Patents by Inventor Yoshiaki Nakazawa
Yoshiaki Nakazawa 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: 11173771Abstract: The present invention provides a shock-absorbing member including: an exterior material 110 for an automobile; a first reinforcing member 122 that is disposed adjacent to the exterior material 110 and whose cross section orthogonal to the extending direction has a height, in the direction orthogonal to the exterior material 110, that is greater than the width in the S direction along the exterior material 110; a second reinforcing member 124 that is disposed adjacent to the exterior material 110 and whose cross section orthogonal to the extending direction has a height, in the direction orthogonal to the exterior material 110, that is greater than the width in the direction along the exterior material 110; an intersecting part where the first reinforcing member 122 and the second reinforcing member intersect and overlap; and a joint that joins the first reinforcing member 122 and the second reinforcing member 124 at the intersection.Type: GrantFiled: January 28, 2019Date of Patent: November 16, 2021Assignee: NIPPON STEEL CORPORATIONInventors: Toshiya Suzuki, Yoshiaki Nakazawa, Tasuku Zeniya, Tohru Yoshida
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Patent number: 11161163Abstract: The method includes treating a metal sheet having a bcc structure and a surface satisfying conditions (a) or (b), molding the metal sheet to cause plane strain tensile deformation and biaxial tensile deformation, and allowing at least one part of the metal sheet to have a sheet thickness decrease rate of from 10% to 30%. Condition (a): an area fraction of crystal grains having a crystal orientation of 15° or less relative to a (001) plane parallel to a surface of the metal sheet is from 0.20 to 0.35. Condition (b): the area fraction of crystal grains having a crystal orientation of 15° or less relative to a (001) plane parallel to a surface of the metal sheet is 0.45 or less, the average crystal grain size thereof is 15 ?m or less. The molded product satisfies conditions (a) or (b).Type: GrantFiled: February 20, 2020Date of Patent: November 2, 2021Assignee: NIPPON STEEL CORPORATIONInventors: Masahiro Kubo, Yoshiaki Nakazawa, Hiroshi Yoshida
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Patent number: 11155305Abstract: A press-molded product capable of improving the bonding strength between a vehicle body reinforcing member and the other member or the rigidity of a vehicle body by enlarging a cross-section of a member to a fullest extent of a design cross-section without forming a notch for preventing a press-molding failure in a ridge-portion flange. A press-molded product is formed by a steel plate having a tensile strength of 340 MPa or more, and includes an inward continuous flange in at least one end portion, the inward continuous flange being obtained by continuously forming a ridge-portion flange, a first flange formed inward in at least a part of an area of the end portion of a first surface portion, and a second flange formed inward in at least a part of an area of the end portion of a second surface portion.Type: GrantFiled: November 30, 2018Date of Patent: October 26, 2021Assignee: NIPPON STEEL CORPORATIONInventors: Yasuhiro Ito, Yoshiaki Nakazawa
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Patent number: 11135902Abstract: [Object] To make it possible to make impact absorption at the time of a collision even when there is no sufficient space. [Solution] An impact absorption member according to the present invention includes: a member that is placed adjacent to an exterior material 110 of an automobile and in which a height in a direction orthogonal to the exterior material is larger than a width in a direction along the exterior material in a cross section orthogonal to an extending direction of the member. By this configuration, a first member 122 and a second member 124 are arranged so as to extend in different directions and be adjacent to the exterior material 110 of an automobile, and therefore impact absorption at the time of a collision can be made even when there is no sufficient space.Type: GrantFiled: July 26, 2017Date of Patent: October 5, 2021Assignee: NIPPON STEEL CORPORATIONInventors: Toshiya Suzuki, Yoshiaki Nakazawa, Yasuhiro Ito, Satoshi Shirakami
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Patent number: 11078550Abstract: A method for manufacturing a quenched molding according to the present disclosure is a method including a first heat treatment process of heating a blanked steel material to a temperature higher than its Ac3 transformation point to perform austenite transformation, and then cooling to induce martensite transformation or bainite transformation, and a second heat treatment process of heating the steel material that has undergone the first heat treatment process to a temperature higher than the Ac3 transformation point to perform austenite transformation, and then cooling to induce martensite transformation. After the steel material has been heated to a temperature higher than the Ac3 transformation point in at least one process from out of the first heat treatment process or the second heat treatment process, molding is completed at a temperature higher than an Ar3 transformation point.Type: GrantFiled: November 22, 2017Date of Patent: August 3, 2021Assignee: NIPPON STEEL CORPORATIONInventors: Yoshiaki Nakazawa, Shinichiro Tabata, Kazuo Hikida, Toshiya Suzuki, Atsuo Koga, Koichi Hamada
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Publication number: 20210220896Abstract: According to the present disclosure, a manufacturing method for a saddle-shaped press-molded article includes curling a blank at a top plate configuration location of the blank that will form a top plate portion, applying the curl with a first force acting from an inner face side toward an outer face side of the blank at the top plate configuration location, applying the curl with a net force configured by second forces acting in mutually facing directions and a third force acting in the opposing direction to the first force at the outer face side of respective vertical wall configuration locations of the blank that will be molded into vertical wall portions, and in a state in which the top plate configuration location is curled, restraining end portion inverted ridge configuration location that will be molded into end portion inverted ridge portion, the top plate configuration location, the vertical wall configuration locations, and end portion flange configuration location that will be molded into end portiType: ApplicationFiled: May 7, 2019Publication date: July 22, 2021Applicant: Nippon Steel CorporationInventors: Satoshi SHIRAKAMI, Yoshiaki NAKAZAWA
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Publication number: 20210205871Abstract: A panel-shaped formed product made of a metal sheet includes a top panel portion, an opening portion, and a vertical wall portion. The top panel portion is polygonal. The opening portion is provided in the top panel portion. The vertical wall portion extends from at least not less than two adjacent borders among the borders of the top panel portion. At least one pair of each vertical wall portion of pairs of adjacent vertical wall portions of the vertical wall portions has a stepped portion. As a result, the panel shaped formed product has fewer defects such as cracks and wrinkles even when it has a shape that is difficult to form.Type: ApplicationFiled: March 23, 2021Publication date: July 8, 2021Inventors: Kenichiro OTSUKA, Yoshiaki NAKAZAWA, Naruhiko NOMURA, Toshiya SUZUKI, Masahiro KUBO
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Publication number: 20210190651Abstract: The present invention addresses an object to provide an embedding apparatus capable of removing an embedding material such as paraffin and solids such as debris of a tissue fragment adhered to a tweezers holder hole easily.Type: ApplicationFiled: May 21, 2019Publication date: June 24, 2021Applicants: SAKURA SEIKI CO., LTD., SAKURA FINETEK JAPAN CO., LTD.Inventors: Masahisa MIMURA, Yoshiaki NAKAZAWA, Mitsuaki NARITA
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Patent number: 11035022Abstract: Provided are a metal sheet, a method of producing a metal sheet, a method of producing a molded product of a metal sheet, and a molded product of a metal sheet, in which occurrence of surface roughness is inhibited. Provided are a metal sheet satisfying conditions (a1), (b1) or (c1) at the surface and a method for producing the metal sheet. Also provided are a method for producing a molded product of a metal sheet using the metal sheet, and a molded product of the metal sheet. (a1) The area fraction of crystal grains having a crystal orientation divergent by 20° or more from a (111) plane and by 20° or more from a (001) plane is from 0.25 to 0.35, and the average crystal grain size is less than 16 ?m. (b1) The area fraction of crystal grains having a crystal orientation divergent by 20° or more from a (111) plane and by 20° or more from a (001) plane is from 0.15 to 0.30, and the average crystal grain size is 16 ?m or more. (c1) The area fraction of crystal grains with a Taylor Factor value from 3.0 to 3.Type: GrantFiled: April 2, 2019Date of Patent: June 15, 2021Assignee: NIPPON STEEL CORPORATIONInventors: Masahiro Kubo, Yoshiaki Nakazawa
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Patent number: 11014139Abstract: A process of pressing a blank to form an intermediate formed component configured including a top plate, the ridge lines at short direction ends of the top plate, and vertical walls facing each other in a state extending from the respective ridge lines and at least one of the vertical walls configuring a curved wall curving as viewed from an upper side of the top plate, such that a step projecting toward an opposite side to a side on which the vertical walls face each other is formed to the curved wall so as to run along a length direction of the top plate. The method includes pressing the intermediate formed component to narrow a projection width of the step, or to move a portion of the curved wall where the vertical walls face each other.Type: GrantFiled: April 21, 2016Date of Patent: May 25, 2021Assignee: NIPPON STEEL CORPORATIONInventors: Masahiro Kubo, Hiroshi Yoshida, Takashi Miyagi, Toshiya Suzuki, Yoshiaki Nakazawa
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Patent number: 11000890Abstract: A panel-shaped formed product made of a metal sheet includes a top panel portion, an opening portion, and a vertical wall portion. The top panel portion is polygonal. The opening portion is provided in the top panel portion. The vertical wall portion extends from at least not less than two adjacent borders among the borders of the top panel portion. At least one pair of each vertical wall portion of pairs of adjacent vertical wall portions of the vertical wall portions has a stepped portion. As a result, the panel shaped formed product has fewer defects such as cracks and wrinkles even when it has a shape that is difficult to form.Type: GrantFiled: December 22, 2015Date of Patent: May 11, 2021Assignee: NIPPON STEEL CORPORATIONInventors: Kenichiro Otsuka, Yoshiaki Nakazawa, Naruhiko Nomura, Toshiya Suzuki, Masahiro Kubo
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Patent number: 10994591Abstract: Provided is a configuration that makes up for a lack of tensile rigidity and a lack of collision properties at the same time. [Solution] An automotive exterior panel according to the present invention: an exterior material 110; and a reinforcing member 120 that is in contact along an automobile inside surface of the exterior material 110 and of which a second moment of area in a direction orthogonal to the exterior material is less than or equal to 15,000 mm4 in a cross section orthogonal to a longitudinal direction of the 10 reinforcing member. By this configuration, the second moment of area in a direction orthogonal to the longitudinal direction of the reinforcing member 120 is made less than or equal to 15,000 mm4, and hence a lack of tensile rigidity can be made up for at the same time.Type: GrantFiled: July 26, 2017Date of Patent: May 4, 2021Assignee: NIPPON STEEL CORPORATIONInventors: Toshiya Suzuki, Yoshiaki Nakazawa, Yasuhiro Ito, Satoshi Shirakami
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Patent number: 10994681Abstract: A bumper beam for a vehicle that is lightweight and high in strength is provided. A bumper beam for a vehicle includes a first member and a second member. The first member includes a first top panel part, two first vertical wall parts, and two first flange parts. The second member includes a second top panel part, two second vertical wall parts, and two second flange parts. The second top panel part includes a protruding part that protrudes toward a side opposite to the first top panel part. The two second vertical wall parts are disposed such that the second vertical wall parts respectively face close the first vertical wall parts inside the first member. The two second flange parts are disposed such that the second flange parts are connected to the two second vertical wall parts and joined to the first flange parts, respectively.Type: GrantFiled: August 15, 2017Date of Patent: May 4, 2021Assignee: NIPPON STEEL CORPORATIONInventors: Atsuo Koga, Yoshiaki Nakazawa
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Publication number: 20210122216Abstract: The present invention provides a shock-absorbing member including: an exterior material 110 for an automobile; a first reinforcing member 122 that is disposed adjacent to the exterior material 110 and whose cross section orthogonal to the extending direction has a height, in the direction orthogonal to the exterior material 110, that is greater than the width in the S direction along the exterior material 110; a second reinforcing member 124 that is disposed adjacent to the exterior material 110 and whose cross section orthogonal to the extending direction has a height, in the direction orthogonal to the exterior material 110, that is greater than the width in the direction along the exterior material 110; an intersecting part where the first reinforcing member 122 and the second reinforcing member intersect and overlap; and a joint that joins the first reinforcing member 122 and the second reinforcing member 124 at the intersection.Type: ApplicationFiled: January 28, 2019Publication date: April 29, 2021Applicant: NIPPON STEEL CORPORATIONInventors: Toshiya SUZUKI, Yoshiaki NAKAZAWA, Tasuku ZENIYA, Tohru YOSHIDA
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Publication number: 20210114074Abstract: A method of producing a hot press-formed product includes subjecting an Al-plated steel sheet having a zinc compound layer or a metallic zinc layer, as an outermost layer, provided on an Al plating layer to hot press forming using a die. The die includes a hard layer having a skewness (Rsk), as measured in a direction from the outside of a die hole toward the inside of the die hole, of 1.3 or less and a hardness Hv_Die of HV 2,000 or more, over the entirety of a region of a steel sheet contact surface that is adjacent to a die shoulder portion. The steel sheet contact surface is a surface located outside of the die hole and configured to contact the Al-plated steel sheet that is to be subjected to the hot press forming.Type: ApplicationFiled: April 9, 2019Publication date: April 22, 2021Applicant: NIPPON STEEL CORPORATIONInventors: Masahiro KUBO, Soshi FUJITA, Yoshiaki NAKAZAWA, Hideaki IRIKAWA, Masahiro FUDA
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Patent number: 10981207Abstract: A hot press device according to the present disclosure includes a first press, a second press, a conveyance device linking the first press and the second press together, and a heating furnace provided within a conveyance range of the conveyance device.Type: GrantFiled: August 31, 2017Date of Patent: April 20, 2021Assignee: NIPPON STEEL CORPORATIONInventors: Naruhiko Nomura, Yoshiaki Nakazawa, Toshiya Suzuki, Yasuhiro Ito, Ryousuke Morimoto
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Publication number: 20210101225Abstract: A weld joint manufacturing method of the present disclosure includes performing current-passing through an aluminum-plated steel sheet provided with an aluminum plating layer while moving a pair of wheel electrodes relative to the aluminum-plated steel sheet by sandwiching the aluminum-plated steel sheet between the pair of wheel electrodes and rotating the pair of wheel electrodes in a circumferential direction; and welding a part of the aluminum-plated steel sheet, where the current-passing has been performed, and another steel sheet, in an overlapped state of the aluminum plating layer with the other steel sheet.Type: ApplicationFiled: March 20, 2018Publication date: April 8, 2021Applicant: NIPPON STEEL CORPORATIONInventors: Tasuku ZENIYA, Masanori YASUYAMA, Yoshiaki NAKAZAWA
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Patent number: 10898938Abstract: This method for manufacturing a panel-like formed article has preparing a blank material made of a metal sheet having a tensile strength of 390 MPa or more and 980 MPa or less; and press-forming the blank material in a cold manner using a pressing apparatus to form the blank material into the panel-like formed article, in the press-forming, a blank holder, a first punch, and a second punch are relatively moved with respect to a die, thereby pressing the first punch and the second punch to the blank material, and pressing of the second punch to the blank material is completed before pressing of the first punch to the blank material.Type: GrantFiled: March 16, 2017Date of Patent: January 26, 2021Assignee: NIPPON STEEL CORPORATIONInventors: Kenichiro Otsuka, Koichi Hamada, Yoshiaki Nakazawa
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Publication number: 20210017623Abstract: Provided are a metal sheet, a method of producing a metal sheet, a method of producing a molded product of a metal sheet, and a molded product of a metal sheet, in which occurrence of surface roughness is inhibited. Provided are a metal sheet satisfying conditions (a1), (b1) or (c1) at the surface and a method for producing the metal sheet. Also provided are a method for producing a molded product of a metal sheet using the metal sheet, and a molded product of the metal sheet. (a1) The area fraction of crystal grains having a crystal orientation divergent by 20° or more from a (111) plane and by 20° or more from a (001) plane is from 0.25 to 0.35, and the average crystal grain size is less than 16 ?m. (b1) The area fraction of crystal grains having a crystal orientation divergent by 20° or more from a (111) plane and by 20° or more from a (001) plane is from 0.15 to 0.30, and the average crystal grain size is 16 ?m or more. (c1) The area fraction of crystal grains with a Taylor Factor value from 3.0 to 3.Type: ApplicationFiled: April 2, 2019Publication date: January 21, 2021Applicant: NIPPON STEEL CORPORATIONInventors: Masahiro KUBO, Yoshiaki NAKAZAWA
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Publication number: 20210001675Abstract: A structural member includes a top sheet portion which has a first edge portion and a second edge portion facing the first edge portion, a wall portion which extends from the second edge portion in a direction intersecting the top sheet portion, and a closed cross-sectional portion which is provided in the first edge portion, in which the first edge portion is curved toward an inside of the top sheet portion in a plan view with respect to the top sheet portion, and when a distance from the first edge portion to the second edge portion of the structural member is referred to as a structural member width, the closed cross-sectional portion forms a closed cross section on a vertical cut plane of the structural member along a direction of the structural member width, the vertical cut plane of the structural member along the direction of the structural member width has an open cross section, and a shape of the vertical cut plane of the structural member including the closed cross-sectional portion is asymmetric wiType: ApplicationFiled: November 27, 2018Publication date: January 7, 2021Applicant: NIPPON STEEL CORPORATIONInventors: Yasuhiro ITO, Yoshiaki NAKAZAWA, Takeshi KAWACHI