Patents by Inventor Tatsuyuki Amago

Tatsuyuki Amago 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).

  • Publication number: 20220111464
    Abstract: A novel spot welding method for steel sheets and an aluminum alloy sheet, includes stacked sheet materials from a pair of opposing electrodes to join the sheet materials by resistance heating. The pair of opposing electrodes are in pressure contact with both outer surfaces of the sheet sets. The sheet sets include at least a first and second steel sheet, and an aluminum alloy sheet stacked in this order. A first energization step forms a molten pool between facing surfaces of the first and second steel sheets without melting the aluminum alloy sheet. A second energization step causes a melting reaction between facing surfaces of the second steel sheet and the aluminum alloy sheet. The first and second steel sheets are joined via a first nugget. The second steel sheet and the aluminum alloy sheet are joined via a second nugget including an intermetallic compound generated by the melting reaction.
    Type: Application
    Filed: July 12, 2021
    Publication date: April 14, 2022
    Applicants: KABUSHIKI KAISHA TOYOTA CHUO KENKYUSHO, TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Hideaki MATSUOKA, Takashi ASADA, Tatsuyuki AMAGO, Kyosuke IZUNO, Koki NAKADA, Tomohiko SEKIGUCHI, Shuhei OGURA
  • Patent number: 11247293
    Abstract: A highly corrosion-resistant spot weldment can be produced at low cost without occurrence of prominent protrusions and the like on the surface. The spot weldment is joined by a nugget formed inside stacked sheet materials through bringing a pair of electrodes arranged opposite to each other into pressure contact with the stacked sheet materials from outside and energizing the stacked sheet materials from the electrodes. The nugget has a diameter that is ?4?t (t: thickness of sheet material) and a flattening level of 3.5 to 8, which is a ratio of diameter to thickness. Both outer surface parts of the sheet materials are free from protrusions formed due to bulging of molten metal. Even when the electrodes are made of a copper alloy, the increased amount of Cu in the outer surface parts is 0.2 mass % or less with respect to the component composition before spot welding.
    Type: Grant
    Filed: September 19, 2019
    Date of Patent: February 15, 2022
    Assignees: KABUSHIKI KAISHA TOYOTA CHUO KENKYUSHO, TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Hideaki Matsuoka, Tatsuyuki Amago, Takashi Asada, Toru Hioki, Manabu Ooga, Shuhei Ogura
  • Publication number: 20200114461
    Abstract: An electrode tip for resistance spot welding includes a main body with tip and base portions. The tip portion has a bottomed and substantially cylindrical shape. The base portion has a substantially cylindrical shape and merges into the tip portion. The main body is made of a copper alloy such as chromium copper. The tip portion has a bottom part and a barrel part. The bottom part has a pressure-contact surface that is not recessed with respect to a workpiece to be pressed. The barrel part has a substantially cylindrical shape and merges into the bottom part. The electrode tip may have an inner diameter ratio (inner diameter of the barrel part to an outer diameter of the base portion) of 0.4 to 0.6, and may also have a bottom thickness ratio (thickness of the bottom part to the outer diameter of the base portion) of 0.15 to 0.5.
    Type: Application
    Filed: September 19, 2019
    Publication date: April 16, 2020
    Applicants: KABUSHIKI KAISHA TOYOTA CHUO KENKYUSHO, TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Hideaki MATSUOKA, Tatsuyuki AMAGO, Takashi ASADA, Toru HIOKI, Manabu OOGA, Shuhei OGURA
  • Publication number: 20200114458
    Abstract: A highly corrosion-resistant spot weldment can be produced at low cost without occurrence of prominent protrusions and the like on the surface. The spot weldment is joined by a nugget formed inside stacked sheet materials through bringing a pair of electrodes arranged opposite to each other into pressure contact with the stacked sheet materials from outside and energizing the stacked sheet materials from the electrodes. The nugget has a diameter that is ?4?t (t: thickness of sheet material) and a flattening level of 3.5 to 8, which is a ratio of diameter to thickness. Both outer surface parts of the sheet materials are free from protrusions formed due to bulging of molten metal. Even when the electrodes are made of a copper alloy, the increased amount of Cu in the outer surface parts is 0.2 mass % or less with respect to the component composition before spot welding.
    Type: Application
    Filed: September 19, 2019
    Publication date: April 16, 2020
    Applicants: KABUSHIKI KAISHA TOYOTA CHUO KENKYUSHO, TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Hideaki MATSUOKA, Tatsuyuki AMAGO, Takashi ASADA, Toru HIOKI, Manabu OOGA, Shuhei OGURA
  • Patent number: 7315798
    Abstract: A natural frequency and a calculated mode vector are calculated by using a finite-element method models for analysis which include an object of analysis including a plurality of components and a plurality of elements which are positioned between the components of the object of analysis and indicate a boundary condition between the components, the calculated mode vector having high degree of correlation for an experimental mode vector is extracted and set to a pair, and identifying the boundary condition of the elements based on the extracted calculated mode vector and the natural frequency corresponding to the extracted calculated mode vector.
    Type: Grant
    Filed: July 31, 2003
    Date of Patent: January 1, 2008
    Assignee: Kabushiki Kaisha Toyota Chuo Kenkyusho
    Inventors: Yoshitsugu Goto, Tatsuyuki Amago, Yoshio Kojima, Mizuho Inagaki, Kazuaki Chiku, Toru Matsushima, Keisuke Hayakawa
  • Patent number: 7215334
    Abstract: A method of supporting a user in mechanically analyzing a performance of an object, including the steps of: graphically displaying a generalized model which is constructed as a numerical analysis model for the object such that the generalized model has been generalized with respect to at least configuration of the object, and has been specialized with respect to a function of the object; displaying an item for letting the user enter data in order to define a specialized model which is constructed as a numerical analysis model for the object by specializing the displayed generalized model with respect to the at least configuration thereof; and mechanically analyzing the performance of the object, on the basis of the specialized model defined, a numerical analysis approach predetermined in correspondence with the function of the object, and a numerical analysis condition.
    Type: Grant
    Filed: August 1, 2001
    Date of Patent: May 8, 2007
    Assignee: Kabushiki Kaisha Toyota Chuo Kenkyusho
    Inventors: Hidekazu Nishigaki, Shinji Nishiwaki, Yoshio Kojima, Tatsuyuki Amago, Yasuaki Tsurumi, Noboru Kikuchi
  • Publication number: 20040093195
    Abstract: A natural frequency and a calculated mode vector are calculated by using a finite-element method models for analysis which include an object of analysis including a plurality of components and a plurality of elements which are positioned between the components of the object of analysis and indicate a boundary condition between the components, the calculated mode vector having high degree of correlation for an experimental mode vector is extracted and set to a pair, and identifying the boundary condition of the elements based on the extracted calculated mode vector and the natural frequency corresponding to the extracted calculated mode vector.
    Type: Application
    Filed: July 31, 2003
    Publication date: May 13, 2004
    Applicant: KABUSHIKI KAISHA TOYOTA CHUO KENKYUSHO
    Inventors: Yoshitsugu Goto, Tatsuyuki Amago, Yoshio Kojima, Mizuho Inagaki, Kazuaki Chiku, Toru Matsushima, Keisuke Hayakawa
  • Publication number: 20020016697
    Abstract: A method of supporting a user in mechanically analyzing a performance of an object, including the steps of: graphically displaying a generalized model which is constructed as a numerical analysis model for the object such that the generalized model has been generalized with respect to at least configuration of the object, and has been specialized with respect to a function of the object; displaying an item for letting the user enter data in order to define a specialized model which is constructed as a numerical analysis model for the object by specializing the displayed generalized model with respect to the at least configuration thereof; and mechanically analyzing the performance of the object, on the basis of the specialized model defined, a numerical analysis approach predetermined in correspondence with the function of the object, and a numerical analysis condition.
    Type: Application
    Filed: August 1, 2001
    Publication date: February 7, 2002
    Applicant: KABUSHIKI KAISHA TOYOTA CHUO KENKYUSHO
    Inventors: Hidekazu Nishigaki, Shinji Nishiwaki, Yoshio Kojima, Tatsuyuki Amago, Yasuaki Tsurumi, Noboru Kikuchi