Patents by Inventor Yoshihiko Oda
Yoshihiko Oda 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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Patent number: 10941458Abstract: In the production of a non-oriented electrical stress sheet by hot rolling a slab having a chemical composition comprising, by mass %, C: not more than 0.005, Si: 1.5-6.0, Mn: 0.05-2.0 and P: 0.03-0.15, subjecting to a hot band annealing, if necessary, cold rolling, finish annealing, and forming an insulation coating, the cooling from 700° C. to 500° C. in the finish annealing is conducted in an oxidizing atmosphere with an oxygen potential PH2O/PH2 of not less than 0.001 for 1-300 seconds, whereby P is segregated into the surface of the steel sheet after the finish annealing to obtain a non-oriented electrical steel sheet enhancing a crystal grain growth properties in the stress relief annealing.Type: GrantFiled: January 7, 2016Date of Patent: March 9, 2021Assignee: JFE STEEL CORPORATIONInventors: Hiroaki Nakajima, Tomoyuki Okubo, Tadashi Nakanishi, Yoshihiko Oda
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Patent number: 10927430Abstract: A material for laminated iron cores is used as plural steel sheets to be overlapped with one another and punched when a laminated iron core is manufactured. A surface roughness of the steel sheets forming the material for laminated iron cores is at an arithmetic mean roughness Ra of 0.40 [?m] or less, and a sheet thickness deviation in a sheet width direction of at least a portion used as the laminated iron core is 3 [?m] or less per 500 [mm], the portion being of the steel sheets forming the material for laminated iron cores.Type: GrantFiled: October 13, 2015Date of Patent: February 23, 2021Assignee: JFE Steel CorporationInventors: Masanori Uesaka, Kunihiro Senda, Yoshihiko Oda
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Patent number: 10919081Abstract: A punching method includes: punching out a plurality of electrical steel sheets in a stacked state by a mold, wherein sheet thicknesses of the electrical steel sheets are set to be 0.35 mm or less, a Vickers hardness (test force 1 kg) of the sheets is set to be 150 to 400, and an average crystal grain size of the sheets is set to be 50 to 250 ?m, a clearance of the mold is set to be 7% or more of a minimum sheet thickness of the sheet thicknesses of the electrical steel sheets and equal to or lower than 7% of a total sheet thickness of the electrical steel sheets, and a pressure that a sheet presser of the mold applies to the electrical steel sheets is set to be 0.10 MPa or more.Type: GrantFiled: January 7, 2016Date of Patent: February 16, 2021Assignee: JFE Steel CorporationInventors: Kunihiro Senda, Masanori Uesaka, Yoshihiko Oda
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Patent number: 10910152Abstract: A laminated core manufacturing device includes: an overlapping unit configured to overlap the plurality of laminated core materials conveyed along different conveyance routes; an edge position correction unit configured to align edge positions in a width direction of the plurality of laminated core materials between the plurality of laminated core materials and to correct shift of each edge position of the plurality of laminated core materials with respect to a standard edge position; an uplift prevention unit configured to prevent uplift of the plurality of laminated core materials; and a punching unit configured to punch out the plurality of laminated core materials which are overlapped by the overlapping unit and have been subjected to a process to align the edge positions and to correct shift of the edge positions performed by the edge position correction unit, and a process to prevent the uplift performed by the uplift prevention unit.Type: GrantFiled: August 22, 2016Date of Patent: February 2, 2021Assignee: JFE Steel CorporationInventors: Masanori Uesaka, Kunihiro Senda, Yoshihiko Oda, Yoshihide Kamitani, Yasuhito Shioiri
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Patent number: 10906082Abstract: A Laminated core manufacturing device includes: an overlapping unit configured to overlap the plurality of laminated core materials conveyed along different conveyance routes; an edge aligning unit configured to align edge positions in a width direction of the plurality of laminated core materials between the plurality of laminated core materials; an uplift prevention unit configured to prevent uplift of the plurality of laminated core materials; an edge position correction unit configured to correct the edge positions in the width direction of the plurality of laminated core materials; and a punching unit configured to punch out the plurality of laminated core materials which are overlapped by the overlapping unit and have been subjected to an edge position alignment process performed by the edge aligning unit, an uplift prevention process performed by the uplift prevention unit, and an edge position correction process performed by the edge position correction unit.Type: GrantFiled: August 22, 2016Date of Patent: February 2, 2021Assignee: JFE Steel CorporationInventors: Masanori Uesaka, Kunihiro Senda, Yoshihiko Oda, Yoshihide Kamitani, Yasuhito Shioiri
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Patent number: 10898939Abstract: A punch processing method for a laminated iron core includes sequentially feeding the steel sheets to a mold; and performing a plurality of processes in the mold, the plurality of processes includes fixing the steel sheets being stacked to each other at a first fixing part that is positioned outside a closed curved line corresponding to an outermost periphery of the laminated iron core and a second fixing part that is positioned in a portion that finally serves as the laminated iron core; and performing punch processing on the outermost periphery of the laminated iron core while the steel sheets are stacked.Type: GrantFiled: December 25, 2015Date of Patent: January 26, 2021Assignee: JFE Steel CorporationInventors: Kunihiro Senda, Masanori Uesaka, Yoshihiko Oda
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Patent number: 10822678Abstract: When a non-oriented electrical steel sheet is produced by hot rolling a slab containing, by mass %, C: not more than 0.0050%, Si: 1.5-5.0%, Mn: 0.20-3.0%, sol. Al: not more than 0.0050%, P: not more than 0.2%, S: not more than 0.0050% and N: not more than 0.0040% to form a hot rolled sheet, cold rolling the hot rolled sheet without conducting a hot band annealing and then subjecting to a finish annealing, a compositional ratio of CaO in oxide-based inclusions existing in the slab defined by CaO/(SiO2+Al2O3+CaO) is set to not less than 0.4 and/or a compositional ratio of Al2O3 defined by Al2O3/(SiO2+Al2O3+CaO) is set to not less than 0.3, and a coiling temperature in the hot rolling is set to not lower than 650° C.Type: GrantFiled: November 17, 2015Date of Patent: November 3, 2020Assignee: JFE STEEL CORPORATIONInventors: Tadashi Nakanishi, Hiroaki Nakajima, Tomoyuki Okubo, Yoshihiko Oda
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Publication number: 20200308676Abstract: Provided is a multilayer electrical steel sheet having both low high-frequency iron loss and high magnetic flux density. The multilayer electrical steel sheet has an inner layer and surface layers provided on both sides of the inner layer, in which the surface layers and the inner layer have a predetermined chemical composition, the multilayer electrical steel sheet having: ?Si of 0.5 mass % to 4.0 mass %; ?Al of 0.05 mass % or less; a ratio of ti to t represented by ti/t of from 0.10 to 0.70; a magnetic flux density Bio of 1.3 T or more; and a ratio of B1 to B10 represented by B1/B10 of 0.45 or more; and an iron loss W10/1k in W/kg and the sheet thickness t in mm satisfy the following formula (1): W10/1k?15+140×t??(1).Type: ApplicationFiled: December 10, 2018Publication date: October 1, 2020Applicant: JFE STEEL CORPORATIONInventors: Yoshiaki ZAIZEN, Yoshihiko ODA, Tatsuhiko HIRATANI
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Patent number: 10760143Abstract: A high-silicon steel sheet is excellent in terms of punching workability and magnetic property. The high-silicon steel sheet has a chemical composition containing, by mass %, C: 0.02% or less, P: 0.02% or less, Si: 4.5% or more and 7.0% or less, Mn: 0.01% or more and 1.0% or less, Al: 1.0% or less, O: 0.01% or less, N: 0.01% or less, and the balance being Fe and inevitable impurities, a grain-boundary oxygen concentration (oxygen concentration with respect to chemical elements segregated at grain boundaries) of 30 at % or less, and a microstructure in which a degree of integration P(211) of a {211}-plane of ?-Fe on a surface of the steel sheet is 15% or more P(211)=p(211)/S×100(%), wherein S=p(110)/100+p(200)/14.93+p(211)/25.88+p(310)/7.68+p(222)/1.59+p(321)/6.27+p(411)/1.55, and p(hkl): integrated intensity of a peak of X-ray diffraction of an {hkl}-plane.Type: GrantFiled: September 8, 2016Date of Patent: September 1, 2020Assignee: JFE Steel CorporationInventors: Tomoyuki Okubo, Tatsuhiko Hiratani, Yoshihiko Oda, Hiroaki Nakajima
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Non-oriented electrical steel sheet and method for manufacturing non-oriented electrical steel sheet
Patent number: 10704115Abstract: Disclosed is a non-oriented electrical steel sheet that is low in iron loss and exhibits excellent magnetic properties even when subjected to final annealing at high temperature. The non-oriented electrical steel sheet can be obtained from a steel (low-Al steel) having a chemical composition containing, in mass %, C: 0.005% or less, Si: 1.0% to 4.5%, Mn: 0.02% to 2.0%, Sol. Al: 0.001% or less, P: 0.2% or less, S+Se: 0.0010% or less, N: 0.005% or less, O: 0.005% or less, and Cu: 0.02% to 0.30%, and the balance consisting of Fe and incidental impurities.Type: GrantFiled: October 21, 2015Date of Patent: July 7, 2020Assignee: JFE STEEL CORPORATIONInventors: Tomoyuki Okubo, Yoshihiko Oda, Tadashi Nakanishi -
Publication number: 20200190639Abstract: Disclosed is a non-oriented electrical steel sheet low in iron loss that is substantially free of Al and contains large amounts of Si and Mn. The disclosed non-oriented electrical steel sheet has a chemical composition containing C: 0.0050% or less, Si: 2.0% to 6.0%, Mn: 1.0% to 3.0%, P: 0.20% or less, S: 0.0050% or less, N: 0.0050% or less, and Al: 0.0050 % or less, with the balance being Fe and inevitable impurities, in which Si—Mn nitrides having an average diameter of 50 nm to 500 nm has a number density of 1/?m3 or less.Type: ApplicationFiled: November 15, 2017Publication date: June 18, 2020Applicant: JFE STEEL CORPORATIONInventors: Hiroaki NAKAJIMA, Masanori UESAKA, Yoshiaki ZAIZEN, Tomoyuki OKUBO, Yoshihiko ODA
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Patent number: 10597759Abstract: A non-oriented electrical steel sheet having a chemical composition comprising C: not more than 0.010 mass %, Si: 1.0-7.0 mass %, Mn: 0.001-3.0 mass %, sol. Al: 0.0001-3.5 mass %, P: 0.01-0.2 mass %, S: not more than 0.010 mass %, N: not more than 0.010 mass % and the remainder being Fe and inevitable impurities, wherein a ratio (P120/Fe700) of a peak-peak height P120 of P near to an electronic energy of 120 eV to a peak-peak height Fe700 of Fe near to an electronic energy of 700 eV in an Auger differential spectrum obtained by analyzing a broken surface of a grain boundary through Auger electron spectroscopy is not less than 0.1 and a sheet thickness is 0.10-0.50 mm, and a motor using such a non-oriented electrical steel sheet as an iron core.Type: GrantFiled: August 11, 2014Date of Patent: March 24, 2020Assignee: JFE STEEL CORPORATIONInventors: Tadashi Nakanishi, Shinji Koseki, Yoshihiko Oda, Hiroaki Toda
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Publication number: 20200010918Abstract: A method of producing a non-oriented electrical steel sheet by hot rolling and cold rolling a steel slab comprising by mass % C: not more than 0.0050%, Si: 2-7%, Mn: 0.05-2.0%, P: not more than 0.2%, S: not more than 0.005%, Al: not more than 3%, N: not more than 0.005%, Ti: not more than 0.003%, Nb: not more than 0.005% and V: not more than 0.005% and then subjecting to a finish annealing and a stress-relief annealing, conditions of the finish annealing and stress-relief annealing are adjusted so that a yield stress of the steel sheet after the finish annealing is not less than 400 MPa and a ratio of a magnetic flux density B50S of the steel sheet after the stress-relief annealing to a magnetic flux density B50H after the finish annealing is not less than 0.99.Type: ApplicationFiled: January 19, 2018Publication date: January 9, 2020Applicant: JFE Steel CorporationInventors: Yoshiaki Zaizen, Yoshihiko Oda, Tomoyuki Okubo
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Patent number: 10526673Abstract: A non-oriented electrical steel sheet is obtained by subjecting a slab containing C: not more than 0.005 mass %, Si: 1.0-5.0 mass %, Mn: 0.04-3.0 mass %, sol. Al: not more than 0.005 mass %, P: 0.03-0.2 mass %, S: not more than 0.005 mass %, N: not more than 0.005 mass %, B: not more than 0.001 mass %, and Se: not more than 0.001 mass % and satisfying sol. Al+C+5B+5Se?0.005 mass % to hot rolling, cold rolling and finish annealing. A sheet temperature at the outlet side of the rolling machine in at least one pass of the final cold rolling is set to a range of 100-300° C. to provide S/2M of not less than 1.0 and S/5C of not less than 1.0 when X-ray intensity ratios of {001}<250>, {111}<112> and {001}<100> in a central layer in a thickness direction are S, M and C, respectively.Type: GrantFiled: June 1, 2015Date of Patent: January 7, 2020Assignee: JFE STEEL CORPORATIONInventors: Tomoyuki Okubo, Tadashi Nakanishi, Yoshihiko Oda, Shinji Koseki
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Publication number: 20190382867Abstract: There are provided a method for producing a non-oriented electrical steel sheet, a method for manufacturing a motor core from such a steel sheet, and a motor core. In the production of a non-oriented electrical steel sheet by subjecting a steel slab containing given amounts of C, Si, Mn, P, S, Al, N, Ti, Nb and V, provided that Si, Al and Mn satisfy Si-2Al-Mn?0, to hot rolling, cold rolling, finish annealing and stress relief annealing, conditions of the finish annealing and stress relief annealing are adjusted such that a yield stress after the finish annealing is not less than 400 MPa and iron loss W10/400 (W/kg) after the stress relief annealing in relation to a sheet thickness t (mm) satisfies W10/400?10+25t and magnetostriction ?o-p (bake) after the stress relief annealing is not more than 5.0×10?6 and a ratio (?o-p (bake)/?o-p (green)) of magnetostriction ?o-p (bake) after the stress relief annealing to magnetostriction ?o-p (green) before the stress relief annealing is less than 0.Type: ApplicationFiled: February 7, 2018Publication date: December 19, 2019Applicant: JFE STEEL CORPORATIONInventors: Yoshiaki ZAIZEN, Yoshihiko ODA, Tomoyuki OKUBO
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Publication number: 20190330708Abstract: A non-oriented electrical steel sheet has a chemical composition including C: not more than 0.0050 mass %, Si: 1.0-5.0 mass %, Mn: 0.03-3.0 mass %, P: not more than 0.2 mass %, S: not more than 0.005 mass %, Al: not more than 0.05 mass %, N: not more than 0.0050 mass %, 0: not more than 0.010 mass %, Ti: not more than 0.0030 mass %, Nb: not more than 0.0030 mass %, B: 0.0005-0.0050 mass % and the remainder being Fe and inevitable impurities, and is excellent in not only the recyclability, but also iron loss property after stress-relief annealing.Type: ApplicationFiled: December 12, 2017Publication date: October 31, 2019Inventors: Tomoyuki Okubo, Masanori Uesaka, Yoshihiko Oda
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Publication number: 20190330710Abstract: According to the disclosure, it is possible to increase the magnetic flux density and reduce iron loss by setting a chemical composition containing, by mass %, C: 0.0050% or less, Si: 1.50% or more and 4.00% or less, Al: 0.500% or less, Mn: 0.10% or more and 5.00% or less, S: 0.0200% or less, P: 0.200% or less, N: 0.0050% or less, O: 0.0200% or less, and at least one of Sb: 0.0010% or more and 0.10% or less, and Sn: 0.0010% or more and 0.10% or less, with the balance being Fe and inevitable impurities, an Ar3 transformation temperature of 700° C. or higher, a grain size of 80 ?m or more and 200 ?m or less, and a Vickers hardness of 140 HV or more and 230 HV or less.Type: ApplicationFiled: January 12, 2018Publication date: October 31, 2019Applicant: JFE STEEL CORPORATIONInventors: Yoshihiko ODA, Tomoyuki OKUBO, Yoshiaki ZAIZEN, Masanori UESAKA
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Publication number: 20190312495Abstract: A punch processing method for electrical steel sheets to manufacture core segments includes: stacking a plurality of electrical steel sheets; and punching out the plurality of electrical steel sheets in a stacked state simultaneously to manufacture the core segments, wherein in a case where the core segments are applied to a stator core in which a maximum magnetic flux density at a tooth portion is to be higher than a maximum magnetic flux density at a back yoke portion, degrees of Vickers hardness of an electrical steel sheet located second from a bottom side and above in the stacked state are set to 180 HV or higher, and 10 HV or higher than a value of degree of Vickers hardness of an electrical steel sheet located on the bottom side in the stacked state.Type: ApplicationFiled: August 22, 2017Publication date: October 10, 2019Applicant: JFE STEEL CORPORATIONInventors: Kunihiro SENDA, Masanori UESAKA, Yoshihiko ODA
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Publication number: 20190244735Abstract: Iron loss is reduced by increasing magnetic flux density. Disclosed is a non-oriented electrical steel sheet has a chemical composition containing, by mass %, C: 0.0050% or less, Si: 1.50% or more and 4.00% or less, Al: 0.500% or less, Mn: 0.10% or more and 5.00% or less, S: 0.0200% or less, P: 0.200% or less, N: 0.0050% or less, O: 0.0200% or less, and Ca: 0.0010% or more and 0.0050% or less, with the balance being Fe and inevitable impurities, in which the non-oriented electrical steel sheet has an Ar3 transformation temperature of 700° C. or higher, a grain size of 80 ?m or more and 200 ?m or less, and a Vickers hardness of 140 HV or more and 230 HV or less.Type: ApplicationFiled: August 30, 2017Publication date: August 8, 2019Applicant: JFE STEEL CORPORATIONInventors: Yoshihiko ODA, Tomoyuki OKUBO, Yoshiaki ZAIZEN, Masanori UESAKA, Tatsuhiko HIRATANI
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Patent number: 10316382Abstract: In the production of a non-oriented electrical stress sheet by hot rolling a steel slab containing, by mass %, C: not more than 0.005%, Si: not more than 8.0%, Mn: 0.03-3.0%, P: not more than 0.2%, S: not more than 0.005%, Al: not more than 3.0%, N: not more than 0.005%, Ni: not more than 3%, Cr: not more than 5%, Ti: not more than 0.005%, Nb: not more than 0.003%, As: not more than 0.005% and O: not more than 0.005%, subjecting to one cold rolling or two or more cold rollings interposing an intermediate annealing therebetween after conducting a hot band annealing or without conducting a hot band annealing and subjecting to a finish annealing, an average heating rate from 600° C. to 700° C. during the heating process in the finish annealing is set to not less than 50° C./sec.Type: GrantFiled: December 11, 2015Date of Patent: June 11, 2019Assignee: JFE STEEL CORPORATIONInventors: Tomoyuki Okubo, Kohei Kurihara, Yoshihiko Oda, Hiroaki Nakajima