Patents by Inventor Yoshiki Tsunekawa

Yoshiki Tsunekawa 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: 10322446
    Abstract: There is provided a nitrided layer repair method in which a molten metal is pressurized and solidified, and thus a nitrided layer formed on a cavity surface of a mold used to form a casting object is repaired. In the nitrided layer repair method, a nitriding source is applied to the cavity surface, and the cavity surface of the mold is nitrided by heating and pressurizing the cavity surface using the molten metal.
    Type: Grant
    Filed: September 12, 2017
    Date of Patent: June 18, 2019
    Assignees: TOYOTA JIDOSHA KABUSHIKI KAISHA, TETRA CO., LTD, TOYOTA SCHOOL FOUNDATION
    Inventors: Eiji Tabata, Yuichi Furukawa, Yoshiki Tsunekawa, Hiroyuki Matsubara
  • Publication number: 20180085823
    Abstract: There is provided a nitrided layer repair method in which a molten metal is pressurized and solidified, and thus a nitrided layer formed on a cavity surface of a mold used to form a casting object is repaired. In the nitrided layer repair method, a nitriding source is applied to the cavity surface, and the cavity surface of the mold is nitrided by heating and pressurizing the cavity surface using the molten metal.
    Type: Application
    Filed: September 12, 2017
    Publication date: March 29, 2018
    Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota School Foundation, TETRA Co., Ltd.
    Inventors: Eiji TABATA, Yuichi FURUKAWA, Yoshiki TSUNEKAWA, Hiroyuki MATSUBARA
  • Patent number: 9644255
    Abstract: A surface treatment method for a metal material is provided which includes applying diluted sulfuric acid to a surface of the metal material that is composed primarily of iron, performing a heat treatment on the metal material in the presence of at least one of CO, CO2 and organic gas under nitriding conditions under which a nitrided layer is formed in a superficial layer of the metal material after the application of the diluted sulfuric acid to form a carbon film which includes at least one of carbon nanocoils, carbon nanotubes and carbon nanofilaments on a surface of the nitrided layer of the metal material.
    Type: Grant
    Filed: April 12, 2012
    Date of Patent: May 9, 2017
    Assignees: TOYOTA JIDOSHA KABUSHIKI KAISHA, TOYOTA SCHOOL FOUNDATION, MEC INTERNATIONAL CO. LTD.
    Inventors: Yuichi Furukawa, Masahiro Okumiya, Yoshiki Tsunekawa, Nao Kumemoto, Fumio Kawahara, Katsuhiro Takami
  • Patent number: 8992705
    Abstract: During a process of cooling a hypereutectic Al—Si alloy melt, ultrasonic vibration is applied to the melt to crystallize primary crystal ?-Al using, in combination, an ultrasonic transducer (8) that generates the ultrasonic vibration, an ultrasonic horn (7) that is connected to the ultrasonic transducer (8) and transmits the ultrasonic vibration in a specified direction, a treatment vessel (2) that holds the melt and is in contact with the ultrasonic horn (7), and a treatment vessel fixing device (3) that fixes the treatment vessel (2) by pressing the treatment vessel toward the ultrasonic horn (7).
    Type: Grant
    Filed: August 2, 2010
    Date of Patent: March 31, 2015
    Assignees: Toyota Jidosha Kabushiki Kaisha, Toyota School Foundation
    Inventors: Yuichi Furukawa, Yoshiki Tsunekawa
  • Publication number: 20140048182
    Abstract: A surface treatment method for a metal material is provided which includes applying diluted sulfuric acid to a surface of the metal material that is composed primarily of iron, performing a heat treatment on the metal material in the presence of at least one of CO, CO2 and organic gas under nitriding conditions under which a nitrided layer is formed in a superficial layer of the metal material after the application of the diluted sulfuric acid to form a carbon film which includes at least one of carbon nanocoils, carbon nanotubes and carbon nanofilaments on a surface of the nitrided layer of the metal material.
    Type: Application
    Filed: April 12, 2012
    Publication date: February 20, 2014
    Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, MEC INTERNATIONAL CO. LTD., TOYOTA SCHOOL FOUNDATION
    Inventors: Yuichi Furukawa, Masahiro Okumiya, Yoshiki Tsunekawa, Nao Kumemoto, Fumio Kawahara, Katsuhiro Takami
  • Publication number: 20120168040
    Abstract: During a process of cooling a hypereutectic Al—Si alloy melt, ultrasonic vibration is applied to the melt to crystallize primary crystal ?-Al using, in combination, an ultrasonic transducer (8) that generates the ultrasonic vibration, an ultrasonic horn (7) that is connected to the ultrasonic transducer (8) and transmits the ultrasonic vibration in a specified direction, a treatment vessel (2) that holds the melt and is in contact with the ultrasonic horn (7), and a treatment vessel fixing device (3) that fixes the treatment vessel (2) by pressing the treatment vessel toward the ultrasonic horn (7).
    Type: Application
    Filed: August 2, 2010
    Publication date: July 5, 2012
    Applicants: TOYOTA SCHOOL FOUNDATION, TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Yuichi Furukawa, Yoshiki Tsunekawa
  • Patent number: 6253831
    Abstract: A casting process for producing a metal matrix composite comprising a first phase or a matrix of a metal or metal alloy and a second phase of particles dispersed in the matrix, comprising the steps of: preparing a melt of the metal or metal alloy in a vessel; feeding the particles to the melt; applying ultrasonic vibration to the melt while electromagnetically stirring the melt; and then causing solidification of the melt. The process preferably further comprises the step of applying ultrasonic vibration to the melt while electromagnetically stirring the melt during the solidification of the melt.
    Type: Grant
    Filed: January 20, 1998
    Date of Patent: July 3, 2001
    Assignees: Toyota Jidosha Kabushiki Kaisha, Toyota School Foundation
    Inventors: Yoshikazu Genma, Yoshiki Tsunekawa, Masahiro Okumiya, Naotake Mohri
  • Patent number: 6221230
    Abstract: A method and apparatus for forming a layer of plating on a base material and a method for manufacturing a three dimensional object. The plating apparatus includes a nozzle for delivering a stream of plating fluid and an electric source for applying a voltage between the base material and the nozzle. The nozzle has an outer wall and a stem located at its center. The nozzle delivers plating fluid from the opening of the nozzle in an annular manner to produce a stream that has a substantially uniform flow velocity when the stream hits the base material. In an another embodiment, the nozzle has surrounding conduit for conducting air. The air increases the velocity of a peripheral portion of the stream. To manufacture a three dimensional object, a plating layer is deposited, and the nozzle is moved to form a desired shape while piling the layer.
    Type: Grant
    Filed: May 14, 1998
    Date of Patent: April 24, 2001
    Inventors: Hiromitsu Takeuchi, Masahiro Okumiya, Yoshiki Tsunekawa, Yutaka Kawai
  • Patent number: 6086684
    Abstract: A surface treating is performed by an electric discharge. The electric discharge is generated by applying a voltage between an electrode and a metal workpiece. The electrode is a solid or green compact electrode or the like which is made of a reforming material. The workpiece may be an end mill or the like. Then, a coating layer is formed on a surface of the metal workpiece. Thereafter, a nitriding treatment is performed on the coating layer in a nitriding vessel or the like. Thus, a hard coating layer of better quality is formed on the surface of the workpiece whether a material of the workpiece is steel or hard metal.
    Type: Grant
    Filed: June 2, 1998
    Date of Patent: July 11, 2000
    Assignees: Japan Science and Technology Corporation, Nagao Saito, Naotake Mohri, Mitsubishi Denki Kabushiki Kaisha
    Inventors: Nagao Saito, Naotake Mohri, Yoshiki Tsunekawa, Kohei Shimamoto, Akihiro Goto, Takuji Magara, Yoshihito Imai, Hidetaka Miyake
  • Patent number: 5865976
    Abstract: A method of making a composite structure including at least a plating film disposed on a substrate having at least a surface portion formed from a metallic base material. The method includes the steps of discharging a composite plating solution containing insoluble particles from a nozzle and impacting the composite plating solution on the surface portion of the substrate at a predetermined flow rate. During at least a portion of the discharging and impacting steps, the surface portion of the substrate is abraded with the insoluble particles in the plating solution discharged from the nozzle. A voltage can be applied between the base material and the nozzle, which are electrically connected by the plating solution, to thereby deposit a plating film on the surface portion of the substrate by electroplating.
    Type: Grant
    Filed: January 24, 1997
    Date of Patent: February 2, 1999
    Assignee: Toyoda Gosei Co., Inc.
    Inventors: Hiromitsu Takeuchi, Yoshiki Tsunekawa, Masahiro Okumiya
  • Patent number: 5651872
    Abstract: A composite plating film is prepared from a composite plating solution containing a metal matrix and insoluble particles 4 dispersed therein or deposited therewith. The composite plating film has a non-uniform concentration of insoluble particles along a direction of the thickness of the composite film. The non-uniform concentration is achieved by changing the discharge rate of composite plating solution during deposition of the film on the base material.
    Type: Grant
    Filed: October 6, 1995
    Date of Patent: July 29, 1997
    Assignee: Toyoda Gosei Co., Ltd.
    Inventors: Hiromitsu Takeuchi, Yoshiki Tsunekawa, Masahiro Okumiya
  • Patent number: 4740395
    Abstract: A method of manufacturing a composite material by melt-spraying, comprising the steps of melt-spraying a metal as the main constituent of the composite material onto a base plate and injecting a reinforcing substance comprising discontinuous fibers into the metal melt spray stream upstream of the base plate to effect mixing of the reinforcing substance in the melt-sprayed stream of metal within a temperature range without producing a resultant reaction layer between said metal and said reinforcing substance.
    Type: Grant
    Filed: February 13, 1987
    Date of Patent: April 26, 1988
    Assignees: Yoshiki Tsunekawa, Masahiro Okumiya, Naotake Mohri, Mitsubishi Denki Kabushiki Kaisha
    Inventors: Yoshiki Tsunekawa, Masahiro Okumiya, Naotake Mohri