Patents by Inventor Kyohei MAEDA

Kyohei MAEDA 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: 20240165733
    Abstract: A resistance welding method for joining together a first member and a second member with an element including a head portion and a shaft portion. The method includes: contacting the shaft portion with the first member to stack the element, the first member, and the second member in this order; sandwiching and pressurizing the element, the first member, and the second member with a pair of electrodes while pressurizing at least one of the element or the first member with an external pressurizing jig disposed around at least one electrode of the pair of electrodes that is closer to the element; and melting the first member by energization of the pair of electrodes while maintaining pressurization with the pair of electrodes and the external pressurizing jig so that the element penetrates the first member to weld the element and the second member together.
    Type: Application
    Filed: February 8, 2022
    Publication date: May 23, 2024
    Applicant: KABUSHIKI KAISHA KOBE SEIKO SHO (KOBE STEEL, LTD.)
    Inventors: Kyohei MAEDA, Reiichi SUZUKI
  • Publication number: 20230256541
    Abstract: A method for manufacturing a dissimilar material joint structure by joining a steel material and an aluminum or aluminum alloy material having a low-temperature spray coating made of a metal powder capable of being joined to the steel material on at least a part of a surface of the aluminum or aluminum alloy material. The method includes overlapping the aluminum or aluminum alloy material and the steel material such that the low-temperature spray coating and the steel material face each other and emitting a laser beam from a steel material side. Where a region to be irradiated with the laser beam includes a first region where at least the steel material and the low-temperature spray coating are melted, and a second region where the steel material and the low-temperature spray coating are not melted in a peripheral portion of the first region.
    Type: Application
    Filed: June 28, 2021
    Publication date: August 17, 2023
    Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)
    Inventors: Kyohei MAEDA, Reiichi SUZUKI
  • Publication number: 20230201949
    Abstract: A method for producing a resistance-welded member made of three or more sheets including a plated steel sheet includes: a main energizing by performing energization with a first current value while compressing the steel sheet with a first compressive force to form a nugget; a subsequent energizing by performing, after the main energizing, energization such that the current value gradually decreases from the first current value while compressing with a second compressive force greater than the first compressive force; and holding an electrode while maintaining the second compressive force after the subsequent energizing. The second compressive force and a total sheet thickness, compression rise delay time, and a downslope time and an electrode holding time satisfy respective predetermined conditions.
    Type: Application
    Filed: March 10, 2021
    Publication date: June 29, 2023
    Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)
    Inventors: Kyohei MAEDA, Reiichi SUZUKI, Ryohei IHARA
  • Publication number: 20230191526
    Abstract: A method for producing a resistance-welded member made of three or more sheets including a plated steel sheet that includes: a first energizing with a first current value while compressing the steel sheets with a first compressive force to form a nugget; a subsequent energizing of, after the first energizing, energizing with a second current value smaller than the first current value while compressing the steel sheets with a second compressive force greater than the first compressive force; and holding an electrode by maintaining the second compressive force after the subsequent energization. The second compressive force and a total sheet thickness, the first current value and the second current value, and a subsequent energization time and an electrode holding time satisfy predetermined conditions respectively.
    Type: Application
    Filed: April 12, 2021
    Publication date: June 22, 2023
    Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)
    Inventors: Kyohei MAEDA, Reiichi SUZUKI, Ryohei IHARA
  • Publication number: 20230174385
    Abstract: Provided is a method for producing a lithium-containing solution that allows increasing a content rate of lithium in a solution after an eluting step, and suppressing an amount of an eluted solution used in a process after the eluting step, thus suppressing production cost of lithium. A method for producing a lithium-containing solution includes an adsorption step of bringing a lithium adsorbent obtained from lithium manganese oxide in contact with a low lithium-containing solution to obtain post-adsorption lithium manganese oxide, an eluting step of bringing the post-adsorption lithium manganese oxide in contact with an acid-containing solution to obtain an eluted solution, and a manganese oxidation step of oxidating manganese to obtain a lithium-containing solution with a suppressed manganese concentration. The adsorption step, the eluting step, and the manganese oxidation step are performed in this order, and the acid-containing solution includes the eluted solution with acid added.
    Type: Application
    Filed: March 30, 2022
    Publication date: June 8, 2023
    Applicant: SUMITOMO METAL MINING CO., LTD.
    Inventors: Osamu IKEDA, Masatoshi TAKANO, Satoshi ASANO, Shin-ichi HEGURI, Shin-ya MATSUMOTO, Yohei KUDO, Yusuke SENBA, Kyohei MAEDA
  • Publication number: 20220274199
    Abstract: A method for manufacturing a dissimilar metal joint product including joining a first member made of non-ferrous metal and having an end surface and a first surface adjacent to the end surface and a second member made of steel, the method includes: spraying a metal powder capable of being joined to the second member to the end surface and the first surface of the first member at a low temperature and at a high speed to form a coating to extend over the end surface and the first surface; disposing the first member and the second member such that the coating and the second member are close to or contact with each other; and performing fillet welding between the coating and the second member.
    Type: Application
    Filed: June 29, 2020
    Publication date: September 1, 2022
    Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)
    Inventors: Reiichi SUZUKI, Kyohei MAEDA
  • Publication number: 20220176492
    Abstract: A method for manufacturing a joint structure of dissimilar materials, the method includes: forming a low-temperature thermal spray coating on at least a part of a surface of an aluminum or aluminum alloy material by low-temperature thermal spraying a metal powder of at least one metal selected from the group consisting of pure iron, carbon steel, stainless steel, nickel, a nickel alloy, cobalt, and a cobalt alloy; overlapping the aluminum or aluminum alloy material and a steel material such that the low-temperature thermal spray coating and the steel material face each other; and joining the aluminum or aluminum alloy material and the steel material by laser a welding from a steel material side, in which the joining is performed under welding conditions in which a fusion zone is formed in the steel material, the low-temperature thermal spray coating, and the aluminum or aluminum alloy material.
    Type: Application
    Filed: February 23, 2022
    Publication date: June 9, 2022
    Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)
    Inventors: Kyohei MAEDA, Reiichi SUZUKI
  • Publication number: 20220168835
    Abstract: A method for manufacturing a dissimilar metal joint product includes: spraying a metal powder capable of being joined to a steel material to at least a part of a surface of an aluminum or aluminum-alloy material at a low temperature and at a high speed to form a coating thereon; disposing the aluminum or aluminum-alloy material and the steel material such that the coating and the steel material face each other; and performing brazing using a brazing material or welding using a welding material between the coating and the steel material.
    Type: Application
    Filed: February 25, 2020
    Publication date: June 2, 2022
    Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)
    Inventors: Reiichi SUZUKI, Kyohei MAEDA
  • Publication number: 20220016725
    Abstract: A joint structure, includes: a first member including a high tensile strength steel; and a second member including a high tensile strength steel and superposed on the first member, the first member and the second member being resistance welded to each other, in which a gap between the first member and the second member is between 0 mm and 3 mm, a nugget is not formed at a joint portion between the first member and the second member, or when the nugget is formed at the joint portion between the first member and the second member, a diameter D1 of the nugget satisfies D1<5 mm, and a decarburized layer is provided on at least one of a superposition surface of the first member, on which the second member is superposed, and a superposition surface of the second member, on which the first member is superposed.
    Type: Application
    Filed: September 19, 2019
    Publication date: January 20, 2022
    Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)
    Inventors: Kyohei MAEDA, Reiichi SUZUKI
  • Publication number: 20210404496
    Abstract: A joint structure formed by resistance welding a plurality of superposed steel sheets includes a high tensile strength steel sheet having a tensile strength of at least 590 MPa and containing a chemical component having a carbon equivalent Ceq of at least 0.53%. The high tensile strength steel sheet has a decarburized layer between a base plate and a galvanized layer formed on at least one of a surface on a superposition surface side and a surface on a welding electrode side of the high tensile strength steel sheet, or has a decarburized layer on a superposition surface of the high tensile strength steel sheet adjacent to a galvanized layer of a galvanized steel sheet to be superposed. The decarburized layer has a thickness of at least 5 ?m and at most 200 ?m, and the carbon equivalent Ceq is a value defined by a formula: Ceq=C+Si/24+Mn/6.
    Type: Application
    Filed: October 16, 2019
    Publication date: December 30, 2021
    Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)
    Inventors: Kyohei MAEDA, Reiichi SUZUKI
  • Publication number: 20210394299
    Abstract: A joint structure, includes: a first member including a high tensile strength steel; a second member including a high tensile strength steel and superposed on the first member; a surface soft layer formed on at least one of a superposition surface of the first member, on which the second member is superposed, and a superposition surface of the second member, on which the first member is superposed; a molten-solidified portion formed by melting and solidifying the first member and the second member; and a heat affected zone formed around the molten-solidified portion, in which the surface soft layer has a total thickness of 5 ?m to 200 ?m, and the molten-solidified portion has a carbon amount of 0.21 mass % or more, and a maximum Vickers hardness of the surface soft layer in the heat affected zone is 100 Hv to 500 Hv.
    Type: Application
    Filed: September 19, 2019
    Publication date: December 23, 2021
    Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)
    Inventors: Kyohei MAEDA, Reiichi SUZUKI
  • Publication number: 20210291298
    Abstract: The present invention relates to a method for manufacturing a joint structure of dissimilar materials. The method includes forming a low-temperature thermal spray coating on at least a part of a surface of an aluminum or aluminum alloy material by low-temperature thermal spraying a metal powder of at least one metal selected from the group consisting of ferritic stainless steel, austenitic stainless steel, and ferritic and austenitic two-phase stainless steel, overlapping the aluminum or aluminum alloy material and a steel material such that the low-temperature thermal spray coating and the steel material face each other, and joining the low-temperature thermal spray coating and the steel material by a laser welding from a steel material side.
    Type: Application
    Filed: July 11, 2019
    Publication date: September 23, 2021
    Applicant: KABUSHIKI KAISHA KOBE SEIKO SHO (KOBE STEEL, LTD.)
    Inventors: Kyohei MAEDA, Reiichi SUZUKI
  • Publication number: 20190291202
    Abstract: A joint structure including a first member, a second member superposed on the first member, a steel insertion member, and a welded part formed on an insertion tip of the insertion member. Each of the first member and the second member includes a high tensile strength steel. The steel insertion member is held by the second member in a state of having been inserted toward a superposition surface between the first member and the second member from a surface of the second member opposite the superposition surface. A carbon equivalent Ceq of the insertion member is lower than a carbon equivalent Ceq of the second member, where Ceq=C+Si/30+Mn/20+2P+4S.
    Type: Application
    Filed: May 9, 2017
    Publication date: September 26, 2019
    Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)
    Inventors: Kyohei MAEDA, Tetsu IWASE