Patents by Inventor Takashi Ariga
Takashi Ariga 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: 20230057735Abstract: A manufacturing method of a press forming product, includes: constraining a first face of an intermediate formed product, the intermediate formed product including the first face, a raised face, and a first ridgeline located between the first face and the raised face, and performing flange forming of press forming the raised face into a second face, a flange, and a second ridgeline located between the second face and the flange, wherein: the first ridgeline extends while being convexly curved in a direction from the raised face toward the first face, and the second ridgeline extends while being convexly curved in a direction from the flange toward the second face, viewed from a press direction of the press forming; a convex direction of the first ridgeline in a cross section along the press direction intersecting with the first ridgeline and a convex direction of the second ridgeline in a cross section along the press direction intersecting with the second ridgeline are on the same side; a curvature radius, oType: ApplicationFiled: December 17, 2020Publication date: February 23, 2023Applicant: NIPPON STEEL CORPORATIONInventors: Soma SONOBE, Satoshi SHIRAKAMI, Takashi ARIGA
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Patent number: 10713401Abstract: There is provided a surface shape defect generating region estimating method for estimating a generating region of a surface shape defect of a deformation-processed product obtained by performing deformation processing with respect to a workpiece, the method including: a first stress distribution obtaining process of obtaining first stress distribution ?(T1); a second stress distribution obtaining process of obtaining a second stress distribution ?(T2); a comparative stress distribution obtaining process of obtaining comparative stress distribution ?(T1, T2); a division comparative stress distribution obtaining process of obtaining division comparative stress distribution ?DIV(T1, T2); and a surface shape defect generating region estimating process of estimating whether or not each of the divided regions DK is a generating region of the surface shape defect.Type: GrantFiled: January 22, 2016Date of Patent: July 14, 2020Assignee: NIPPON STEEL CORPORATIONInventors: Takuya Kuwayama, Takashi Ariga
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Patent number: 10543521Abstract: Disclosed is a press forming method press forming a workpiece between a die and a punch, while pushing the punch into the die by means of a relative motion of the die and the punch, the method includes: producing an intermediate molding (100B) having ridges (100d) formed in predetermined parts of the workpiece, and then press forming the intermediate molding (100B) into a final shape, to thereby substantially thicken and work-harden the predetermined parts of the workpiece.Type: GrantFiled: November 1, 2016Date of Patent: January 28, 2020Assignee: NIPPON STEEL CORPORATIONInventors: Shigeru Yonemura, Akihiro Uenishi, Shin Toyokawa, Takuya Kuwayama, Takashi Ariga
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Patent number: 10427633Abstract: [Object] To improve load resistance performance in response to collision. [Solution] An end structure of a vehicle according to the present invention includes: a beam 2 that extends in a vehicle width direction; and a connecting structure 3 that connects the beam 2 to a vehicle body frame. In a cross-sectional view perpendicular to the vehicle width direction, the beam 2 includes a first top surface part 2a and a first bottom surface part 2b which face each other, a first side surface part 2c that connects one ends of the first top surface part 2a and the first bottom surface part 2b, and first flange parts 2d that are formed to protrude vertically outwardly at the other ends of the first top surface part 2a and the first bottom surface part 2b.Type: GrantFiled: February 1, 2016Date of Patent: October 1, 2019Assignee: NIPPON STEEL CORPORATIONInventors: Yutaka Mikazuki, Eiji Isogai, Kenji Yamamoto, Takashi Ariga, Seiya Ishii
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Publication number: 20180265025Abstract: [Object] To improve load resistance performance in response to collision. [Solution] An end structure of a vehicle according to the present invention includes: a beam 2 that extends in a vehicle width direction; and a connecting structure 3 that connects the beam 2 to a vehicle body frame. In a cross-sectional view perpendicular to the vehicle width direction, the beam 2 includes a first top surface part 2a and a first bottom surface part 2b which face each other, a first side surface part 2c that connects one ends of the first top surface part 2a and the first bottom surface part 2b, and first flange parts 2d that are formed to protrude vertically outwardly at the other ends of the first top surface part 2a and the first bottom surface part 2b.Type: ApplicationFiled: February 1, 2016Publication date: September 20, 2018Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Yutaka MIKAZUKI, Eiji ISOGAI, Kenji YAMAMOTO, Takashi ARIGA, Seiya ISHII
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Publication number: 20180075177Abstract: An apparatus for identification of a cause of occurrence of springback having a press forming analyzer for numerically analyzing forming conditions of press forming to obtain forming data of a press formed part, a springback analyzer for numerically analyzing said forming data to calculate a springback value, and a processor for processing at least one of a physical property value and physical property quantity data of part of the regions of said press formed part among forming data of said press formed part and making said springback analyzer calculate the springback value based on the results of said processing.Type: ApplicationFiled: August 29, 2017Publication date: March 15, 2018Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Tohru YOSHIDA, Shunji HIWATASHI, Seiichi DAIMARU, Yasuharu TANAKA, Takashi ARIGA, Toshiyuki NIWA, Yukihisa KURIYAMA, Satoru OKAYAMA
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Patent number: 9868145Abstract: A forming simulation method of an elastic-plastic material, which includes: calculating an element equivalent nodal force vector from stress tensor using a finite element method for one or a plurality of finite elements of a target configuration of the elastic-plastic material; and calculating the total equivalent nodal force vector of areas by integrating the element equivalent nodal force vector for the calculated one or more finite elements over all the areas or specified areas of the elastic-plastic material.Type: GrantFiled: July 29, 2009Date of Patent: January 16, 2018Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Noriyuki Suzuki, Takashi Ariga, Akihiro Uenishi, Shigeru Yonemura
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Publication number: 20180004873Abstract: There is provided a surface shape defect generating region estimating method for estimating a generating region of a surface shape defect of a deformation-processed product obtained by performing deformation processing with respect to a workpiece, the method including: a first stress distribution obtaining process of obtaining first stress distribution ?T1; a second stress distribution obtaining process of obtaining a second stress distribution ?(T2); a comparative stress distribution obtaining process of obtaining comparative stress distribution ?(T1, T2); a division comparative stress distribution obtaining process of obtaining division comparative stress distribution ?(T1, T2); and a surface shape defect generating region estimating process of estimating whether or not each of the divided regions DK is a generating region of the surface shape defect.Type: ApplicationFiled: January 22, 2016Publication date: January 4, 2018Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Takuya KUWAYAMA, Takashi ARIGA
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Patent number: 9767234Abstract: A method of identification of a cause of occurrence of springback comprising a press forming analysis step of numerically analyzing forming conditions of press forming to obtain forming data of a press formed part, a processing step of processing at least one of a physical property value and physical property quantity data of part of the regions of said press formed part among forming data of said press formed part, and a springback value calculation step of calculating a springback value based on the results of said processing.Type: GrantFiled: August 30, 2007Date of Patent: September 19, 2017Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Tohru Yoshida, Shunji Hiwatashi, Seiichi Daimaru, Yasuharu Tanaka, Takashi Ariga, Toshiyuki Niwa, Yukihisa Kuriyama, Satoru Okayama
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Publication number: 20170056949Abstract: Disclosed is a press forming method press forming a workpiece between a die and a punch, while pushing the punch into the die by means of a relative motion of the die and the punch, the method includes: producing an intermediate molding (100B) having ridges (100d) formed in predetermined parts of the workpiece, and then press forming the intermediate molding (100B) into a final shape, to thereby substantially thicken and work-harden the predetermined parts of the workpiece.Type: ApplicationFiled: November 1, 2016Publication date: March 2, 2017Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Shigeru YONEMURA, Akihiro UENISHI, Shin TOYOKAWA, Takuya KUWAYAMA, Takashi ARIGA
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Patent number: 9511403Abstract: Disclosed is a press forming method press forming a workpiece between a die and a punch, while pushing the punch into the die by means of a relative motion of the die and the punch, the method includes: producing an intermediate molding (100B) having ridges (100d) formed in predetermined parts of the workpiece, and then press forming the intermediate molding (100B) into a final shape, to thereby substantially thicken and work-harden the predetermined parts of the workpiece.Type: GrantFiled: May 16, 2012Date of Patent: December 6, 2016Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Shigeru Yonemura, Akihiro Uenishi, Shin Toyokawa, Takuya Kuwayama, Takashi Ariga
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Patent number: 8783721Abstract: A metallic hollow columnar member with a polygonal cross-section having at least five vertices and sides extending between the vertices, is disclosed. The polygonal cross-section is divided by two vertices (A, B) with small inside angles into two perimeter segments with a perimeter comprising one or more sides, and at least one of the two perimeter segments contains at least four sides. The respective inside angles of at least three vertices (V(i)) included in the perimeter segment which includes the at least four sides are equal to or less than 180°, the distance (SS(i)) between each of the at least three vertices (V(i)) and a straight line (L) connecting the two vertices (A, B) is shorter than ½ of the distance between the two vertices (A, B), and the inside angle of the vertex (C) with the smallest inside angle among the at least three vertices (V(i)) is larger than the inside angles of the two vertices (A, B).Type: GrantFiled: March 30, 2012Date of Patent: July 22, 2014Assignee: Nippon Steel & Sumitomo Metal CorporationInventors: Satoshi Hirose, Takashi Ariga, Shigeru Yonemura
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Publication number: 20140182349Abstract: Disclosed is a press forming method press forming a workpiece between a die and a punch, while pushing the punch into the die by means of a relative motion of the die and the punch, the method includes: producing an intermediate molding (100B) having ridges (100d) formed in predetermined parts of the workpiece, and then press forming the intermediate molding (100B) into a final shape, to thereby substantially thicken and work-harden the predetermined parts of the workpiece.Type: ApplicationFiled: May 16, 2012Publication date: July 3, 2014Inventors: Shigeru Yonemura, Akihiro Uenishi, Shin Toyokawa, Takashi Ariga
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Publication number: 20140021709Abstract: A metallic hollow columnar member with a polygonal cross-section having at least five vertices and sides extending between the vertices, is disclosed. The polygonal cross-section is divided by two vertices (A, B) with small inside angles into two perimeter segments with a perimeter comprising one or more sides, and at least one of the two perimeter segments contains at least four sides. The respective inside angles of at least three vertices (V(i)) included in the perimeter segment which includes the at least four sides are equal to or less than 180°, the distance (SS(i)) between each of the at least three vertices (V(i)) and a straight line (L) connecting the two vertices (A, B) is shorter than ½ of the distance between the two vertices (A, B), and the inside angle of the vertex (C) with the smallest inside angle among the at least three vertices (V(i)) is larger than the inside angles of the two vertices (A, B).Type: ApplicationFiled: March 30, 2012Publication date: January 23, 2014Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Satoshi Hirose, Takashi Ariga, Shigeru Yonemura
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Patent number: 8589121Abstract: When discretizing an analysis target part into plural elements and performing analysis, sheet thickness reduction rate or maximum principal strain at an equivalent position including a same element is compared by either a manner of combining two adjacent elements after the analysis or a manner of changing an element discretization size with two types and performing the analysis, and the element where the difference is large is extracted as a fracture risk portion. With this structure, a fracture risk portion can be extracted reliably when a fracture is predicted by a finite element method.Type: GrantFiled: April 14, 2008Date of Patent: November 19, 2013Assignee: Nippon Steel & Sumitomo Metal CorporationInventors: Akihiro Uenishi, Takashi Ariga, Shigeru Yonemura, Jun Nitta, Tohru Yoshida
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Patent number: 8439429Abstract: Provided is a coupling structure between a front pillar and a side sill of an automobile, which improves the steering stability of the automobile and realizes a high productivity. A reinforcing member 8 is provided inside a front pillar 1 having a closed cross-section so as to extend in the front-rear direction of the automobile. The reinforcing member 8 is coupled to a front pillar outer 2. An end portion of the reinforcing member 8 at the rear side of the automobile is extended toward a side sill 4 to form a reinforcing member extension 8a. The reinforcing member extension 8a is coupled to a side sill outer 5.Type: GrantFiled: September 28, 2012Date of Patent: May 14, 2013Assignees: Unipres Corporation, Nippon Steel & Sumitomo Metal CorporationInventors: Masato Shida, Isao Satsukawa, Kouji Chiba, Syu Hashimoto, Takeo Kusunoki, Kenta Konishi, Masaki Itoga, Takashi Ariga, Noriyuki Suzuki, Toshiyuki Niwa
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Patent number: 8419090Abstract: A vehicular metal absorber for efficiently absorbing by a short stroke the impact energy received from legs of a pedestrian at the time of a collision between a pedestrian and an automobile, reducing the residual crush, and protecting the legs of the pedestrian, that is, a long vehicular metal absorber comprising a center flange, a top web and bottom web connected to the two sides of the center flange, a top flange connected to the top web, and a bottom flange connected to the bottom web and formed overall into a hat shaped cross-section, wherein an internal angle ?1 formed by the top web with a flange plane including the top flange and bottom flange and an internal angle ?2 formed by the bottom web with the flange plane are respectively over 0 degree to less than 90 degrees, and in that one or both of the top web and bottom web are provided with a recessed or projecting bead substantially parallel to a front-back direction of a vehicle.Type: GrantFiled: March 28, 2008Date of Patent: April 16, 2013Assignees: Unipres Corporation, Nippon Steel & Sumitomo Metal CorporationInventors: Koji Nojima, Isao Satsukawa, Takashi Ariga, Akihiro Uenishi, Toshiyuki Niwa
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Publication number: 20110172803Abstract: A forming simulation method of an elastic-plastic material, which includes: calculating an element equivalent nodal force vector from stress tensor using a finite element method for one or a plurality of finite elements of a target configuration of the elastic-plastic material; and calculating the total equivalent nodal force vector of areas by integrating the element equivalent nodal force vector for the calculated one or more finite elements over all the areas or specified areas of the elastic-plastic material.Type: ApplicationFiled: July 29, 2009Publication date: July 14, 2011Inventors: Noriyuki Suzuki, Takashi Ariga, Akihiro Uenishi, Shigeru Yonemura
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Publication number: 20100121621Abstract: When discretizing an analysis target part into plural elements and performing analysis, sheet thickness reduction rate or maximum principal strain at an equivalent position including a same element is compared by either a manner of combining two adjacent elements after the analysis or a manner of changing an element discretization size with two types and performing the analysis, and the element where the difference is large is extracted as a fracture risk portion. With this structure, a fracture risk portion can be extracted reliably when a fracture is predicted by a finite element method.Type: ApplicationFiled: April 14, 2008Publication date: May 13, 2010Inventors: Akihiro Uenishi, Takashi Ariga, Shigeru Yonemura, Jun Nitta, Tohru Yoshida
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Publication number: 20100066106Abstract: A vehicular metal absorber for efficiently absorbing by a short stroke the impact energy received from legs of a pedestrian at the time of a collision between a pedestrian and an automobile, reducing the residual crush, and protecting the legs of the pedestrian, that is, a long vehicular metal absorber comprising a center flange, a top web and bottom web connected to the two sides of the center flange, a top flange connected to the top web, and a bottom flange connected to the bottom web and formed overall into a hat shaped cross-section, wherein an internal angle ?1 formed by the top web with a flange plane including the top flange and bottom flange and an internal angle ?2 formed by the bottom web with the flange plane are respectively over 0 degree to less than 90 degrees, and in that one or both of the top web and bottom web are provided with a recessed or projecting bead substantially parallel to a front-back direction of a vehicle.Type: ApplicationFiled: March 28, 2008Publication date: March 18, 2010Inventors: Koji Nojima, Isao Satsukawa, Takashi Ariga, Akihiro Uenishi, Toshiyuki Niwa