Patents by Inventor Toshimitsu Aso

Toshimitsu Aso 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: 20200038931
    Abstract: The manufacturing method includes a first step in which a pad holding state is established and a second step in which pad draw forming is performed after the first step is completed.
    Type: Application
    Filed: October 5, 2017
    Publication date: February 6, 2020
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Takashi MIYAGI, Yasuharu TANAKA, Misao OGAWA, Toshimitsu ASO, Takashi YAMAMOTO
  • Publication number: 20190160510
    Abstract: To produce an L-shaped pressed component without causing occurrence of wrinkles or cracks through first to third steps: the first step where a portion of a blank 8, having tensile strength of 1180 MPa or more, to be formed into a portion disposed outward of a curved portion is held in a state of being clamped by a blank holder 73 and a die 71, and a portion of the blank 8 to be formed into a top plate 11 is held in a state of being clamped by a pad 74 and a punch 72; the second step where a vertical wall 14, a concave ridge 17 and a flange 15 on the inner side of a curved portion 1a are formed by bend forming with a bending die 75, thus forming one, two or more material inflow promoting portion, which increases an inflow amount of the blank 8 flowing into a portion to be formed into the flange 15 on the inner side of the curved portion 1a, in the vicinity of a portion of the blank 8 to be formed into the flange 15 on the inner side of the curved portion 1a of the pressed component 1; and the third step where
    Type: Application
    Filed: June 26, 2017
    Publication date: May 30, 2019
    Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Yasuharu TANAKA, Toshimitsu ASO, Takashi MIYAGI, Misao OGAWA, Shinobu YAMAMOTO, Keita IKEGAMI
  • Patent number: 10245634
    Abstract: A hat-shaped cross-section component manufacturing apparatus includes: a die that includes a forming face that grips and presses a metal stock sheet; a blank holder, that includes a forming face that grips and presses the metal stock sheet so as to configure a forming face corresponding to the forming face of the die, a pad that is disposed inside the opening formed in the die, and that includes a forming face that grips and presses the metal stock sheet; and a punch that is disposed facing the pad and that includes a forming face that grips and presses the metal stock sheet so as to configure a forming face corresponding to the forming face of the pad. The hat-shaped cross-section component manufacturing apparatus further includes a pressure limiting device that limits a formed curving component from being pressed between the pad and the blank holder during demolding.
    Type: Grant
    Filed: September 18, 2014
    Date of Patent: April 2, 2019
    Assignee: Nippon Steel & Sumitomo Metal Corporation
    Inventors: Yasuharu Tanaka, Toshimitsu Aso, Takashi Miyagi, Misao Ogawa, Shinobu Yamamoto
  • Patent number: 10179360
    Abstract: A curved part 10 having a hat-shaped cross section is produced by press-forming without causing cracks and wrinkles. When producing a curved part 10, which is made up of a top plate 11, vertical walls 12a and 12b extended in parallel with each other along ridgelines 14a and 14b of the top plate, and outwardly directed flanges 13a and 13b which connect to leading edges of the vertical walls, and has a generally hat-shaped cross section, by press forming, the metal material sheet 601 is interposed and constrained by the die 502 and the blank holder 505 and is press-formed while the metal material sheet 601 being interposed and constrained by the pad 503 and the punch 504.
    Type: Grant
    Filed: September 5, 2013
    Date of Patent: January 15, 2019
    Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Toshimitsu Aso, Yasuharu Tanaka, Takashi Miyagi, Misao Ogawa, Kazuyuki Kawano
  • Publication number: 20180264534
    Abstract: A method for manufacturing a hat-shaped cross-section component includes a gripping process, a bending and stretching process, and a bend back process. In the gripping process, a pair of vertical walls of an elongated preliminarily formed component that has been formed into a hat-shaped cross-section formed into a hat shaped cross section profile are disposed at a width direction outside of a punch, and a top plate of the preliminarily formed component is gripped using the punch and a pad. In the bending and stretching process, after the gripping process, a die provided on both width direction sides of the pad is moved toward the punch side relative to the preliminarily formed component, and the die is used to bend and stretch the vertical walls toward the opposite side to the top plate at one side in the length direction of the preliminarily formed component.
    Type: Application
    Filed: December 18, 2015
    Publication date: September 20, 2018
    Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Toshimitsu ASO, Yasuharu TANAKA, Takashi MIYAGI, Misao OGAWA, Shinobu YAMAMOTO
  • Patent number: 10030280
    Abstract: The present invention provides a steel sheet with chemical components including, by mass %, 0.18-0.35% of C, 1.0%-3.0% of Mn, 0.01%-1.0% of Si, 0.001%-0.02% of P, 0.0005%-0.01% of S, 0.001%-0.01% of N, 0.01%-1.0% of Al, 0.005%-0.2% of Ti, 0.0002%-0.005% of B, and 0.002%-2.0% of Cr, and the balance of Fe and inevitable impurities, wherein: by volume %, a fraction of the ferrite is 50% or more, and a fraction of a non-recrystallized ferrite is 30% or less; and Cr?/CrM is 2 or less, where Cr? is a concentration of Cr subjected to solid solution in iron carbide and CrM is a concentration of Cr subjected to solid solution in a base material, or Mn0/MnM is 10 or less, where Mn0 is a concentration of Mn subjected to solid solution in an iron carbide, and MnM is a concentration of Mn subjected to solid solution in a base material.
    Type: Grant
    Filed: October 21, 2011
    Date of Patent: July 24, 2018
    Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Kunio Hayashi, Toshimitsu Aso, Toshimasa Tomokiyo
  • Patent number: 10022763
    Abstract: A method produces a press-molded article having a hat shaped cross-section with flanges at both sides, a top plate, vertical walls at both sides, and having a shape curved in the vertical direction to an inverted checkmark shape along the longitudinal direction when the molded article is viewed from a side face with the top plate section on the top side. An intermediate molded body is formed by drawing a metal stock sheet into an intermediate shape, and after preparing the outside shape of the intermediate molded body by trimming, drawing is subsequently performed to form the final shape.
    Type: Grant
    Filed: December 22, 2014
    Date of Patent: July 17, 2018
    Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Yasuharu Tanaka, Toshimitsu Aso, Misao Ogawa, Takashi Miyagi, Shinobu Yamamoto
  • Patent number: 10016804
    Abstract: A hat-shaped cross-section component manufacturing apparatus includes: a die that includes a forming face that presses both side portions of a metal stock sheet; a punch that includes a forming face that presses a central portion of the metal stock sheet; a pad that includes a forming face that presses and grips the central portion of the metal stock sheet against the punch; and a blank holder that includes a forming face that presses and grips the both side portions of the metal stock sheet against the die. The hat-shaped cross-section component manufacturing apparatus further includes a pressure limiting device configured including a floating block that moves together with the blank holder when forming of a curving component has been completed, that is interposed between the pad and the blank holder, and that limits pressing of the formed curving component between the pad and the blank holder during demolding.
    Type: Grant
    Filed: October 16, 2014
    Date of Patent: July 10, 2018
    Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Yasuharu Tanaka, Toshimitsu Aso, Takashi Miyagi, Misao Ogawa, Shinobu Yamamoto, Eizo Hayashida
  • Publication number: 20180133778
    Abstract: This press-formed article includes: a top sheet portion; a sidewall continuing to the top sheet portion via a convex ridge line portion; a flange continuing to the sidewall via a concaved ridge line portion; and an outward flange continuing from an edge portion of the top sheet portion to an edge portion of the flange, via an edge portion of the convex ridge line portion, an edge portion of the sidewall, and an edge portion of the concaved ridge line portion, wherein in the same unit, an average thickness TAve, a minimum thickness TMin, and a maximum thickness TMax of the outward flange satisfy Equation 1 and Equation 2. 0.8×TAve?TMin<TAve??(Equation 1) TAve<TMax?1.
    Type: Application
    Filed: June 1, 2016
    Publication date: May 17, 2018
    Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Yasuharu TANAKA, Misao OGAWA, Takashi MIYAGI, Toshimitsu ASO, Hiroyuki TANOUE, Ryo KURODA
  • Patent number: 9896736
    Abstract: The present invention provides a method for manufacturing a hot stamped body having a vertical wall, the method including: a hot-rolling step; a coiling step; a cold-rolling step; a continuous annealing step; and a hot stamping step, in which the continuous annealing step includes a heating step of heating the cold-rolled steel sheet to a temperature range of equal to or higher than Ac1° C. and lower than Ac3° C.; a cooling step of cooling the heated cold-rolled steel sheet from the highest heating temperature to 660° C. at a cooling rate of equal to or less than 10° C./s; and a holding step of holding the cooled cold-rolled steel sheet in a temperature range of 550° C. to 660° C. for one minute to 10 minutes.
    Type: Grant
    Filed: October 28, 2016
    Date of Patent: February 20, 2018
    Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Toshimasa Tomokiyo, Kunio Hayashi, Toshimitsu Aso
  • Patent number: 9839954
    Abstract: A center pillar reinforcement is produced satisfactorily by using a high-tensile material having a low ductility as a blank. The center pillar reinforcement is produced by performing a first step for producing a first intermediate formed product on which a body is partially formed by press-forming the blank using a first press-forming device for drawing, and a second step for pressing the first intermediate formed product by using a second press-forming device for bend-forming.
    Type: Grant
    Filed: September 26, 2013
    Date of Patent: December 12, 2017
    Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Takashi Miyagi, Yasuharu Tanaka, Misao Ogawa, Toshimitsu Aso, Kei Misawa, Hiroshi Yoshida, Kazuhiko Honda
  • Patent number: 9840751
    Abstract: Provided is a method for manufacturing a hot stamped body, the method including: a hot-rolling step; a coiling step; a cold-rolling step; a continuous annealing step; and a hot stamping step, in which the continuous annealing step includes a heating step of heating the cold-rolled steel sheet to a temperature range of equal to or higher than Ac1° C. and lower than Ac3° C.; a cooling step of cooling the heated cold-rolled steel sheet from the highest heating temperature to 660° C. at a cooling rate of equal to or less than 10° C./s; and a holding step of holding the cooled cold-rolled steel sheet in a temperature range of 550° C. to 660° C. for one minute to 10 minutes.
    Type: Grant
    Filed: February 2, 2017
    Date of Patent: December 12, 2017
    Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Kunio Hayashi, Toshimitsu Aso, Toshimasa Tomokiyo, Hitoshi Tanino, Ryozo Wada
  • Patent number: 9731339
    Abstract: A method produces a press-molded article having a hat shaped cross-section with flanges at both sides, a top plate, vertical walls at both sides, and having a shape curved in the vertical direction to an inverted checkmark shape along the longitudinal direction when the molded article is viewed from a side face with the top plate section on the top side. An intermediate molded body is formed by drawing a metal stock sheet into an intermediate shape, and after preparing the outside shape of the intermediate molded body by trimming, drawing is subsequently performed to form the final shape.
    Type: Grant
    Filed: December 20, 2013
    Date of Patent: August 15, 2017
    Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Takashi Miyagi, Yasuharu Tanaka, Misao Ogawa, Toshimitsu Aso
  • Patent number: 9718499
    Abstract: The top plate section of the metal stock is pressed and clamped against a punch by a pad, a portion that will be at the outside of the L shaped curve is pressed and camped against a die by a blank holder, a bender is moved, and a vertical wall portion at the inside of the L shaped curved of the metal stock sheet and the flange portion joined to the vertical wall at the inside of the L shaped curve are molded. The metal stock sheet is moved in the direction toward the blank holder while the metal stock sheet being pressed and clamped, and a vertical wall portion at the outside of the L shaped curve of the L shaped hat shaped cross-section and the flange portion joined to the vertical wall at the outside of the L shaped curve are molded.
    Type: Grant
    Filed: December 20, 2013
    Date of Patent: August 1, 2017
    Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Yasuharu Tanaka, Toshimitsu Aso, Takashi Miyagi, Misao Ogawa, Kazuyuki Kawano, Kazunori Oooka, Shinobu Yamamoto
  • Publication number: 20170151597
    Abstract: A blank for forming a pressed article, the blank including a flat pattern edge configuring an edge on one length direction side of the blank, and an excess portion formed at the flat pattern edge. An edge of the excess portion includes a first convex portion that protrudes toward the one length direction side of the blank with respect to the flat pattern edge, a first concave portion that is adjacent to the first convex portion at a width direction outer side of the blank, that is formed in a concave shape, and that connects the flat pattern edge and the first convex portion together, and a second concave portion that is adjacent to the first convex portion at a width direction inner side of the blank, that is formed in a concave shape, and that connects the flat pattern edge and the first convex portion together.
    Type: Application
    Filed: May 8, 2015
    Publication date: June 1, 2017
    Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Takashi MIYAGI, Yasuharu TANAKA, Misao OGAWA, Toshimitsu ASO
  • Publication number: 20170151599
    Abstract: A pressed article manufacturing method employing a press mold equipped with a punch and a die to manufacture a pressed article including a first wall, a second wall extending out from an end portion on at least one length direction side of the first wall toward a back face side of the first wall, and a third wall extending out from a leading end portion of the second wall toward a front face side of the second wall. The manufacturing method includes using the punch and the die to apply pressure to and grip a portion on a base end side of the second wall in a first warp shape in which the base end side portion is warped so as to be convex on a back face side of the second wall as viewed in lateral cross-section in a state prior to demolding from the press mold.
    Type: Application
    Filed: June 26, 2015
    Publication date: June 1, 2017
    Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Takashi MIYAGI, Misao OGAWA, Toshimitsu ASO, Yasuharu TANAKA, Keiichi MURAKAMI
  • Publication number: 20170145531
    Abstract: Provided is a method for manufacturing a hot stamped body, the method including: a hot-rolling step; a coiling step; a cold-rolling step; a continuous annealing step; and a hot stamping step, in which the continuous annealing step includes a heating step of heating the cold-rolled steel sheet to a temperature range of equal to or higher than Ac1° C. and lower than Ac3° C.; a cooling step of cooling the heated cold-rolled steel sheet from the highest heating temperature to 660° C. at a cooling rate of equal to or less than 10° C./s; and a holding step of holding the cooled cold-rolled steel sheet in a temperature range of 550° C. to 660° C. for one minute to 10 minutes.
    Type: Application
    Filed: February 2, 2017
    Publication date: May 25, 2017
    Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Kunio HAYASHI, Toshimitsu ASO, Toshimasa TOMOKIYO, Hitoshi TANINO, Ryozo WADA
  • Patent number: 9598745
    Abstract: The present invention provides a method for manufacturing a hot stamped body, the method including: a hot-rolling step; a coiling step; a cold-rolling step; a continuous annealing step; and a hot stamping step, in which the continuous annealing step includes a heating step of heating the cold-rolled steel sheet to a temperature range of equal to or higher than Ac1° C. and lower than Ac3° C.; a cooling step of cooling the heated cold-rolled steel sheet from the highest heating temperature to 660° C. at a cooling rate of equal to or less than 10° C./s; and a holding step of holding the cooled cold-rolled steel sheet in a temperature range of 550° C. to 660° C. for one minute to 10 minutes.
    Type: Grant
    Filed: October 21, 2011
    Date of Patent: March 21, 2017
    Assignees: NIPPON STEEL & SUMITOMO METAL CORPORATION, TOYOTA JIDOSHA KABUSHIKI KAISHA, AISIN TAKAOKA CO., LTD.
    Inventors: Kunio Hayashi, Toshimitsu Aso, Toshimasa Tomokiyo, Hitoshi Tanino, Ryozo Wada
  • Publication number: 20170051372
    Abstract: The present invention provides a method for manufacturing a hot stamped body having a vertical wall, the method including: a hot-rolling step; a coiling step; a cold-rolling step; a continuous annealing step; and a hot stamping step, in which the continuous annealing step includes a heating step of heating the cold-rolled steel sheet to a temperature range of equal to or higher than Ac1° C. and lower than Ac3° C.; a cooling step of cooling the heated cold-rolled steel sheet from the highest heating temperature to 660° C. at a cooling rate of equal to or less than 10° C./s; and a holding step of holding the cooled cold-rolled steel sheet in a temperature range of 550° C. to 660° C. for one minute to 10 minutes.
    Type: Application
    Filed: October 28, 2016
    Publication date: February 23, 2017
    Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Toshimasa TOMOKIYO, Kunio HAYASHI, Toshimitsu ASO
  • Publication number: 20160375477
    Abstract: A method produces a press-molded article having a hat shaped cross-section with flanges at both sides, a top plate, vertical walls at both sides, and having a shape curved in the vertical direction to an inverted checkmark shape along the longitudinal direction when the molded article is viewed from a side face with the top plate section on the top side. An intermediate molded body is formed by drawing a metal stock sheet into an intermediate shape, and after preparing the outside shape of the intermediate molded body by trimming, drawing is subsequently performed to form the final shape.
    Type: Application
    Filed: December 22, 2014
    Publication date: December 29, 2016
    Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Yasuharu TANAKA, Toshimitsu ASO, Misao OGAWA, Takashi MIYAGI, Shinobu YAMAMOTO