Patents by Inventor Hideyuki Hamamura
Hideyuki Hamamura 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).
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Publication number: 20240286219Abstract: A laser processing device includes: a laser light source unit that irradiates, with laser light, a surface of a steel sheet conveyed in a predetermined conveyance direction; a first nozzle that injects gas toward an irradiation site of the laser light, parallel to an optical axis direction of the laser light; and a dust collection mechanism unit that is provided only at one of an upstream side or a downstream side of the irradiation site, in the conveyance direction, and that collects, from a dust collection port, laser sputter generated from the irradiation site.Type: ApplicationFiled: April 28, 2022Publication date: August 29, 2024Inventors: Yoshihiro YAMADA, Takeshi IMAI, Dairi YAJIMA, Hideyuki HAMAMURA, Yoshiaki HIROTA
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Patent number: 12031191Abstract: This grain-oriented electrical steel sheet includes a base steel sheet, a forsterite-based primary film disposed on a surface of the base steel sheet, and a phosphate-based tension-imparting film containing no chromium, which is disposed on a surface of the primary film. In a case where a Ti content and a S content are respectively expressed as XTi and XS, by mass %, the forsterite-based primary film satisfies Expression (1) and Expression (2). A strain-introduced magnetic domain control is performed on the grain-oriented electrical steel sheet 0.10?XTi/XS?10.00??Expression (1) XTi+XS?0.10 mass %.Type: GrantFiled: December 24, 2019Date of Patent: July 9, 2024Assignee: NIPPON STEEL CORPORATIONInventors: Satoshi Arai, Hideyuki Hamamura, Kazutoshi Takeda, Takeo Aramaki, Hirotoshi Tada
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Publication number: 20240177901Abstract: This grain-oriented electrical steel sheet includes a base steel sheet, a glass coating formed on the base steel sheet, and a tension-applied insulation coating formed on the glass coating, in which, in the base steel sheet, a plurality of linear strain regions that extend continuously or intermittently in a direction intersecting with a rolling direction are present, the plurality of linear strain regions are each 210 ?m or less in width in the rolling direction, the plurality of linear strain regions are parallel to each other, intervals of linear strain regions adjacent to each other in the rolling direction are 10 mm or less, and magnetostriction ?0-pb in a unit of ?m/m when the grain-oriented electrical steel sheet is excited up to 1.7 T and magnetostriction ?0-pa in a unit of ?m/m when the grain-oriented electrical steel sheet is heat-treated at 800° C. for 4 hours and then excited up to 1.7 T satisfy 0.02??0-pb??0-pa?0.20.Type: ApplicationFiled: March 28, 2022Publication date: May 30, 2024Applicant: NIPPON STEEL CORPORATIONInventors: Masataka IWAKI, Takashi KATAOKA, Tomohito TANAKA, Hideyuki HAMAMURA
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Publication number: 20240177899Abstract: This grain-oriented electrical steel sheet includes a base steel sheet having a predetermined chemical composition, a glass coating formed on the base steel sheet, and a tension-applied insulation coating formed on the glass coating, on a front surface of the base steel sheet, a plurality of linear strains that extend continuously or intermittently in a direction intersecting with a rolling direction are present, intervals p in the rolling direction of the plurality of linear strains adjacent to each other are 3.0 to 9.0 mm, widths of the linear strains are 10 to 250 ?m, and, in an X-ray topographic spectrum in a range of 1.50 mm in the rolling direction that is obtained from an X-ray topographic image of the front surface and includes the linear strain at a center, a full width at half maximum of a peak of the X-ray topographic spectrum including a maximum value of a spectral intensity is 0.02 mm or more and 0.10 mm or less.Type: ApplicationFiled: March 28, 2022Publication date: May 30, 2024Applicant: NIPPON STEEL CORPORATIONInventors: Takashi KATAOKA, Tomohito TANAKA, Masataka IWAKI, Kazutoshi TAKEDA, Hideyuki HAMAMURA
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Publication number: 20240150874Abstract: This grain-oriented electrical steel sheet includes a base steel sheet, a glass coating formed on the base steel sheet, and a tension-applied insulation coating formed on the glass coating, in the base steel sheet, a plurality of linear strains that extend continuously or intermittently in a direction intersecting with a rolling direction are present, and intervals in the rolling direction of the plurality of linear strains adjacent to each other are 10 mm or less, in a region where the strains are present, a closure domain is present, a length d of the closure domain in a sheet thickness direction from a surface of the base steel sheet is 30 to 60 ?m, a length w in the rolling direction is 200 ?m or less, and a ratio mid of a depth m from the surface of the base steel sheet where a compressive strain in the rolling direction present in the closure domain exhibits a maximum value to the length d is in a range of more than 0.30 and less than 0.90.Type: ApplicationFiled: March 28, 2022Publication date: May 9, 2024Applicant: NIPPON STEEL CORPORATIONInventors: Tomohito TANAKA, Masataka IWAKI, Nobusato MORISHIGE, Takashi KATAOKA, Hideyuki HAMAMURA
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Publication number: 20240139869Abstract: Provided is a laser scanning device that scans a surface of an electrical steel sheet with a laser beam, and includes: a laser beam output unit which irradiates the laser beam; a polygon mirror which has a polygonal shape including a top surface and a bottom surface that are polygonal, in which at least any one surface excluding the top surface and the bottom surface is formed as a mirror, which rotates about an axis serving as a rotation axis and penetrating the top surface and the bottom surface, and which causes the laser beam irradiated from the laser beam output unit to be reflected at the mirror; and an optical system which guides the laser beam reflected at the polygon mirror to the surface of an electrical steel sheet, the rotation axis of the polygon mirror being parallel to the surface of the electrical steel sheet and substantially parallel to a direction in which the laser beam is scanned.Type: ApplicationFiled: March 30, 2022Publication date: May 2, 2024Inventors: Tatsuhiko SAKAI, Hideyuki HAMAMURA
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Patent number: 11970751Abstract: The grain-oriented electrical steel sheet according to the present embodiment is a grain-oriented electrical steel sheet having a base steel sheet (1), an intermediate layer (4) disposed to be in contact with the base steel sheet (1), and an insulation coating (3) disposed to be in contact with the intermediate layer (4). The grain-oriented electrical steel sheet according to the present embodiment includes a surface of the base steel sheet (1) having a strain region (D) which extends in a direction intersecting a rolling direction of the base steel sheet (1), and a crystalline phosphorus oxide M2P4O13 present in the insulation coating (3) on the strain region (D) in a cross-sectional view of a surface parallel to the rolling direction and a sheet thickness direction of the base steel sheet (1). (M means at least one or both of Fe and Cr.Type: GrantFiled: January 16, 2020Date of Patent: April 30, 2024Assignee: NIPPON STEEL CORPORATIONInventors: Yoshiyuki Ushigami, Shinji Yamamoto, Hideyuki Hamamura, Takashi Kataoka, Shunsuke Okumura
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Patent number: 11898215Abstract: The grain-oriented electrical steel sheet according to the present invention is a grain-oriented electrical steel sheet having a base steel sheet (1), an intermediate layer (4) disposed to be in contact with the base steel sheet (1), and an insulation coating (3) disposed to be in contact with the intermediate layer (4), and the grain-oriented electrical steel sheet includes a surface of the base steel sheet (1) having a groove (G) which extends in a direction intersecting a rolling direction of the base steel sheet (1), in which in a cross-sectional view of a plane parallel to the rolling direction and a sheet thickness direction of the base steel sheet (1), when a region between end portions of the groove (G) is defined as a groove part (RG), an average thickness of the intermediate layer (4) of the groove part (RG) is 0.5 times or more and 3.Type: GrantFiled: January 16, 2020Date of Patent: February 13, 2024Assignee: NIPPON STEEL CORPORATIONInventors: Yoshiyuki Ushigami, Shinji Yamamoto, Fumiaki Takahashi, Hideyuki Hamamura, Shinsuke Takatani, Masaru Takahashi
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Patent number: 11697856Abstract: A grain-oriented electrical steel sheet according to the present invention includes a base steel sheet having plural grooves on a surface and a glass film formed on the surface of the base steel sheet.Type: GrantFiled: February 6, 2019Date of Patent: July 11, 2023Assignee: NIPPON STEEL CORPORATIONInventors: Fumiaki Takahashi, Hideyuki Hamamura, Satoshi Arai
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Patent number: 11661636Abstract: A method for manufacturing a grain-oriented electrical steel sheet according to an aspect of the present invention includes a step of obtaining a hot-rolled steel sheet by carrying out hot rolling on a slab containing a predetermined component composition with a remainder including Fe and impurities, a step of obtaining a hot-rolled annealed sheet by carrying out hot-rolled sheet annealing as necessary, a step of carrying out pickling to obtain a pickled sheet, a step of carrying out cold rolling to obtain a cold-rolled steel sheet, a step of carrying out primary recrystallization annealing, a step of applying an annealing separating agent including MgO to a surface and then carrying out final annealing to obtain a final-annealed sheet, and a step of applying an insulating coating and then carrying out flattening annealing.Type: GrantFiled: March 19, 2019Date of Patent: May 30, 2023Assignee: NIPPON STEEL CORPORATIONInventors: Nobusato Morishige, Takashi Kataoka, Haruhiko Atsumi, Yasuhiro Mayumi, Toshiya Takechi, Naoto Masumitsu, Tomoya Suenaga, Masamitsu Kubota, Hideyuki Hamamura, Kazuhiko Fukutani
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Patent number: 11651878Abstract: A grain-oriented electrical steel sheet according to the present invention has a steel sheet surface provided with grooves and includes two or more broken lines including the grooves having a length of 5 to 10 mm on a straight line intersecting a rolling direction on the steel sheet surface. In each of the broken lines including the grooves, the grooves are arranged at equal intervals, and a ratio of the length of the groove to a length of a non-groove is in a range of 1:1 to 1.5:1.Type: GrantFiled: January 31, 2019Date of Patent: May 16, 2023Assignee: NIPPON STEEL CORPORATIONInventors: Hisashi Mogi, Fumiaki Takahashi, Hideyuki Hamamura, Satoshi Arai
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Patent number: 11551838Abstract: A grain-oriented electrical steel sheet according to the present invention has a steel sheet surface provided with grooves. An average protrusion height of the surface protrusion extending along a longitudinal direction of the groove is more than 5 ?m and not more than 10 ?m. When the surface protrusion is viewed in a cross section including the longitudinal direction of the groove and a normal direction of the steel sheet surface, the surface protrusion includes specific portions each having a height of 50% or more with respect to a height of each peak point appearing on a profile line of the surface protrusion. In the longitudinal direction of the groove, the total length of the specific portions is a length of 30% or more with respect to an overall length of the surface protrusion.Type: GrantFiled: February 8, 2019Date of Patent: January 10, 2023Assignee: NIPPON STEEL CORPORATIONInventors: Satoshi Arai, Hideyuki Hamamura, Shunsuke Okumura, Kimihiko Sugiyama
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Patent number: 11498156Abstract: In a laser processing apparatus for refining magnetic domains of a grain-oriented electromagnetic steel sheet by setting a laser beam to be focused on the grain-oriented electromagnetic steel sheet and scanned in a scanning direction, the laser beam focused on the grain-oriented electromagnetic steel sheet is linearly polarized light, and an angle between a linear polarization direction and the scanning direction is higher than 45° and equal to or lower than 90°.Type: GrantFiled: July 3, 2014Date of Patent: November 15, 2022Assignee: NIPPON STEEL CORPORATIONInventors: Koji Hirano, Hirofumi Imai, Hideyuki Hamamura, Tatsuhiko Sakai
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Patent number: 11393612Abstract: A grain-oriented electrical steel sheet according to the present embodiment is a grain-oriented electrical steel sheet having a groove formed on a surface, in which, in a cross section of the grain-oriented electrical steel sheet orthogonal to the groove, a KAM value is 0.1 or more and 3.0 or less in a region on a central side in a thickness direction of the grain-oriented electrical steel sheet with respect to the groove, the region being surrounded by a square having one side in contact with a groove bottom of the groove and having a length of 50 ?m in each side.Type: GrantFiled: February 26, 2019Date of Patent: July 19, 2022Assignee: NIPPON STEEL CORPORATIONInventors: Hideyuki Hamamura, Satoshi Arai, Takashi Kataoka, Shunsuke Okumura
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Publication number: 20220219262Abstract: A groove processing device (100) that forms a groove in a surface of an object using a laser beam includes: a light source device (11) that outputs the laser beam; a polygon mirror (10) that reflects the laser beam output from the light source device (11); and an optical system that is provided on an optical path of the laser beam reflected from the polygon mirror (10) and includes a condensing portion (13A) which transmits the laser beam reflected from one surface of the polygon mirror (10) so as to be focused on the surface of the object and a non-condensing portion (13B) which is provided outside the condensing portion (13A) and transmits the laser beam reflected from a corner portion, in which two adjacent surfaces of the polygon mirror (10) meet, so as not to be focused on the surface of the object.Type: ApplicationFiled: May 13, 2020Publication date: July 14, 2022Applicant: NIPPON STEEL CORPORATIONInventor: Hideyuki HAMAMURA
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Publication number: 20220219261Abstract: A groove processing device (100) that forms a groove in a surface of an object using laser beams (LB) includes: a light source device (11) that outputs the laser beams (LB); a polygon mirror (10) that reflects the laser beams output from the light source device (11); a condensing optical system that is provided on an optical path of the laser beams (LB) reflected by the polygon mirror (11) and focuses the laser beams (LB); and a shielding plate (35) that is provided between the condensing optical system and the object at a position which blocks some of the laser beams (LB) focused through the condensing optical system and blocks some of the laser beams (LB). Among the laser beams (LB) focused through the condensing optical system, some of the laser beams (LB) that are not blocked by the shielding plate (35) form the groove in the surface of the object at a focus of the laser beams (LB).Type: ApplicationFiled: May 13, 2020Publication date: July 14, 2022Applicant: NIPPON STEEL CORPORATIONInventor: Hideyuki HAMAMURA
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Publication number: 20220127692Abstract: A grain-oriented electrical steel sheet includes: a steel sheet and optionally an insulation coating formed on the steel sheet, in which, in a case where a heat treatment of performing retention at 800° C. for 2 hours is performed, regarding a time-magnetostriction waveform (t?? waveform) when magnetized to 1.7 T, a peak value of a difference waveform obtained by subtracting the time-magnetostriction waveform after the heat treatment from the time-magnetostriction waveform before the heat treatment is 0.01×10?6 or more and 0.20×10?6 or less, and a difference obtained by subtracting an iron, loss before the heat treatment from an iron loss after the heat treatment is 0.03 W/kg or more and 0.17 W/kg or less.Type: ApplicationFiled: January 28, 2020Publication date: April 28, 2022Applicant: NIPPON STEEL CORPORATIONInventors: Satoshi ARAI, Masataka IWAKI, Masato MIZOKAMI, Hideyuki HAMAMURA, Takeo ARAMAKI, Hirotoshi TADA
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Publication number: 20220119907Abstract: The method for manufacturing a grain-oriented electrical steel sheet is a method for manufacturing a grain-oriented electrical steel sheet including a strain region forming process of irradiating the grain-oriented electrical steel sheet having a base steel sheet (1), an intermediate layer (4) disposed to be in contact with the base steel sheet (1), and an insulation coating (3) disposed to be in contact with the intermediate layer (4) with an electron beam and forming a strain region (D) which extends in a direction intersecting a rolling direction of the base steel sheet (1) on a surface of the base steel sheet (1), wherein, in the strain region forming process, a temperature of a central portion of the strain region (D) in the rolling direction of the base steel sheet (1) and an extension direction of the strain region (D) is heated to 800° C. or higher and 2000° C. or lower.Type: ApplicationFiled: January 16, 2020Publication date: April 21, 2022Applicant: NIPPON STEEL CORPORATIONInventors: Satoshi ARAI, Yoshiyuki USHIGAMI, Hideyuki HAMAMURA, Shinji YAMAMOTO, Shunsuke OKUMURA
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Publication number: 20220106658Abstract: The grain-oriented electrical steel sheet according to the present invention is a grain-oriented electrical steel sheet having a base steel sheet (1), an intermediate layer (4) disposed to be in contact with the base steel sheet (1), and an insulation coating (3) disposed to be in contact with the intermediate layer (4), and the grain-oriented electrical steel sheet includes a surface of the base steel sheet (1) having a groove (G) which extends in a direction intersecting a rolling direction of the base steel sheet (1), in which in a cross-sectional view of a plane parallel to the rolling direction and a sheet thickness direction of the base steel sheet (1), when a region between end portions of the groove (G) is defined as a groove part (RG), an average thickness of the intermediate layer (4) of the groove part (RG) is 0.5 times or more and 3.Type: ApplicationFiled: January 16, 2020Publication date: April 7, 2022Applicant: NIPPON STEEL CORPORATIONInventors: Yoshiyuki USHIGAMI, Shinji YAMAMOTO, Fumiaki TAKAHASHI, Hideyuki HAMAMURA, Shinsuke TAKATANI, Masaru TAKAHASHI
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Publication number: 20220090227Abstract: The grain-oriented electrical steel sheet according to the present embodiment is a grain-oriented electrical steel sheet having a base steel sheet (1), an intermediate layer (4) disposed to be in contact with the base steel sheet (1), and an insulation coating (3) disposed to be in contact with the intermediate layer (4). The grain-oriented electrical steel sheet according to the present embodiment includes a surface of the base steel sheet (1) having a strain region (D) which extends in a direction intersecting a rolling direction of the base steel sheet (1), and a crystalline phosphorus oxide M2P4O13 present in the insulation coating (3) on the strain region (D) in a cross-sectional view of a surface parallel to the rolling direction and a sheet thickness direction of the base steel sheet (1). (M means at least one or both of Fe and Cr.Type: ApplicationFiled: January 16, 2020Publication date: March 24, 2022Applicant: NIPPON STEEL CORPORATIONInventors: Yoshiyuki USHIGAMI, Shinji YAMAMOTO, Hideyuki HAMAMURA, Takashi KATAOKA, Shunsuke OKUMURA