Patents by Inventor Takayuki Yamano

Takayuki Yamano 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: 20220250131
    Abstract: To establish a method for obtaining a hot-press-formed steel member, which exhibits high strength, high tensile elongation (ductility) and high bendability, thereby having excellent deformation characteristics at the time of collision crush (crashworthiness), and which is capable of ensuring excellent delayed fracture resistance. A method for producing a hot-press-formed steel member by heating a steel sheet, which has a chemical component composition containing 0.10% (% by mass, and hereinafter the same shall apply) to 0.30% (inclusive) of C, 1.0% to 2.5% (inclusive) of Si, 1.0% to 3.0% (inclusive) of Si and Al in total and 1.5% to 3.0% (inclusive) of Mn, with the balance consisting of iron and unavoidable impurities, and hot press forming the steel sheet one or more times.
    Type: Application
    Filed: April 25, 2022
    Publication date: August 11, 2022
    Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)
    Inventors: Takayuki YAMANO, Jiro IWAYA, Noriyuki JIMBO, Tatsuya ASAI, Naoki MIZUTA
  • Patent number: 11344941
    Abstract: In a method for obtaining a hot-press-formed steel member, a steel sheet containing 0.10-0.30 mass % of C, 1.0-2.5 mass % of Si, 1.0-3.0 mass % of Si and Al in total, and 1.5-3.0 mass % of Mn is heated at a heating temperature of not less than the Ac3 transformation point. The steel sheet is hot-press formed for one or more times. The starting temperature of the hot pressing is not more than the heating temperature but not less than the Ms point. The average cooling rate from (Ms point?150)° C. to 40° C. is 5° C./s or less. The hot-press-formed steel member has high strength, high tensile elongation, high bendability, excellent deformation characteristics at the time of collision crush, and excellent delayed fracture resistance.
    Type: Grant
    Filed: July 18, 2012
    Date of Patent: May 31, 2022
    Assignee: Kobe Steel, Ltd.
    Inventors: Takayuki Yamano, Jiro Iwaya, Noriyuki Jimbo, Tatsuya Asai, Naoki Mizuta
  • Patent number: 10591347
    Abstract: To measure the mass per unit area of an applied layer in a layered film while preventing a measurement error from being caused by thickness unevenness, a per-unit-area-mass measuring device (30) includes a light projector (31a) configured to project light having a center wavelength of 405 nm, a light projector (31b) configured to project light having a center wavelength of 850 nm, light receivers (32a, 32b) configured to receive light having been transmitted through a separator (12), and a control section (33) configured to calculate the mass per unit area of a heat-resistant layer (4) on the basis of the respective transmitted-light intensities of the light having a center wavelength of 405 nm and the light having a center wavelength of 850 nm.
    Type: Grant
    Filed: June 2, 2016
    Date of Patent: March 17, 2020
    Assignee: SUMITOMO CHEMICAL COMPANY, LIMITED
    Inventors: Takayuki Yamano, Takahiro Okugawa
  • Publication number: 20190105700
    Abstract: In one aspect of the present invention, a mechanical clinched joint component is a mechanical clinched joint component formed of two or more steel sheets, where the component includes at least one joint portion having a peel strength of 0.200 kN/mm or greater, and the component has a hardness of 360 Hv or greater. A method for manufacturing the component sequentially includes heating the two or more steel sheets to an Ac3 temperature or above, and performing mechanical clinch joining so that a carbon equivalent Ceq of the steel sheets, and a bottom-dead-center holding time t and a joining start temperature T during mechanical clinch joining satisfy relationships of equation (1) below and of equation (2) below: Ceq×(0.00209×t+0.000731×T?0.0365)?0.200 ??(1), and Ceq?0.00071×T+0.993 ??(2).
    Type: Application
    Filed: March 8, 2017
    Publication date: April 11, 2019
    Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)
    Inventors: Noriyuki JIMBO, Takayuki YAMANO, Shinichi YAMAMOTO
  • Patent number: 10029294
    Abstract: Provided is a method for manufacturing a hot-press formed steel-member that is capable of reducing LME without causing cracking of a galvanized steel sheet. The method includes using a galvanized steel sheet, as a base steel, having a prescribed chemical composition, heating the galvanized steel sheet to not lower than an Ac3 transformation-point, and executing hot-press forming at least twice after the heating. Every hot-press forming in is executed so that to satisfy the following expression (1): (R/t)>?(a·(T?b)), where “R” is a curvature radius (mm) of a shoulder of a tool used in the hot-press forming, “t” is a thickness (mm) of the galvanized steel sheet, “T” is a forming-start temperature (° C.) of the hot-press forming, “a” is a constant 0.2984, and “b” is a constant 590.
    Type: Grant
    Filed: March 29, 2013
    Date of Patent: July 24, 2018
    Assignee: Kobe Steel, Ltd.
    Inventors: Takayuki Yamano, Noriyuki Jimbo, Tatsuya Asai
  • Publication number: 20180172499
    Abstract: To measure the mass per unit area of an applied layer in a layered film while preventing a measurement error from being caused by thickness unevenness, a per-unit-area-mass measuring device (30) includes a light projector (31a) configured to project light having a center wavelength of 405 nm, a light projector (31b) configured to project light having a center wavelength of 850 nm, light receivers (32a, 32b) configured to receive light having been transmitted through a separator (12), and a control section (33) configured to calculate the mass per unit area of a heat-resistant layer (4) on the basis of the respective transmitted-light intensities of the light having a center wavelength of 405 nm and the light having a center wavelength of 850 nm.
    Type: Application
    Filed: June 2, 2016
    Publication date: June 21, 2018
    Inventors: Takayuki YAMANO, Takahiro OKUGAWA
  • Patent number: 9724745
    Abstract: A press forming process forms a blank, which is the material to be pressed, into a product having a predetermined shape including a continuous hat-shaped section in the longitudinal direction and a curved portion protruding toward the top surface side in the longitudinal direction. In the press forming process, an intermediate product which has an excess thickness portion formed at a part of the curved portion of the product and protruding higher than the top surface of the product is formed while constraining the portion of the intermediate product other than the excess thickness portion until the excess thickness portion projects in a direction opposite to the protrusion direction thereof, whereby the intermediate product is formed into a predetermined shape.
    Type: Grant
    Filed: December 24, 2009
    Date of Patent: August 8, 2017
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Kazuhisa Maeda, Kiyoshi Nonomura, Yoshiyuki Fukuyama, Takayuki Yamano, Jiro Iwaya
  • Patent number: 9550221
    Abstract: A press forming method forming an extended part by extension in a later forming period after deep drawing, the deep drawing process carried out with working at 100-250° C., and the extension forming process carried out colder at less than 50° C., whereby the extended part is formed by extension in a cup shaped low parts formed by deep drawing. Thus, press forming products containing formed elements can be deep drawing formed and extension formed at a high forming rate of 10 mm/sec or greater, which can assure high productivity. By making a steel plate temperature 100-350° C. during press forming and by making the forming rate in the later forming period where extension forming is carried out slower than the forming rate in an earlier forming period where extension forming is not carried out, cracking of the extended part can be prevented and press forming limitations can be improved.
    Type: Grant
    Filed: February 23, 2016
    Date of Patent: January 24, 2017
    Assignee: Kobe Steel, Ltd.
    Inventors: Takayuki Yamano, Jiro Iwaya, Takayuki Kimura, Tatsuya Asai, Naoki Mizuta
  • Patent number: 9463501
    Abstract: A press forming method forming an extended part by extension in a later forming period after deep drawing, the deep drawing process carried out with working at 100-250° C., and the extension forming process carried out colder at less than 50° C., whereby the extended part is formed by extension in a cup shaped low parts formed by deep drawing. Thus, press forming products containing formed elements can be deep drawing formed and extension formed at a high forming rate of 10 mm/sec or greater, which can assure high productivity. By making a steel plate temperature 100-350° C. during press forming and by making the forming rate in the later forming period where extension forming is carried out slower than the forming rate in an earlier forming period where extension forming is not carried out, cracking of the extended part can be prevented and press forming limitations can be improved.
    Type: Grant
    Filed: January 12, 2012
    Date of Patent: October 11, 2016
    Assignee: Kobe Steel, Ltd.
    Inventors: Takayuki Yamano, Jiro Iwaya, Takayuki Kimura, Tatsuya Asai, Naoki Mizuta
  • Publication number: 20160214161
    Abstract: A press forming method forming an extended part by extension in a later forming period after deep drawing, the deep drawing process carried out with working at 100-250° C., and the extension forming process carried out colder at less than 50° C., whereby the extended part is formed by extension in a cup shaped low parts formed by deep drawing. Thus, press forming products containing formed elements can be deep drawing formed and extension formed at a high forming rate of 10 mm/sec or greater, which can assure high productivity. By making a steel plate temperature 100-350° C. during press forming and by making the forming rate in the later forming period where extension forming is carried out slower than the forming rate in an earlier forming period where extension forming is not carried out, cracking of the extended part can be prevented and press forming limitations can be improved.
    Type: Application
    Filed: February 23, 2016
    Publication date: July 28, 2016
    Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)
    Inventors: Takayuki YAMANO, Jiro IWAYA, Takayuki KIMURA, Tatsuya ASAI, Naoki MIZUTA
  • Patent number: 9359663
    Abstract: Provided is a method for manufacturing a hot press formed steel member that has high strengths, an excellent balance between strength and ductility, and good deformation properties upon crush on collision (crashworthiness). The manufacturing method is highly efficient and allows a high degree of freedom with respect to the shape to be formed. The method manufactures a steel member by heating a steel sheet having a specific chemical composition and subjecting the steel sheet to at least one time of hot press forming. In the method, the heating temperature is equal to or higher than the Ac3 transformation temperature, and a starting temperature of the hot press forming is in the range from the heating temperature to martensite start (Ms) temperature. Cooling from [(Ms temperature)?150° C.] down to 80° C. is performed so that a tempering parameter (?) specified by Expression (1) is in the range from 7100 to 8030.
    Type: Grant
    Filed: January 17, 2014
    Date of Patent: June 7, 2016
    Assignee: Kobe Steel, Ltd.
    Inventors: Naoki Mizuta, Tatsuya Asai, Takayuki Yamano, Tetsuji Hoshika
  • Publication number: 20150354035
    Abstract: Provided is a method for manufacturing a hot press formed steel member that has high strengths, an excellent balance between strength and ductility, and good deformation properties upon crush on collision (crashworthiness). The manufacturing method is highly efficient and allows a high degree of freedom with respect to the shape to be formed. The method manufactures a steel member by heating a steel sheet having a specific chemical composition and subjecting the steel sheet to at least one time of hot press forming. In the method, the heating temperature is equal to or higher than the Ac3 transformation temperature, and a starting temperature of the hot press forming is in the range from the heating temperature to martensite start (Ms) temperature. Cooling from [(Ms temperature)?150° C.] down to 80° C. is performed so that a tempering parameter (?) specified by Expression (1) is in the range from 7100 to 8030.
    Type: Application
    Filed: January 17, 2014
    Publication date: December 10, 2015
    Applicant: KABUSHIKI KAISHA KOBE SEIKO SHO (KOBE STEEL, LTD.)
    Inventors: Naoki MIZUTA, Tatsuya ASAI, Takayuki YAMANO, Tetsuji HOSHIKA
  • Publication number: 20150024234
    Abstract: There is provided a method for manufacturing a hot-press formed steel-member, the method being capable of reducing LME without causing cracking of a galvanized steel sheet. The method includes a step of using a galvanized steel sheet, a base steel thereof, having a prescribed chemical composition, a heating step of heating the galvanized steel sheet to not lower than an Ac3 transformation-point, and a hot-press forming step of executing hot-press forming at least twice after the heating step. Furthermore, every hot-press forming in the hot-press forming step is executed in such a way as to satisfy the following expression (1) (R/t)>?(a·(T?b))??(1) where “R” is a curvature radius (mm) of a shoulder of a tool used in the hot-press forming, “t” is a thickness (mm) of the galvanized steel sheet, “T” is a forming-start temperature (° C.) of the hot-press forming, “a” is a constant 0.2984, and “b” is a constant 590.
    Type: Application
    Filed: March 29, 2013
    Publication date: January 22, 2015
    Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)
    Inventors: Takayuki Yamano, Noriyuki Jimbo, Tatsuya Asai
  • Publication number: 20140144560
    Abstract: To establish a method for obtaining a hot-press-formed steel member, which exhibits high strength, high tensile elongation (ductility) and high bendability, thereby having excellent deformation characteristics at the time of collision crush (crashworthiness), and which is capable of ensuring excellent delayed fracture resistance. A method for producing a hot-press-formed steel member by heating a steel sheet, which has a chemical component composition containing 0.10% (% by mass, and hereinafter the same shall apply) to 0.30% (inclusive) of C, 1.0% to 2.5% (inclusive) of Si, 1.0% to 3.0% (inclusive) of Si and Al in total and 1.5% to 3.0% (inclusive) of Mn, with the balance consisting of iron and unavoidable impurities, and hot press forming the steel sheet one or more times.
    Type: Application
    Filed: July 18, 2012
    Publication date: May 29, 2014
    Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steet, Ltd.)
    Inventors: Takayuki Yamano, Jiro Iwaya, Noriyuki JIMBO, Tatsuya Asai, Naoki Mizuta
  • Publication number: 20130263637
    Abstract: A press forming method forming an extended part by extension in a later forming period after deep drawing, the deep drawing process carried out with working at 100-250° C., and the extension forming process carried out colder at less than 50° C., whereby the extended part is formed by extension in a cup shaped low parts formed by deep drawing. Thus, press forming products containing formed elements can be deep drawing formed and extension formed at a high forming rate of 10 mm/sec or greater, which can assure high productivity. By making a steel plate temperature 100-350° C. during press forming and by making the forming rate in the later forming period where extension forming is carried out slower than the forming rate in an earlier forming period where extension forming is not carried out, cracking of the extended part can be prevented and press forming limitations can be improved.
    Type: Application
    Filed: January 12, 2012
    Publication date: October 10, 2013
    Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)
    Inventors: Takayuki Yamano, Jiro Iwaya, Takayuki Kimura, Tatsuya Asai, Naoki Mizuta
  • Publication number: 20120204619
    Abstract: Provided is a press forming method in which the dimensional accuracy is improved and the cost for mass production can be reduced through the reduction of the number of the die corrections, etc. A press forming process forms a blank, which is the material to be pressed, into a product having a predetermined shape including a continuous hat-shaped section in the longitudinal direction and a curved portion protruding toward the top surface side in the longitudinal direction. In the press forming process, an intermediate product which has an excess thickness portion formed at a part of the curved portion of the product and protruding higher than the top surface of the product is formed while constraining the portion of the intermediate product other than the excess thickness portion until the excess thickness portion projects in a direction opposite to the protrusion direction thereof, whereby the intermediate product is formed into a predetermined shape.
    Type: Application
    Filed: December 24, 2009
    Publication date: August 16, 2012
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Kazuhisa Maeda, Kiyoshi Nonomura, Yoshiyuki Fukuyama, Takayuki Yamano, Jiro Iwaya
  • Patent number: 8126658
    Abstract: Provided is a method for rapidly, surely, and easily identifying a factor of a shape defect of an artifact attributed to elastic recovery of deformation upon molding by using the numeric value simulation technique, thereby eliminating lowering of dimension accuracy.
    Type: Grant
    Filed: August 24, 2007
    Date of Patent: February 28, 2012
    Assignees: Toyota Jidosha Kabushiki Kaisha, Kabushiki Kaisha Kobe Seiko Sho
    Inventors: Kiyoshi Nonomura, Jiro Iwaya, Takayuki Yamano
  • Publication number: 20100241366
    Abstract: Provided is a method for rapidly, surely, and easily identifying a factor of a shape defect of an artifact attributed to elastic recovery of deformation upon molding by using the numeric value simulation technique, thereby eliminating lowering of dimension accuracy.
    Type: Application
    Filed: August 24, 2007
    Publication date: September 23, 2010
    Inventors: Kiyoshi Nonomura, Jiro Iwaya, Takayuki Yamano
  • Patent number: 7213437
    Abstract: In a first forming step, a metal sheet placed on, and held by a provisional horizontal flat forming portion of a first forming die part is bent along a provisional bend forming portion of the first forming die part to execute bent-forming such that two arch parts of the metal sheet, having respective protuberances oriented in directions opposite from each other, with protuberance surfaces being butted against a provisional inclined flat forming portion of a second forming die part, and a provisional inclined flat forming portion of the first forming die part, respectively, are coupled with each other, thereby obtaining a provisional formed member comprising a provisional inclined flat portion without any warpage, formed continuously from a provisional horizontal flat portion via a provisional bend, and a flange portion formed continuously from the provisional inclined flat portion so as to form a target angle.
    Type: Grant
    Filed: May 27, 2005
    Date of Patent: May 8, 2007
    Assignee: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)
    Inventors: Akira Osumi, Jiro Iwaya, Takayuki Yamano
  • Patent number: 7117708
    Abstract: A die set for press forming a metal sheet is provided, which comprises: at least a punch; and a die, wherein a punch-die clearance CL2 corresponding to a site to be formed immediately after the initial stage of press forming and a punch-die clearance CL1 corresponding to a site to be formed in the initial stage of press forming are set so as to satisfy the following expressions (1) and (2), respectively: 0.8×t?CL1?1.2×t ??(1) CL2?CL1+t ??(2) where t denotes the thickness of the metal sheet to be formed. This configuration implements a die set for press forming capable of stably generating the reverse bending deformed portion due to overrun even when the die radius is large, minimizing the phenomenon such as wall warp, and enhancing the dimensional accuracy in press forming of a metal sheet, and a press forming method using the die set.
    Type: Grant
    Filed: March 3, 2004
    Date of Patent: October 10, 2006
    Assignee: Kobe Steel, Ltd.
    Inventors: Takayuki Yamano, Jiro Iwaya