Patents by Inventor Yomei Yoshioka

Yomei Yoshioka 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: 9447486
    Abstract: An Ni-based alloy for casting used for a steam turbine of an embodiment contains in percent (%) by mass C (carbon): 0.01 to 0.1, Cr (chromium): 15 to 25, Co (cobalt): 10 to 15, Mo (molybdenum): 5 to 12, Al (aluminum): 0.5 to 2, Ti (titanium): 0.3 to 2, B (boron): 0.001 to 0.006, Ta (tantalum): 0.05 to 1, Si (silicon): 0.1 to 0.5, Mn (manganese): 0.1 to 0.5, and the balance of Ni (nickel) and unavoidable impurities.
    Type: Grant
    Filed: June 4, 2012
    Date of Patent: September 20, 2016
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Kuniyoshi Nemoto, Yomei Yoshioka, Kiyoshi Imai, Shigekazu Miyashita, Takeo Suga
  • Patent number: 8828313
    Abstract: An Ni-base alloy for a turbine rotor of a steam turbine contains in percent by weight C: 0.01 to 0.15, Cr: 15 to 28, Co: 10 to 15, Mo: 8 to 12, Al: 1.5 to 2, Ti: 0.1 to 0.6, B: 0.001 to 0.006, Re: 0.5 to 3, and the balance of Ni and unavoidable impurities.
    Type: Grant
    Filed: March 13, 2009
    Date of Patent: September 9, 2014
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Kuniyoshi Nemoto, Kiyoshi Imai, Yomei Yoshioka, Masayuki Yamada, Reki Takaku, Shigekazu Miyashita, Takeo Suga, Takeo Takahashi, Kenichi Okuno, Akihiro Takakuwa
  • Publication number: 20140096872
    Abstract: In a brazing repair material 3 which is charged into a repairing portion of base material 1 in which a failure such as a crack 2 and corrosion is generated, diffusion heat treatment is carried out, the brazing repair material 3 is integrally bonded to the repairing portion to repair the repairing portion, the brazing repair material 3 comprises a mixture of non-molten alloy powder having a composition similar to that of the base material 1 and molten alloy powder which is melted at a temperature of the diffusion heat treatment, and the molten alloy powder is brazing repairing alloy consisting of 0.001 to 0.05 mass % of C, 2 to 5 mass % of Si, 10 to 25 mass % of Cr, 15 to 25 mass % of Co, 1 to 5 mass % of B, and balance of Ni, and excluding Al. With this configuration, a part having a failure such as a crack can restore original characteristics like the inherent base material.
    Type: Application
    Filed: December 11, 2013
    Publication date: April 10, 2014
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Yomei YOSHIOKA, Toshiaki FUSE, Daizo SAITO, Reki TAKAKU, Kazuhiro KITAYAMA, Kazutoshi ISHIBASHI
  • Patent number: 8333006
    Abstract: A method for removing a crack in an electromechanical rotor, including: forming a plurality of slots on a periphery of a core portion of an electromechanical rotor along an axial direction thereof; inserting coils into the slots, respectively; forming a plurality of wedges for maintaining the coils in the slots, respectively; and forming a cut hole at at least a part of the core portion from an outer surface of the core portion toward the side of a center axis thereof so as to contain a crack along a circumferential direction thereof.
    Type: Grant
    Filed: December 27, 2006
    Date of Patent: December 18, 2012
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Koji Matsuyama, Hideki Chiba, Hiromichi Ito, Yomei Yoshioka, Kazuhiro Saito, Yasuo Kabata, Ryoji Nagano, Hiroaki Koinuma, Kaname Hirai, Toshio Kitajima
  • Publication number: 20120315133
    Abstract: An Ni-based alloy for casting used for a steam turbine of an embodiment contains in percent (%) by mass C (carbon): 0.01 to 0.1, Cr (chromium): 15 to 25, Co (cobalt): 10 to 15, Mo (molybdenum): 5 to 12, Al (aluminum): 0.5 to 2, Ti (titanium): 0.3 to 2, B (boron): 0.001 to 0.006, Ta (tantalum): 0.05 to 1, Si (silicon): 0.1 to 0.5, Mn (manganese): 0.1 to 0.5, and the balance of Ni (nickel) and unavoidable impurities.
    Type: Application
    Filed: June 4, 2012
    Publication date: December 13, 2012
    Applicant: Kabushiki Kaisha Toshiba
    Inventors: Kuniyoshi NEMOTO, Yomei YOSHIOKA, Kiyoshi IMAI, Shigekazu MIYASHITA, Takeo SUGA
  • Publication number: 20110088260
    Abstract: In a brazing repair material 3 which is charged into a repairing portion of base material 1 in which a failure such as a crack 2 and corrosion is generated, diffusion heat treatment is carried out, the brazing repair material 3 is integrally bonded to the repairing portion to repair the repairing portion, the brazing repair material 3 comprises a mixture of non-molten alloy powder having a composition similar to that of the base material 1 and molten alloy powder which is melted at a temperature of the diffusion heat treatment, and the molten alloy powder is brazing repairing alloy consisting of 0.001 to 0.05 mass % of C, 2 to 5 mass % of Si, 10 to 25 mass % of Cr, 15 to 25 mass % of Co, 1 to 5 mass % of B, and balance of Ni, and excluding Al. With this configuration, a part having a failure such as a crack can restore original characteristics like the inherent base material.
    Type: Application
    Filed: February 17, 2009
    Publication date: April 21, 2011
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Yomei Yoshioka, Toshiaki Fuse, Daizo Saito, Reki Takaku, Kazuhiro Kitayama, Kazutoshi Ishibashi
  • Patent number: 7866020
    Abstract: A method for repairing a crack in an electromechanical rotor (10), including forming a plurality of slots (12) on a periphery of a core portion (11) of an electromechanical rotor (10) along an axial direction thereof; inserting coils into the slots (12), respectively; forming a plurality of wedges for maintaining the coils in the slots (12), respectively; and forming a cut hole (20) at the core portion (11) from an outer surface of the core portion (11) so as to remove at least a deeper area of a crack created at the core portion (11) at a contacting surface between the corresponding wedge and the corresponding slot (12).
    Type: Grant
    Filed: December 27, 2006
    Date of Patent: January 11, 2011
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Koji Matsuyama, Hideki Chiba, Hiromichi Ito, Yomei Yoshioka, Kazuhiro Saito, Yasuo Kabata, Ryoji Nagano, Hiroaki Koinuma, Kaname Hirai, Toshio Kitajima
  • Publication number: 20100158682
    Abstract: A Ni-based alloy for a casting part of a steam turbine having excellent high temperature strength, castability and weldability includes, in percentage by mass, 0.01 to 0.15 of C, 18 to 28 of Cr, 10 to 15 of Co, 8 to 12 of Mo, 1.5 to 2 of Al, 0.1 to 3 of Ti, 0.001 to 0.006 of B, 0.1 to 0.7 of Ta, and the balance of Ni plus unavoidable impurities.
    Type: Application
    Filed: December 8, 2009
    Publication date: June 24, 2010
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Kuniyoshi NEMOTO, Kiyoshi Imai, Yomei Yoshioka, Masayuki Yamada, Shigekazu Miyashita, Takeo Suga, Takeo Takahashi, Kazutaka Ikeda
  • Publication number: 20100158681
    Abstract: A Ni-based alloy for a forged part of a steam turbine having excellent high temperature strength, forgeability and weldability includes, in percentage by mass, 0.01 to 0.15 of C, 18 to 28 of Cr, 10 to 15 of Co, 8 to 12 of Mo, 1.5 to 2 of Al, 0.1 to 3 of Ti, 0.001 to 0.006 of B, 0.1 to 0.7 of Ta, and the balance of Ni plus unavoidable impurities.
    Type: Application
    Filed: December 8, 2009
    Publication date: June 24, 2010
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Kuniyoshi NEMOTO, Kiyoshi IMAI, Yomei YOSHIOKA, Masayuki YAMADA, Shigekazu MIYASHITA, Takeo SUGA, Takeo TAKAHASHI, Kazutaka IKEDA
  • Patent number: 7711664
    Abstract: An object of the present invention is to control crack propagation, either by predicting shaft dovetail crack propagation with high accuracy, or by determining operation conditions under which the crack does not extend. The crack propagation prediction system includes an operation processing unit, an interface unit, and a memory unit. The operation processing unit includes a stress calculation unit that calculates the mean stress generated in the shaft dovetail, a factor range calculation unit that calculates the stress intensity factor range for the crack in the shaft dovetail, and a crack propagation amount calculation unit that calculates an amount of the shaft dovetail crack propagation for an arbitrary time period, from the obtained mean stress and the stress intensity factor range, an operation pattern, an operation time, and data on the crack.
    Type: Grant
    Filed: December 27, 2006
    Date of Patent: May 4, 2010
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Kazuhiro Saito, Yomei Yoshioka, Koji Matsuyama, Hiromichi Ito, Ryoji Nagano, Hiroaki Koinuma
  • Patent number: 7632363
    Abstract: A method for refurbishing service-degraded gas turbine component can recover the microstructure of the alloy of the gas turbine component, whose material is deteriorated or damaged after its operation, to the extent that is equivalent or more than the characteristic at the time of its manufacture. The method comprises performing a recovery heat treatment, performing a solution heat treatment, and performing an aging heat treatment. The recovery heat treatment heat-treats the component under a predetermined pressure, which is higher than normal pressure, wherein the temperature of the component is increased to a predetermined temperature under the predetermined pressure. The solution heat treatment is processed under reduced pressure or inert gas atmosphere after the recovery heat treatment. The aging heat treatment is processed under reduced pressure or inert gas atmosphere after the recovery heat treatment.
    Type: Grant
    Filed: June 10, 2005
    Date of Patent: December 15, 2009
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yomei Yoshioka, Daizo Saito, Junji Ishii, Yoshihiro Aburatani
  • Publication number: 20090285692
    Abstract: An Ni-base alloy for a turbine rotor of a steam turbine contains in percent by weight C: 0.01 to 0.15, Cr: 15 to 28, Co: 10 to 15, Mo: 8 to 12, Al: 1.5 to 2, Ti: 0.1 to 0.6, B: 0.001 to 0.006, Re: 0.5 to 3, and the balance of Ni and unavoidable impurities.
    Type: Application
    Filed: March 13, 2009
    Publication date: November 19, 2009
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Kuniyoshi NEMOTO, Kiyoshi IMAI, Yomei YOSHIOKA, Masayuki YAMADA, Reki TAKAKU, Shigekazu MIYASHITA, Takeo SUGA, Takeo TAKAHASHI, Kenichi OKUNO, Akihiro TAKAKUWA
  • Publication number: 20090242418
    Abstract: The present invention provides a coating method, in which a composite coating layer is formed on a surface of an alloy base member by utilizing a rotary electrode device. The coating method includes the steps of: preparing an electrolytic solution containing A ion wherein A is Co or Ni; preparing a MCrAlY powder wherein M denotes at least one element selected from the group consisting of Ni and Co, and the MCrAlY powder contains at least Ni when A is Co or the MCrAlY powder contains at least Co when A is Ni; preparing a dispersion liquid by dispersing the MCrAlY powder into the electrolytic solution; immerging the cylindrical rotary electrode and the alloy base member into the dispersion liquid; and electrolyzing the surface of the alloy base member while the cylindrical rotary electrode covered with the nonwoven fabric layer is rolled on the on the surface of the alloy base member thereby to form the composite coating layer onto the surface of the alloy base member.
    Type: Application
    Filed: March 24, 2009
    Publication date: October 1, 2009
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Masahiro Saito, Yomei Yoshioka, Kazuhiro Kitayama, Hiroaki Okamoto, Yoshiaki Sakai
  • Publication number: 20090074584
    Abstract: A Nickel-based alloy for a turbine rotor of a steam turbine contains C: 0.01 to 0.15, Cr: 18 to 28, Co: 10 to 15, Mo: 8 to 12, Al: 1.5 to 2, Ti: 0.1 to 0.6, B: 0.001 to 0.006, Ta: 0.1 to 0.7 in % by weight, and the remaining portion is composed of Ni and unavoidable impurities. The Nickel-based alloy is composed of the above-stated chemical composition range, and thereby, a mechanical strength improves while maintaining forgeability as same as a conventional steel.
    Type: Application
    Filed: September 15, 2008
    Publication date: March 19, 2009
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Kuniyoshi Nemoto, Kiyoshi Imai, Yomei Yoshioka, Masayuki Yamada, Reki Takaku, Takeo Suga, Masafumi Fukuda, Kenichi Okuno, Akihiro Takakuwa
  • Publication number: 20070269608
    Abstract: A to-be-repaired damaged part, which occurs in a rotor, is removed and shaped by machining or grinding. The shaped surface, from which the to-be-repaired damaged part is removed in the step, is roughened by a blasting process. A coating is formed on the surface, which is roughened in the step, by a high-velocity flame spray apparatus. The coating, which is formed in the step, is finished by machining or polishing. A defect inspection is performed to check presence/absence of a defect. A dimensional/quality inspection is performed for the part repaired in the step.
    Type: Application
    Filed: February 23, 2007
    Publication date: November 22, 2007
    Inventors: Masahiro Saito, Yomei Yoshioka, Hideki Chiba, Shinji Takahashi, Kiyoshi Miyaike, Shozo Murata
  • Publication number: 20070169334
    Abstract: A method for removing a crack in an electromechanical rotor, including: forming a plurality of slots on a periphery of a core portion of an electromechanical rotor along an axial direction thereof; inserting coils into the slots, respectively; forming a plurality of wedges for maintaining the coils in the slots, respectively; and forming a cut hole at at least a part of the core portion from an outer surface of the core portion toward the side of a center axis thereof so as to contain a crack along a circumferential direction thereof.
    Type: Application
    Filed: December 27, 2006
    Publication date: July 26, 2007
    Inventors: Koji Matsuyama, Hideki Chiba, Hiromichi Ito, Yomei Yoshioka, Kazuhiro Saito, Yasuo Kabata, Ryoji Nagano, Hiroaki Koinuma, Kaname Hirai, Toshio Kitajima
  • Publication number: 20070172357
    Abstract: An object of the present invention is to control crack propagation, either by predicting shaft dovetail crack propagation with high accuracy, or by determining operation conditions under which the crack does not extend. The crack propagation prediction system includes an operation processing unit, an interface unit, and a memory unit. The operation processing unit includes a stress calculation unit that calculates the mean stress generated in the shaft dovetail, a factor range calculation unit that calculates the stress intensity factor range for the crack in the shaft dovetail, and a crack propagation amount calculation unit that calculates an amount of the shaft dovetail crack propagation for an arbitrary time period, from the obtained mean stress and the stress intensity factor range, an operation pattern, an operation time, and data on the crack.
    Type: Application
    Filed: December 27, 2006
    Publication date: July 26, 2007
    Inventors: Kazuhiro Saito, Yomei Yoshioka, Koji Matsuyama, Hiromichi Ito, Ryoji Nagano, Hiroaki Koinuma
  • Publication number: 20070169335
    Abstract: A method for repairing a crack in an electromechanical rotor (10), including forming a plurality of slots (12) on a periphery of a core portion (11) of an electromechanical rotor (10) along an axial direction thereof; inserting coils into the slots (12), respectively; forming a plurality of wedges for maintaining the coils in the slots (12), respectively; and forming a cut hole (20) at the core portion (11) from an outer surface of the core portion (11) so as to remove at least a deeper area of a crack created at the core portion (11) at a contacting surface between the corresponding wedge and the corresponding slot (12).
    Type: Application
    Filed: December 27, 2006
    Publication date: July 26, 2007
    Inventors: Koji Matsuyama, Hideki Chiba, Hiromichi Ito, Yomei Yoshioka, Kazuhiro Saito, Yasuo Kabata, Ryoji Nagano, Hiroaki Koinuma, Kaname Hirai, Toshio Kitajima
  • Publication number: 20070039177
    Abstract: A method of regenerating gas-turbine stator vane comprising the steps of: grinding the oxidized layer and the cracks 2 formed at surface portion so that a part of the cracks 2 remains; filling an equivalent material and a brazing material 4 into the ground portion, the equivalent material 3 having an equality with the base material 1 for the stator vane, and the brazing material 4 having a melting point lower than that of the equivalent material 3; heat treating the filled portion under pressurized inert gas atmosphere so as to melt the brazing material; performing brazing treatment by diffusing the molten brazing material into the cracked portions. According to the above method, the stator vane occurred with material deterioration and damages or the like due to operation of a gas turbine can be efficiently regenerated to provide a high quality without requiring to completely grinding and removing the cracks including a closed crack formed at surface of the stator vane.
    Type: Application
    Filed: August 1, 2005
    Publication date: February 22, 2007
    Inventors: Yomei Yoshioka, Toshiaki Fuse, Masako Nakahashi, Daizo Saito, Hiroaki Okamoto, Kazutoshi Ishibashi
  • Publication number: 20060016527
    Abstract: A method for refurbishing service-degraded gas turbine component can recover the microstructure of the alloy of the gas turbine component, whose material is deteriorated or damaged after its operation, to the extent that is equivalent or more than the characteristic at the time of its manufacture. The method comprises performing a recovery heat treatment, performing a solution heat treatment, and performing an aging heat treatment. The recovery heat treatment heat-treats the component under a predetermined pressure, which is higher than normal pressure, wherein the temperature of the component is increased to a predetermined temperature under the predetermined pressure. The solution heat treatment is processed under reduced pressure or inert gas atmosphere after the recovery heat treatment. The aging heat treatment is processed under reduced pressure or inert gas atmosphere after the recovery heat treatment.
    Type: Application
    Filed: June 10, 2005
    Publication date: January 26, 2006
    Inventors: Yomei Yoshioka, Daizo Saito, Junji Ishii, Yoshihiro Aburatani