Patents by Inventor Takeshi Toyoda

Takeshi Toyoda 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: 20230399729
    Abstract: As a burring processed member able to suppress the formation of fatigue cracks in a burring part, one having a structure satisfying the following relations (1) to (3) is disclosed: 3?Ra?100 . . . (1), 3.0<h . . . (2), 24+r?[TS/(40+0.28×Ra)]<h . . . (3), where, “Ra” is an arithmetic mean roughness (?m) of the burring end face, “h” is a height (mm) from the first surface to the burring end face, “r” is a radius of curvature (mm) of the curved wall part, and “TS” is the tensile strength (MPa) of the sheet-shaped part.
    Type: Application
    Filed: October 13, 2021
    Publication date: December 14, 2023
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Kohei NAKADA, Ryo TABATA, Takeshi KAWACHI, Takeshi TOYODA
  • Publication number: 20230287530
    Abstract: A high-strength hot-rolled steel sheet: having a predetermined chemical composition; having a mean dislocation density of from 1 × 1014 to 1 × 1016 m-2, and containing at least bainitic ferrite, in which a total area ratio of the bainitic ferrite and ferrite is 70% or more and less than 90%, and in which a total area ratio of martensite and retained austenite is 5% or more and 30% or less, in which, in ferrite crystal grains and in bainitic ferrite crystal grains, a mean number density of TiC precipitates is from 1 × 1017 to 5 × 1018 [precipitates/cm3], in which an amount of Ti present as a TiC precipitate precipitated in a matrix not on dislocations is 30 mass% or more of a total amount of Ti in the steel sheet, and in which a tensile strength is 850 MPa or more.
    Type: Application
    Filed: April 15, 2021
    Publication date: September 14, 2023
    Inventors: Yukiko KOBAYASHI, Jun TAKAHASHI, Tatsuo YOKOI, Riki OKAMOTO, Takeshi TOYODA
  • Publication number: 20230286390
    Abstract: A vehicle travel control device calculates torques required for a motor in a first regenerative control mode and a second regenerative control mode based on an accelerator opening degree and a vehicle speed, selects torque required for the motor suitable for the first regenerative control mode or the second regenerative control mode from among the calculated torques required for the motor, and limits a change rate of the torque required for the motor when the selected torque required for the motor changes beyond a predetermined change rate by switching from the first regenerative control mode to the second regenerative control mode.
    Type: Application
    Filed: July 14, 2021
    Publication date: September 14, 2023
    Applicant: MITSUBISHI JIDOSHA KOGYO KABUSHIKI KAISHA
    Inventors: Takeshi TOYODA, Toshifumi MIZUI
  • Publication number: 20230265548
    Abstract: Provided is a hot rolled steel sheet having a tensile strength of 780 MPa or more, a sheet thickness of 1.2 to 4.0 mm, and a sheet width of 750 mm or more, and satisfying -15?(?W 1 +?W2)/2-?C ?15 (where ?W1 and ?W2 respectively indicate hole expansion ratios (%) at ? positions of the sheet width from one end of the hot rolled steel sheet in a sheet width direction perpendicular to a rolling direction and the other end at an opposite side, and ?C indicates a hole expansion ratio (%) of a sheet width center part).
    Type: Application
    Filed: August 10, 2021
    Publication date: August 24, 2023
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Takeshi TOYODA, Eisaku SAKURADA
  • Publication number: 20230064386
    Abstract: A battery operation mode display device includes the mode display unit that displays a plurality of battery operation modes for controlling discharging and charging. The mode display unit sequentially displays a first mode indicator corresponding to a first battery operation mode identified in a first engine drive permission range, a second mode indicator corresponding to a second battery operation mode identified in a second engine drive permission range wider than the first engine drive permission range, and a third mode indicator corresponding to a third battery operation mode identified in a third engine drive permission range wider than the second engine drive permission range, among a plurality of battery operation modes identified for each drive permission range of the engine, in accordance with the drive permission range of the engine.
    Type: Application
    Filed: January 15, 2021
    Publication date: March 2, 2023
    Applicant: MITSUBISHI JIDOSHA KOGYO KABUSHIKI KAISHA
    Inventors: Toshifumi MIZUI, Takeshi TOYODA, Yuichi KAMEI, Hiroshi TACHIBANA
  • Publication number: 20230058534
    Abstract: A battery control device includes: an input unit that selects and inputs a first battery operation mode that is one of a plurality of battery operation modes that control discharging from a battery to an electric motor and charging from a generator to the battery by an operation of an occupant of the vehicle; a selection status display unit that displays a mode indicator corresponding to each of the plurality of battery operation modes and displays a selection status in the input unit; a confirmation unit that confirms the first battery operation mode when a selected state of the first battery operation mode is maintained for a predetermined time after the first battery operation mode is selected in the input unit; and a battery operation control unit that controls the operation of the battery of the vehicle based on the first battery operation mode confirmed by the confirmation unit.
    Type: Application
    Filed: January 15, 2021
    Publication date: February 23, 2023
    Applicant: MITSUBISHI JIDOSHA KOGYO KABUSHIKI KAISHA
    Inventors: Toshifumi MIZUI, Takeshi TOYODA, Yuichi KAMEI, Hiroshi TACHIBANA
  • Publication number: 20230029319
    Abstract: Provided is a hot rolled steel sheet having a predetermined chemical composition and a microstructure comprising, by area ratio, pearlite: 90 to 100% and pro-eutectoid ferrite: 0 to 10%, wherein the pearlite has an average lamellar spacing of 0.08 to 0.30 ?m, and the percentage of cementite in the pearlite having a major axis length of more than 0.3 ?m and an aspect ratio of less than 3.0 is less than 15%.
    Type: Application
    Filed: February 12, 2021
    Publication date: January 26, 2023
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Kohei NAKADA, Takeshi TOYODA
  • Publication number: 20220380876
    Abstract: This hot-rolled steel sheet has a predetermined chemical composition, in a microstructure at a 1/4 position of a sheet thickness in a sheet thickness direction from a surface, by area ratios, a primary phase is 95.00% to 98.00% of bainite, a secondary phase is 2.00% to 5.00% of tempered martensite, an average grain size of the secondary phase is 1.5 ?m or less, a pole density in a (110)<112> orientation is 3.0 or less, an average grain size of an iron-based carbide is 0.100 ?m or less, in a microstructure from the surface to a 1/16 position of the sheet thickness in the sheet thickness direction from the surface, a pole density in a (110)<1-11> orientation is 3.0 or less, and a tensile, strength TS is 980 MPa or more.
    Type: Application
    Filed: December 8, 2020
    Publication date: December 1, 2022
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Daisuke ITO, Shohei YABU, Takeshi TOYODA
  • Patent number: 11512359
    Abstract: Provided is a hot rolled steel sheet comprising a predetermined composition wherein the hot rolled steel sheet comprises ferrite with an average orientation difference in the same grain of 0.5 to 5.0° in 30 to 70 vol %, the ferrite and martensite in a total of 90 vol % or more, and a balance microstructure of 10 vol % or less, has an average grain size of the ferrite of 0.5 to 5.0 ?m, and has an average grain size of the martensite and the balance microstructure of 1.0 to 10 ?m. Provided is a method for producing a hot rolled steel sheet comprising rolling where two or more consecutive passes of rolling including a final pass are performed under conditions of a rolling temperature: A point or more and less than Ae3 point, a strain rate: 1.0 to 50/sec, and a time between passes: within 10 seconds and where a total strain amount of all passes satisfying the conditions is 1.4 to 4.0, cooling by a 20° C.
    Type: Grant
    Filed: November 22, 2018
    Date of Patent: November 29, 2022
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Tetsuya Hirashima, Takeshi Toyoda
  • Publication number: 20220372588
    Abstract: This hot-rolled steel sheet has a predetermined chemical composition, in a microstructure at a ¼ position of a sheet thickness in a sheet thickness direction from a surface, a primary phase is bainite, a secondary phase is martensite or a martensite-austenite mixed phase, an average grain size of the secondary phase is 1.5 ?m or less, an average grain size of particles having grain diameters that are largest 10% or less out of all particles in the secondary phase is 2.5 ?m or less, a pole density in a (110)<112> orientation is 3.0 or less, and, in a microstructure from the surface to a 1/16 position of the sheet thickness in the sheet thickness direction from the surface, a pole density in a (110)<1-11> orientation is 3.0 or less.
    Type: Application
    Filed: December 8, 2020
    Publication date: November 24, 2022
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Daisuke ITO, Shohei YABU, Takeshi TOYODA
  • Patent number: 11502235
    Abstract: A thermoelectric material includes a parent phase in which an MgSiSn alloy is a main component, a void formed in the parent phase, and a silicon layer that is formed on at least a wall surface of the void and that includes silicon as a main component. The thermoelectric material further includes MgO in an amount of 1.0 wt. % or more and 20.0 wt. % or less. The silicon layer includes amorphous Si, or amorphous Si and nanosized Si crystals, and the parent phase includes a region in which the composition ratio of the Si of the chemical composition of the MgSiSn alloy is higher than in the other regions and a region in which the composition ratio of the Sn of the chemical composition of the MgSiSn alloy is higher than in the other regions. With these configurations, the thermoelectric material realizes both lower thermal conductivity and lower electrical resistivity.
    Type: Grant
    Filed: August 10, 2018
    Date of Patent: November 15, 2022
    Assignees: HAKUSAN, INC., JAPAN ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGY, ISHIKAWA PREFECTURE
    Inventors: Shigeyuki Tsurumi, Kazumasa Yasuda, Takeshi Sotome, Mikio Koyano, Takeshi Toyoda, Akinari Matoba, Toshiharu Minamikawa
  • Patent number: 11486020
    Abstract: In a hot-rolled steel sheet having a predetermined chemical composition and having a metallographic structure including 90 vol % or greater of martensite and 0 vol % to 10 vol % of a residual structure, the residual structure includes one or both of bainite and ferrite, the average prior austenite grain size in an L-section parallel to a rolling direction and an average prior austenite grain size in a C-section parallel to a direction orthogonal to the rolling direction are 1.0 ?m to 10.0 ?m the aspect ratio associated with the prior austenite grain size is 1.8 or less, the average grain size of the residual structure in the L-section and the average grain size of the residual structure in the C-section are 5.0 ?m or less, and the aspect ratio associated with the average grain size of the residual structure is 2.0 or less.
    Type: Grant
    Filed: April 26, 2019
    Date of Patent: November 1, 2022
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Tetsuya Hirashima, Takeshi Toyoda
  • Patent number: 11473159
    Abstract: Provided is a hot rolled steel sheet comprising a predetermined composition wherein the hot rolled steel sheet comprises first ferrite with an average orientation difference in the same grain of 0.5 to 5.0° in 30 to 70 vol %, at least one type of structures among bainite and second ferrite with an average orientation difference of 0 to less than 0.5° and the first ferrite in a total of 95 vol % or more, a balance microstructure of 5 vol % or less, has an average grain size of the first ferrite of 0.5 to 5.0 ?m, and has an average grain size of the other structures of 1.0 to 10 ?m. Provided is a method for producing a hot rolled steel sheet comprising rolling where two or more consecutive passes of rolling including a final pass are performed under conditions of a rolling temperature: A point or more and less than Ae3 point etc., and where a total strain amount of all passes satisfying the conditions is 1.4 to 4.0, cooling by a 20 to 50° C./sec average cooling rate, and coiling the steel sheet at 300° C.
    Type: Grant
    Filed: November 22, 2018
    Date of Patent: October 18, 2022
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Tetsuya Hirashima, Takeshi Toyoda
  • Patent number: 11434555
    Abstract: The hot-rolled steel sheet includes, in % by mass, 0.10% or more and 0.50% or less of C; 0.10% or more and 3.0% or less of Si; 0.5% or more and 3.0% or less of Mn; 0.10% or less of P; 0.010% or less of S; 1.00% or less of Al; 0.010% or less of N; 0% or more and 0.20% or less of Ti; 0% or more and 0.100% or less of Nb; 0% or more and 0.0060% or less of Ca; 0% or more and 0.50% or less of Mo; and 0% or more and 1.00% or less of Cr; with the balance comprising Fe and impurities, and an average grain size of prior austenite in a structure is 0.1 ?m or larger and 3.0 ?m or smaller, and a sheet crown quantity corresponding to a thickness difference between a width center portion and a portion away, by 10 mm, from a width edge portion in the widthwise direction toward the width center portion is 80 ?m or smaller.
    Type: Grant
    Filed: April 17, 2019
    Date of Patent: September 6, 2022
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Takeshi Toyoda, Tetsuya Hirashima, Riki Okamoto
  • Publication number: 20220186333
    Abstract: A high-strength steel sheet includes a predetermined chemical composition, a microstructure contains, by volume percentage, 95% or more of tempered martensite and bainite in total, and a remainder consists of ferrite and pearlite, the microstructure contains 5.0×109 pieces/mm or more of, per unit volume, precipitate having an equivalent circle diameter of 5.0 nm or less and containing Ti, Hvs/Hvc which is a ratio of an average hardness Hvs at a position of a depth of 20 ?m from a surface to an average hardness Hvc at a position of 0.20 to 0.50 mm from the surface is 0.85 or more, a tensile strength is 980 MPa or more, and a product of the tensile strength and elongation is 12,000 MPa×% or more.
    Type: Application
    Filed: March 19, 2020
    Publication date: June 16, 2022
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Masafumi AZUMA, Eisaku SAKURADA, Genki ABUKAWA, Kenichiro OTSUKA, Takeshi TOYODA
  • Patent number: 11326235
    Abstract: A hot rolled steel sheet according to an aspect of the present invention has a predetermined chemical composition, and a metallographic structure in which martensite is the major structure, wherein an average length of grains in an L direction parallel to a rolling direction is 0.2 ?m or more and 5.0 ?m or less, an average length of grains in a C direction parallel to a transverse direction is 0.1 ?m or more and 5.0 ?m or less, the ratio of the average length in the C direction to the average length in the L direction is 0.2 or more and 5.0 or less, and the tensile strength is 1180 MPa or more.
    Type: Grant
    Filed: August 9, 2018
    Date of Patent: May 10, 2022
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Tetsuya Hirashima, Takeshi Toyoda
  • Publication number: 20220112574
    Abstract: A high-strength steel sheet includes a predetermined chemical composition, a microstructure contains, by volume percentage, 80% or more of tempered martensite, and a remainder consists of ferrite and bainite, the microstructure contains 5.0×1011 pieces/mm3 or more of, per unit volume, precipitate containing Ti and having an equivalent circle diameter of 5.0 nm or less, Hvs/Hvc which is a ratio of an average hardness Hvs at a position of a depth of 20 ?m from a surface to an average hardness Hvc at a position of 0.20 to 0.50 mm from the surface is 0.85 or more, and the tensile strength is 1,180 MPa or more.
    Type: Application
    Filed: March 19, 2020
    Publication date: April 14, 2022
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Masafumi AZUMA, Eisaku SAKURADA, Genki ABUKAWA, Kenichiro OTSUKA, Takeshi TOYODA
  • Publication number: 20220106655
    Abstract: To provide a hot-rolled steel sheet comprising by mass %: C: 0.12% or more and 0.25% or less, Si: 0.01% or more and 2.0% or less, Mn: 0.5% or more and 3.0% or less, Al: 0.001% or more and 0.10% or less, and B: 0.0005% or more and 0.0050% or less, and comprising one or both of: Nb: 0.001% or more and 0.020% or less, and Ti: 0.001% or more and 0.20% or less, wherein a metal structure at a position of ¼ thickness from a surface contains more than 90%, in area ratio, of tempered martensite, carbides in the tempered martensite have an average grain size of 10 nm or less, prior austenite grains have an average grain size of less than 40 ?m, the prior austenite grains have an aspect ratio of 3.5 or less, and an X-ray random intensity ratio of {112}<110> orientation at a position of ½ thickness from a surface is 4.0 or less, and a method for manufacturing the same.
    Type: Application
    Filed: January 20, 2020
    Publication date: April 7, 2022
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Daisuke ITO, Takeshi TOYODA
  • Publication number: 20220090224
    Abstract: Hot-rolled steel sheet having a chemical composition including, in mass %, C: 0.02 to 0.20%, Si: 0.01 to 1.50%, Mn: 0.10 to 3.00%, P: 0.10% or less, S: 0.010% or less, Al: 0.005 to 0.100%, Ti: 0.02 to 0.20%, N: 0.001 to 0.010%, Cu: 0 to 0.50%, Ni: 0 to 0.50%, Cr: 0 to 1.00%, Mo: 0 to 0.40%, Nb: 0 to 0.060%, V: 0 to 1.00%, B: 0 to 0.0100%, Ca: 0 to 0.0050%, O: 0.0100% or less, and the balance: Fe and impurities; in which: a steel micro-structure includes, in area %, ferrite: 60 to 80%, and a total of ferrite and bainite: 90% or more; an average of the crystal grain size of ferrite and bainite is 7.0 ?m or less, a standard deviation of the crystal grain size is 2.0 or less; and a standard deviation of a diameter of Ti carbo-nitrides is 10 nm or less.
    Type: Application
    Filed: December 24, 2019
    Publication date: March 24, 2022
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Takeshi TOYODA, Hitoshi NIKAIDO, Kohei NAKADA, Yui YAMASHITA, Kazuki MATSUDA
  • Patent number: 11274355
    Abstract: A hot rolled steel sheet is provided, which is excellent in collision characteristics, excellent in anisotropy of toughness, and high in strength. The hot rolled steel sheet is characterized by containing, by mass %, C: 0.10% to 0.50%, Si: 0.10% to 3.00%, Mn: 0.5% to 3.0%, P: 0.100% or less, S: 0.010% or less, Al: 1.00% or less, N: 0.010% or less and a balance of Fe and impurities, wherein a metal structure at position of ¼ thickness from surface in L-cross-section of the steel sheet comprises prior austenite grains of average value of aspect ratios of 2.0 or less, average grain size of 0.1 ?m to 3.0 ?m, and coefficient of variation of a standard deviation of grain size distribution/average grain size of 0.40 or more, and a texture with X-ray diffraction intensity ratio of {001}<110>orientation for random samples of 2.0 or more, and the steel sheet has tensile strength of 1180 MPa or more.
    Type: Grant
    Filed: February 16, 2018
    Date of Patent: March 15, 2022
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Takeshi Toyoda, Riki Okamoto, Natsuko Sugiura, Tetsuya Hirashima