Patents by Inventor Hiroyasu Fujii

Hiroyasu Fujii 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: 20220119958
    Abstract: This grain-oriented electrical steel sheet includes a steel sheet, an insulation coating disposed on the steel sheet, and a spinel present at a part on the steel sheet at an interface between the steel sheet and the insulation coating by being fitted into the insulation coating, in which an amount of the spinel is 5 to 50 mg/m2 per unit area of a surface of the steel sheet.
    Type: Application
    Filed: January 16, 2020
    Publication date: April 21, 2022
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Hiroyasu FUJII, Seiki TAKEBAYASHI, Yoshiyuki USHIGAMI, Takashi KATAOKA, Shunsuke OKUMURA
  • Publication number: 20220098694
    Abstract: A method for manufacturing a grain-oriented electrical steel sheet includes: a silicon steel material production process of producing a silicon steel material; a hot rolling process of obtaining a hot rolled sheet by subjecting the silicon steel material to hot rolling; a cold rolling process of obtaining a steel sheet of a final sheet thickness by subjecting the hot rolled sheet to a single cold rolling process or multiple cold rolling processes having intermediate annealing performed between the cold rolling processes; a decarburization annealing process of subjecting the steel sheet to decarburization annealing; and a final annealing process of applying an annealing separator containing alumina as a main component to the steel sheet and subjecting the steel sheet to final annealing. The silicon steel material contains: in terms of mass %, Si: 0.8 to 7.0%; C: 0.085% or less; acid-soluble Al: 0.010 to 0.065%; N: 0.004 to 0.012%; Mn: 1.00% or less; S: 0.050% or less; a total of 0.01 to 0.
    Type: Application
    Filed: January 16, 2020
    Publication date: March 31, 2022
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Yoshiyuki USHIGAMI, Shuichi NAKAMURA, Hiroyasu FUJII, Norikazu FUJII
  • Publication number: 20220102035
    Abstract: A grain-oriented electrical steel sheet according to an aspect of the present invention includes an underlying steel sheet and a tension-insulation coating arranged on the surface of the underlying steel sheet, and a ten-point average roughness RzL in an L direction obtained when the tension-insulation coating is removed from the grain-oriented electrical steel sheet with an alkaline solution, and then the surface of the underlying steel sheet is measured in a rolling direction is 6.0 ?m or less.
    Type: Application
    Filed: January 16, 2020
    Publication date: March 31, 2022
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Shuichi NAKAMURA, Yoshiyuki USHIGAMI, Hiroyasu FUJII
  • Publication number: 20220081749
    Abstract: This manufacturing method of a grain-oriented electrical steel sheet is a manufacturing method of a grain-oriented electrical steel sheet having no forsterite film, in which in a decarburization annealing process, a cold-rolled steel sheet is (i-1) heated at an average heating rate (HR1) of 40 to 500° C./sec in a temperature range of 550° C. or higher and lower than 720° C., (i-2) heated at an average heating rate (HR2), which is 5 to 50° C./sec, in a temperature range of 720° C. to T1° C. (770° C.?T1 (° C.)?900° C.), and (ii) retained at the temperature of T1° C. for 50 to 1000 seconds to make an amount of C 25 ppm or less in an atmosphere of an oxygen partial pressure (P1) which is 0.0010 to 0.20.
    Type: Application
    Filed: January 16, 2020
    Publication date: March 17, 2022
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Shinsuke TAKATANI, Takashi KATAOKA, Yoshiyuki USHIGAMI, Kenichi MURAKAMI, Hiroyasu FUJII, Shingo OKADA, Seiki TAKEBAYASHI
  • Publication number: 20220052570
    Abstract: An adhesively-laminated core for a stator capable of suppressing an iron loss of an electric motor and also having excellent productivity is provided. The adhesively-laminated core for a stator includes a plurality of electrical steel sheets which are stacked on one another and of which both surfaces are coated with insulation coatings, and adhesion parts which are disposed between the electrical steel sheets adjacent to each other in a stacking direction and cause the electrical steel sheets to be adhered to each other. All sets of the electrical steel sheets adjacent to each other in the stacking direction are adhered via the adhesion parts. An adhesive forming the adhesion parts is a two-agent type acrylic-based adhesive (SGA) which includes an acrylic-based compound, an oxidizer, and a reducer and in which a portion of the acrylic-based compound and the oxidizer are assigned to a first agent and the remaining portion of the acrylic-based compound and the reducer are assigned to a second agent.
    Type: Application
    Filed: December 17, 2019
    Publication date: February 17, 2022
    Inventors: Kazutoshi TAKEDA, Hiroyasu FUJII, Shinsuke TAKATANI
  • Publication number: 20220037939
    Abstract: Provided is an electric motor which includes an adhesively-laminated core for a stator having excellent productivity and high mechanical strength and that is thus capable of reducing vibration and noise of an electric motor and suppressing iron loss. The adhesively-laminated core for a stator includes electrical steel sheets laminated on each other and each coated on both sides with an insulation coating, and an adhesion part disposed between the electrical steel sheets adjacent to each other in a stacking direction and configured to cause the electrical steel sheets to be adhered to each other. All sets of the electrical steel sheets adjacent to each other in the stacking direction are adhered by the adhesion part, an adhesive forming the adhesion part includes a fast-curing type adhesive and a thermosetting adhesive, and the adhesion part is partially provided between the electrical steel sheets adjacent to each other in the stacking direction.
    Type: Application
    Filed: December 17, 2019
    Publication date: February 3, 2022
    Inventors: Kazutoshi TAKEDA, Hiroyasu FUJII, Shinsuke TAKATANI
  • Publication number: 20220025228
    Abstract: Provided is an electric motor using a laminated core in which punched electrical steel sheets are adhered to each other with a high adhesion strength. The laminated core includes: a plurality of electrical steel sheets which are stacked on each other and of which both surfaces are coated with an insulation coating; and an adhesion part which is disposed between the electrical steel sheets adjacent to each other in a stacking direction and adheres the electrical steel sheets to each other, wherein all sets of the electrical steel sheets adjacent to each other in the stacking direction are adhered to each other by the adhesion parts, wherein the adhesion parts are provided at a plurality of positions between the electrical steel sheets, and wherein the adhesion part is a layer made of an adhesive containing any one or both of an acrylic resin and an epoxy resin and having an SP value of 7.8 to 10.7 (cal/cm3)1/2.
    Type: Application
    Filed: December 17, 2019
    Publication date: January 27, 2022
    Inventors: Shinsuke TAKATANI, Hiroyasu FUJII, Kazutoshi TAKEDA
  • Publication number: 20220029478
    Abstract: A laminated core includes a plurality of electrical steel sheets which are stacked on each other and of each of which both surfaces are coated with an insulation coating; and an adhesion part which is provided between the electrical steel sheets adjacent in the stacking direction and adheres the electrical steel sheets to each other, wherein an adhesive for forming the adhesion part includes a first phase and a second phase, wherein the adhesion part has a sea-island structure of the first phase which is a sea structure portion and the second phase which is an island structure portion, wherein the first phase contains an epoxy resin, an acrylic resin, and a curing agent, wherein the first phase has an SP value of 8.5 to 10.7 (cal/cm3)1/2, wherein the second phase contains an elastomer, and wherein the second phase has an SP value of 7.5 to 8.4 (cal/cm3)1/2.
    Type: Application
    Filed: December 17, 2019
    Publication date: January 27, 2022
    Inventors: Shinsuke TAKATANI, Hiroyasu FUJII, Kazutoshi TAKEDA
  • Publication number: 20210398734
    Abstract: An adhesively-laminated core includes: a plurality of electrical steel sheets which are stacked on each other and of which both surfaces are coated with an insulation coating; and an adhesion part which is provided between the electrical steel sheets adjacent to each other in a stacking direction and adheres the electrical steel sheets to each other, wherein an adhesive forming the adhesion part contains an organic resin and an inorganic filler, wherein a 50% particle size of the inorganic filler is 0.2 to 3.5 ?m, wherein a 90% particle size of the inorganic filler is 10.0 ?m or less, and wherein an amount of the inorganic filler is 5 to 50 parts by mass with respect to 100 parts by mass of the organic resin.
    Type: Application
    Filed: December 17, 2019
    Publication date: December 23, 2021
    Inventors: Hiroyasu FUJII, Shinsuke TAKATANI, Kazutoshi TAKEDA
  • Publication number: 20210388459
    Abstract: A method for manufacturing a grain-oriented electrical steel sheet includes: a silicon steel material production process of producing a silicon steel material; a hot rolling process of obtaining a hot rolled sheet by subjecting the silicon steel material to hot rolling; a cold rolling process of obtaining a steel sheet having a final sheet thickness by subjecting the hot rolled sheet to a single cold rolling process or to multiple cold rolling processes having intermediate annealing performed between cold rolling processes; a decarburization annealing process of subjecting the steel sheet to decarburization annealing using a decarburization annealing furnace including a heating area and a soaking area; and a final annealing process of applying an annealing separator having alumina as a main component to the steel sheet and subjecting the steel sheet to final annealing, wherein, in the decarburization annealing process, when X represents the Cr content of the silicon steel material in terms of mass %, an oxida
    Type: Application
    Filed: January 16, 2020
    Publication date: December 16, 2021
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Yoshiyuki USHIGAMI, Shuichi NAKAMURA, Hiroyasu FUJII
  • Publication number: 20210381072
    Abstract: [Problem] To provide: a coating liquid for forming an insulation coating for grain-oriented electrical steel sheets, which enables the achievement of excellent coating properties including high coating tension and excellent corrosion resistance even without using a chromium compound; a grain-oriented electrical steel sheet; and a method for producing a grain-oriented electrical steel sheet. [Solution] A coating liquid for forming an insulation coating for grain-oriented electrical steel sheets, which contains boric acid and hydrated silicate particles containing aluminum.
    Type: Application
    Filed: October 2, 2019
    Publication date: December 9, 2021
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Shuichi YAMAZAKI, Shinsuke TAKATANI, Hiroyasu FUJII, Kazutoshi TAKEDA
  • Patent number: 11189407
    Abstract: A grain-oriented electrical steel sheet includes: a steel sheet; and an amorphous oxide layer that is formed on the steel sheet, in which a glossiness of a surface is 150% or higher.
    Type: Grant
    Filed: July 13, 2018
    Date of Patent: November 30, 2021
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Shinsuke Takatani, Yoshiyuki Ushigami, Hiroyasu Fujii, Shuichi Nakamura, Takeshi Imai
  • Publication number: 20210317542
    Abstract: In a base sheet for a grain-oriented electrical steel sheet of the present invention, an amount of surface oxygen x per one surface of the base sheet and a value y of a peak (?R/R0 @1250 cm?1) of SiO2 on the surface of the base sheet obtained by infrared reflection spectroscopy satisfy y?1500x2.5 and y?0.24. A method of manufacturing the base sheet for a grain-oriented electrical steel sheet of the present invention includes: adjusting the amount of surface oxygen per one surface of a final-annealed grain-oriented silicon steel sheet to more than 0.01 g/m2 and 0.05 g/m2 or less, or more than 0.05 g/m2 and 0.10 g/m2 or less; and performing thermal oxidation annealing in an atmosphere in which an oxidation potential represented by a ratio PH2O/PH2 of water vapor pressure to hydrogen pressure is 0.0081 or less in a case where the amount of surface oxygen is more than 0.01 g/m2 and 0.05 g/m2 or less, or in an atmosphere in which the oxidation potential is 0.
    Type: Application
    Filed: July 13, 2018
    Publication date: October 14, 2021
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Shuichi NAKAMURA, Seiki TAKEBAYASHI, Yoshiyuki USHIGAMI, Shinsuke TAKATANI, Hiroyasu FUJII
  • Publication number: 20210272728
    Abstract: A grain oriented electrical steel sheet includes: by mass %, 0.010% or less of C; 2.50 to 4.00% of Si; 0.0010 to 0.0100% of acid soluble Al; 0.012% or less of N; 1.00% or less of Mn; 0.02% or less of S; and a balance consisting of Fe and impurities, and has a tension-insulation coating at steel sheet surface and a SiO2 intermediate oxide film layer with an average thickness of 1.0 nm to 1.0 ?m at an interface between the tension-insulation coating and the steel sheet surface. In the grain oriented electrical steel, a time differential curve fM(t) of a glow discharge optical emission spectrum of a metallic element M (Al) in the SiO2 intermediate oxide film layer satisfies a predetermined condition.
    Type: Application
    Filed: July 13, 2018
    Publication date: September 2, 2021
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Takashi KATAOKA, Yoshiyuki USHIGAMI, Shuichi NAKAMURA, Hiroyasu FUJII, Yoichi ZAIZEN
  • Patent number: 11060159
    Abstract: A grain-oriented electrical steel sheet according to an aspect of the present invention includes: a steel sheet 1; an intermediate layer 4 containing Si and O, arranged on the steel sheet; and an insulation coating 3 arranged on the intermediate layer 4, in which the intermediate layer 4 contains a metal phosphide 5, a thickness of the intermediate layer 4 is 4 nm or more, and an abundance of the metal phosphide 5 present is 1% to 30% by cross-sectional area fraction in a cross section of the intermediate layer 4.
    Type: Grant
    Filed: July 13, 2018
    Date of Patent: July 13, 2021
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Seiki Takebayashi, Shuichi Nakamura, Hiroyasu Fujii, Yoshiyuki Ushigami
  • Publication number: 20210123115
    Abstract: A grain oriented electrical steel sheet includes: by mass %, 0.010% or less of C; 2.50 to 4.00% of Si; 0.010% or less of acid soluble Al; 0.012% or less of N; 1.00% or less of Mn; 0.020% or less of S; and a balance consisting of Fe and impurities, and has a tension-insulation coating at steel sheet surface and a SiO2 intermediate oxide film layer with an average thickness of 1.0 nm to 1.0 ?m at an interface between the tension-insulation coating and the steel sheet surface. In the grain oriented electrical steel, when a surface of the intermediate oxide film layer is analyzed by an infrared reflection spectroscopy, a peak intensity IA at 1250 cm?1 and a peak intensity IB at 1200 cm?1 satisfy IB/IA?0.010.
    Type: Application
    Filed: July 13, 2018
    Publication date: April 29, 2021
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Takashi KATAOKA, Yoshiyuki USHIGAMI, Shuichi NAKAMURA, Hiroyasu FUJII, Shunsuke OKUMURA
  • Publication number: 20210002738
    Abstract: In the present invention, there is provided a coating liquid for forming an insulation coating for a grain-oriented electrical steel sheet, including: a solvent; and one or two more layered clay mineral powders having a specific surface area of 20 m2/g or more. In addition, in the present invention, there is provided a grain-oriented electrical steel sheet including: a base metal; and an insulation coating provided on a surface of the base metal, in which the insulation coating contains SiO2, and one or two of Al2O3 and MgO, and has a porosity of 10% or less.
    Type: Application
    Filed: March 19, 2019
    Publication date: January 7, 2021
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Shuichi YAMAZAKI, Kazutoshi TAKEDA, Hiroyasu FUJII, Toru NAGAI
  • Publication number: 20200354582
    Abstract: A coating solution for forming an insulating film for a grain-oriented electrical steel sheet which contains one or more types of hydrous silicate powders having an average particle size of 2 ?m or less, and one or more types of phosphoric acids and phosphates satisfying a relation of ?niMi/?Pi?0.5, and satisfies (Formula 1). 1.5?(?niMi+?n?jM?j)/?Pi?15 . . . (Formula 1) (P represents the number of moles of phosphorus, M represents the number of moles of metal ions derived from the phosphate, n represents the valence of the metal ions derived from the phosphate, i represents the number of types of phosphates, M? represents the number of moles of metal elements in the hydrous silicate, n? represents the valence of the metal elements in the hydrous silicate, and j represents the number of types of hydrous silicates).
    Type: Application
    Filed: November 13, 2018
    Publication date: November 12, 2020
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Shuichi YAMAZAKI, Hiroyasu FUJII, Kazutoshi TAKEDA
  • Patent number: 10706998
    Abstract: An electrical steel sheet has an insulation coating on a steel sheet surface. The insulation coating includes: a binder consisting of 100 parts by mass of a metal phosphate and 1 to 50 parts by mass of an organic resin having an average particle size of 0.05 to 0.50 ?m; and a carboxylic acid-containing compound with a carbon number of 2 to 50 in an amount of 0.1 to 10.0 parts by mass based on 100 parts by mass of solids content of the binder. The organic resin is at least one selected from the group consisting of acrylic resins, epoxy resins, and polyester resins. The insulation coating of this electrical steel sheet shows good edge corrosion resistance after blanking.
    Type: Grant
    Filed: February 15, 2016
    Date of Patent: July 7, 2020
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Kazutoshi Takeda, Hiroyasu Fujii, Masaru Takahashi, Shuichi Yamazaki, Hiroki Hori
  • Publication number: 20200203047
    Abstract: A grain-oriented electrical steel sheet includes: a steel sheet; and an amorphous oxide layer that is formed on the steel sheet, in which a glossiness, of a surface is 150% or higher.
    Type: Application
    Filed: July 13, 2018
    Publication date: June 25, 2020
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Shinsuke TAKATANI, Yoshiyuki USHIGAMI, Hiroyasu FUJII, Shuichi NAKAMURA, Takeshi IMAI