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公开(公告)号：US11161163B2
公开(公告)日：2021-11-02
申请号：US16795796
申请日：2020-02-20
IPC分类号： B32B3/00 , B21D22/20 , C21D9/48 , C22C38/14 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/12 , C21D8/02
摘要： 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 μm or less. The molded product satisfies conditions (a) or (b).
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公开(公告)号：US11633772B2
公开(公告)日：2023-04-25
申请号：US17059987
申请日：2019-07-03
发明人： Masahiro Kubo , Naruhiko Nomura , Toshiya Suzuki
摘要： A method of producing a hot press-formed product, in which a die includes a hard layer having a skewness (Rsk), as measured in a direction from the outside of a die hole toward an inside of the die hole, of from −5.0 to 1.2, and a hardness Hv_Die of from HV 1,000 to 1,800, 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 a hot-dip galvannealed steel sheet that is to be subjected to hot press forming.
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公开(公告)号：US11517954B2
公开(公告)日：2022-12-06
申请号：US16552845
申请日：2019-08-27
发明人： Masahiro Kubo , Hiroshi Yoshida , Takashi Miyagi
IPC分类号： B21D22/26 , B21D53/88 , B62D25/04 , B21D22/21 , B21D5/00 , B21D24/04 , B21D22/06 , B62D25/20
摘要： A method for manufacturing a pressed component including an elongated top plate, a wall having one end connected to a short direction end portion of the top plate, that curves with a convex shape bowing toward an opposite side to the top plate as viewed from an upper side of the top plate, and that includes a sharp curve portion, and a flange that is connected to another end of the wall, and that extends in a plate thickness direction of the wall toward the opposite side to the top plate side. The manufacturing method includes pressing to form an intermediate formed component including a preliminary flange and pressing to deform the preliminary flange to form the preliminary flange into the flange.
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公开(公告)号：US11859260B2
公开(公告)日：2024-01-02
申请号：US17419557
申请日：2020-01-07
IPC分类号： C21D9/46 , B32B15/01 , C22C38/00 , C22C38/02 , C22C38/06 , C22C38/44 , C22C38/48 , C22C38/50 , C22C38/54 , C22C38/58 , C21D6/00 , C21D1/18 , C21D8/02
CPC分类号： C21D9/46 , B32B15/01 , C21D1/18 , C21D6/004 , C21D6/005 , C21D6/008 , C21D8/0205 , C21D8/0226 , C21D8/0236 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/06 , C22C38/44 , C22C38/48 , C22C38/50 , C22C38/54 , C22C38/58 , C21D2211/005
摘要： A steel sheet has a predetermined chemical composition, in which a metallographic structure in a surface layer region ranging from a surface to a position of 20 μm from the surface in a sheet thickness direction consists of ferrite and a secondary phase having a volume fraction of 1.0% to 15.0%, the metallographic structure in an internal region ranging from a position of more than 20 μm from the surface in the sheet thickness direction to a ¼ thickness position from the surface in the sheet thickness direction consists of ferrite and a secondary phase having a volume fraction of 5.0% to 25.0%, the volume fraction of the secondary phase in the surface layer region is less than the volume fraction of the secondary phase in the internal region, and in the surface layer region, the average grain size of the secondary phase is 0.5 μm to 4.0 μm.
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公开(公告)号：US10773755B2
公开(公告)日：2020-09-15
申请号：US16495671
申请日：2018-03-20
IPC分类号： B62D29/00 , C21D9/00 , B60J5/04 , B62D21/15 , B62D25/02 , B62D25/04 , B62D25/06 , B62D25/08 , B62D25/20
摘要： A hat member 1 includes a top-plate portion 13, first ridges 113, and two side walls 11. The two side walls have a middle hardness Dc of 300 HV or higher. Each of the two side walls 11 includes a softened portion L and a strength-transition portion T adjacent to the softened portion L. The softened portion L has a hardness Dn lower than the middle hardness Dc by at least 8% (Dc−Dn≥0.08Dc). The strength-transition portion T extends 0.5 mm or longer from the softened portion L toward the first end of the side wall. The strength-transition portion T has a hardness Dt that transitionally changes within the range of 8% to 1% lower than the middle hardness Dc (0.92Dc≤Dt≤0.99Dc). The hat member 1 further includes two second ridges 114 and two flanges 14.
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公开(公告)号：US11998967B2
公开(公告)日：2024-06-04
申请号：US17209473
申请日：2021-03-23
CPC分类号： B21D22/022 , B21D22/22 , B21D22/26 , B21D53/88 , B60J5/04 , B60J5/0413 , B21D22/06
摘要： 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.
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公开(公告)号：US11035022B2
公开(公告)日：2021-06-15
申请号：US17044106
申请日：2019-04-02
发明人： Masahiro Kubo , Yoshiaki Nakazawa
IPC分类号： C22C38/12 , C22C38/14 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/00 , C21D9/48 , B21D22/20 , C21D9/46 , B21B1/22 , C21D6/00 , C21D8/02 , C22C38/08 , C22C38/16 , C22C38/60
摘要： 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 μm. (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 μm or more. (c1) The area fraction of crystal grains with a Taylor Factor value from 3.0 to 3.4, when assuming plane strain tensile deformation in the transverse direction, is from 0.18 to 0.40.
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公开(公告)号：US20200094885A1
公开(公告)日：2020-03-26
申请号：US16495671
申请日：2018-03-20
摘要： A hat member 1 includes a top-plate portion 13, first ridges 113, and two side walls 11. The two side walls have a middle hardness Dc of 300 HV or higher. Each of the two side walls 11 includes a softened portion L and a strength-transition portion T adjacent to the softened portion L. The softened portion L has a hardness Dn lower than the middle hardness Dc by at least 8% (Dc−Dn≥0.08Dc). The strength-transition portion T extends 0.5 mm or longer from the softened portion L toward the first end of the side wall. The strength-transition portion T has a hardness Dt that transitionally changes within the range of 8% to 1% lower than the middle hardness Dc (0.92Dc≤Dt≤0.99Dc). The hat member 1 further includes two second ridges 114 and two flanges 14.
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公开(公告)号：US11491528B2
公开(公告)日：2022-11-08
申请号：US15733831
申请日：2019-07-03
发明人： Masahiro Kubo , Naruhiko Nomura , Toshiya Suzuki
摘要： A method of producing a hot press-formed product, in which a 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 from −5.0 to 1.2, and a hardness Hv_Die of from HV 1,000 to 1,550, 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 a plated steel sheet (a plated steel sheet including at least one kind of plating layer selected from the group consisting of a hot-dip galvanizing layer and a zinc nickel plating layer) that is to be subjected to hot press forming.
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公开(公告)号：US10449590B2
公开(公告)日：2019-10-22
申请号：US15567719
申请日：2016-04-21
发明人： Masahiro Kubo , Hiroshi Yoshida , Takashi Miyagi
IPC分类号： B21D22/26 , B21D53/88 , B21D5/00 , B21D24/04 , B21D22/21 , B62D25/04 , B21D22/06 , B62D25/20
摘要： A method for manufacturing a pressed component including an elongated top plate, a wall having one end connected to a short direction end portion of the top plate, that curves with a convex shape bowing toward an opposite side to the top plate as viewed from an upper side of the top plate, and that includes a sharp curve portion, and a flange that is connected to another end of the wall, and that extends in a plate thickness direction of the wall toward the opposite side to the top plate side. The manufacturing method includes pressing to form an intermediate formed component including a preliminary flange and pressing to deform the preliminary flange to form the preliminary flange into the flange.
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