entire circumference of the edge section (12), a welding head (9) configured to perform welding on the surface of the welding target (T) in the vacuum space, and a preload unit (10) configured to previously apply a load to the seal section (8). The seal section (8) includes a first seal member (27) formed of an elastic material and extending along the edge section (12), and a second seal member (28) disposed at at least a rear side in a relative moving direction in which a welding bead (W) passes and having higher flexibility than the first seal member (27).
    Type: Application
    Filed: July 26, 2013
    Publication date: September 17, 2015
    Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.
    Inventors: Takumi Hori, Yasuyuki Fujiya, Takehisa Okuda, Osamu Hasegawa, Katsuya Sennyu, Masao Watanabe, Takaaki Kaikogi
  • Publication number: 20150233257
    Abstract: A method of welding erosion resistance metallic material is a method of welding erosion resistance metallic material to a base element (1) of a turbine blade leading edge portion (1A). The method includes the steps of: forming a curved surface in the leading edge portion (1A) 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 (1); and welding the erosion resistance metallic material to the leading edge portion (1A).
    Type: Application
    Filed: September 20, 2013
    Publication date: August 20, 2015
    Inventors: Yasuyuki Fujiya, Takehisa Okuda, Hiroharu Oyama, Motonari Machida
  • Patent number: 8951936
    Abstract: Provided is a method of manufacturing a superconducting accelerator cavity in which a plurality of half cells having opening portions (equator portions and iris portions) at both ends thereof in an axial direction are placed one after another in the axial direction, contact portions where the corresponding opening portions come into contact with each other are joined by welding, and thus, a superconducting accelerator cavity is manufactured, the half cells to be joined are arranged so that the axial direction thereof extends in a vertical direction; and concave portions that are concave towards an outer side are also formed at inner circumferential surfaces located below the contact portions of the half cells positioned at a bottom; and the contact portions are joined from outside by penetration welding.
    Type: Grant
    Filed: May 9, 2011
    Date of Patent: February 10, 2015
    Assignee: Mitsubishi Heavy Industries, Ltd.
    Inventors: Katsuya Sennyu, Hiroshi Hara, Takehisa Okuda
  • Publication number: 20130012397
    Abstract: Provided is a method of manufacturing a superconducting accelerator cavity in which a plurality of half cells having opening portions (equator portions and iris portions) at both ends thereof in an axial direction are placed one after another in the axial direction, contact portions where the corresponding opening portions come into contact with each other are joined by welding, and thus, a superconducting accelerator cavity is manufactured, the half cells to be joined are arranged so that the axial direction thereof extends in a vertical direction; and concave portions that are concave towards an outer side are also formed at inner circumferential surfaces located below the contact portions of the half cells positioned at a bottom; and the contact portions are joined from outside by penetration welding.
    Type: Application
    Filed: May 9, 2011
    Publication date: January 10, 2013
    Inventors: Katsuya Sennyu, Hiroshi Hara, Takehisa Okuda