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1. 发明公开

EP4035789A1 METHOD FOR MANUFACTURING PRESS-FORMED ARTICLE, PRESS-FORMED ARTICLE, AND PRESS-FORMING DEVICE 审中-公开
公开(公告)号：EP4035789A1
公开(公告)日：2022-08-03
申请号：EP20868504.0
申请日：2020-09-23
申请人： NIPPON STEEL CORPORATION
发明人： KURODA, Ryo , TANAKA, Yasuharu , MIYAGI, Takashi , OGAWA, Misao
IPC分类号： B21D22/20 , B21D22/26 , B21D24/00 , B21D37/08
摘要： A method for manufacturing a press-formed article (100) includes a first step for forming a base sheet portion, a first rising portion, and a first strip portion from a sheet-shaped workpiece having a first edge portion and a second edge portion; and a second step for forming a second rising portion by causing a strip-shaped first zone including the second edge portion to be disposed between a first upper die and a first lower die from both sides, causing a second zone adjacent to the first zone to be disposed between a second upper die and a second lower die from both sides, and moving the first upper die and the first lower die relative to the second upper die and the second lower die, wherein, in the second step, a part of the second rising portion which is connected to a vertical ridge line (108) is shear-deformed.

2. 发明公开

EP3524367A1 METHOD AND DEVICE FOR MANUFACTURING PRESS FORMED ARTICLE 有权
公开(公告)号：EP3524367A1
公开(公告)日：2019-08-14
申请号：EP17858499.1
申请日：2017-10-05
申请人： Nippon Steel Corporation
发明人： MIYAGI, Takashi , TANAKA, Yasuharu , OGAWA, Misao , ASO, Toshimitsu , YAMAMOTO, Takashi
IPC分类号： B21D22/26 , B21D5/01 , B21D22/20 , B21D24/00
摘要： 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. In the pad holding state, (a) a part of a blank 15 to be formed into a top plate 21 is held between a pad 13 and a punch 11, and a part of the blank 15 to be formed into a flange 25 is held between a die 14 and a blank holder 12, (b) in a specific press directional cross section of a part of the blank 15 to be formed into a first part, the position of the contacting surface of the blank holder 12 that makes contact with the blank 15 in the direction of pressing is located toward the punch 11 in the direction of arrangement of the pad 13 and the punch 11, compared with the position of the contacting surface of the pad 13 that makes contact with the blank 15 in the direction of pressing, (c) a vertically-reversing cross-sectional angle is more than 0° and equal to or less than 80°, and (d) in a press directional cross section that is different from the specific press directional cross section, the position of the contacting surface of the pad 13 that makes contact with the blank 15 in the direction of the pressing is located toward the pad 13 in the direction of the arrangement, compared with the position of the contacting surface of the blank holder 12 that makes contact with the blank 15 in the direction of pressing.

3. 发明公开

EP3915694A1 PRESS MOLDING METHOD AND PRESS MACHINE 有权
公开(公告)号：EP3915694A1
公开(公告)日：2021-12-01
申请号：EP20746008.0
申请日：2020-01-24
申请人： NIPPON STEEL CORPORATION
发明人： SUGAWARA, Minoru , TANAKA, Yasuharu , MIYAGI, Takashi , OGAWA, Misao , NATORI, Junki
IPC分类号： B21D22/26 , B21D24/00 , B21D24/04
摘要： A press forming method includes a first step of pinching one part of a metal sheet by means of a die and a pad, and a second step of moving a punch in a direction in which the punch approaches the die relatively to perform press forming on the metal sheet. The die has a first support surface which has an edge including a curved portion. The pad has a second support surface facing the first support surface of the die. The first support surface includes a first flat portion, and a first deformation portion which protrudes or is recessed with respect to the first flat portion. The second support surface includes a second flat portion which faces the first flat portion, and a second deformation portion which is recessed or protrudes with respect to the second flat portion so as to correspond to the first deformation portion. The first deformation portion is provided on a normal line of the curved portion as viewed from a pressing direction. When a space between the first deformation portion and the second deformation portion is assumed to be a deformation space, in the second step, press forming is performed so that portions of the metal sheet which are on both sides of the deformation space flow into the deformation space, and the metal sheet deforms along the first deformation portion and the second deformation portion in the deformation space.

4. 发明公开

EP4227016A1 METHOD FOR MANUFACTURING PRESS-MOLDED ITEM, AND PRESS LINE 审中-实审
公开(公告)号：EP4227016A1
公开(公告)日：2023-08-16
申请号：EP21877763.9
申请日：2021-10-08
申请人： NIPPON STEEL CORPORATION
发明人： SUGAWARA, Minoru , YAMAMOTO, Takashi , TANAKA, Yasuharu , MIYAGI, Takashi , OGAWA, Misao , NATORI, Junki
IPC分类号： B21D22/26 , B21D24/00
摘要： A manufacturing method of a press-formed article (200) including: press-forming a metal sheet into a preformed article (100) including a preformed bottom sheet portion (110), a first preformed standing wall portion (120a), a second preformed standing wall portion (120b), a preformed ridge portion (130) provided between the first preformed standing wall portion (120a) and the second preformed standing wall portion (120b), and a swollen portion (140) provided between the preformed bottom sheet portion (110) and the first and second preformed standing wall portions (120a) and (120b); and press-forming the preformed article (100) into a press-formed article (200) including a bottom sheet portion (210), a first standing wall portion (220a) adjacent to the bottom sheet portion (210), a second standing wall portion (220b) adjacent to the bottom sheet portion (210), and a ridge portion (230) provided between the first standing wall portion (220a) and the second standing wall portion (220b).

5. 发明授权

EP2896467B1 METHOD FOR PRODUCING CURVED ARTICLE 有权转让
公开(公告)号：EP2896467B1
公开(公告)日：2020-08-19
申请号：EP13837955.7
申请日：2013-09-05
申请人： Nippon Steel Corporation
发明人： ASO, Toshimitsu , TANAKA, Yasuharu , MIYAGI, Takashi , OGAWA, Misao , KAWANO, Kazuyuki
IPC分类号： B21D22/26 , B21D24/08 , B21D5/01

6. 发明公开

EP3560618A1 METAL PLATE FORMING METHOD, INTERMEDIATE SHAPE DESIGNING METHOD, METAL PLATE FORMING MOLD, COMPUTER PROGRAM, AND RECORDING MEDIUM 审中-公开
公开(公告)号：EP3560618A1
公开(公告)日：2019-10-30
申请号：EP17889010.9
申请日：2017-12-25
申请人： Nippon Steel Corporation
发明人： TANAKA,Yasuharu , MIYAGI, Takashi , OGAWA, Misao
IPC分类号： B21D22/00 , B21D22/26 , G06F17/50
摘要： A method of forming a metal sheet into a target shape by press-forming, such that the metal sheet is formed into an intermediate shape that is different from the target shape and then the target shape is formed from the intermediate shape, the method includes: when forming the intermediate shape from the metal sheet, forming the intermediate shape by forming a first region including at least a portion at which a ratio of sheet thickness reduction from the metal sheet is larger when the target shape is formed via the intermediate shape than when the target shape is formed directly from the metal sheet.

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