公开(公告)号：US12054113B2

公开(公告)日：2024-08-06

申请号：US17607909

申请日：2019-12-27

Applicant: JFE STEEL CORPORATION

Inventor： Kazuhiko Higai ,  Tsuyoshi Shiozaki ,  Yoshikiyo Tamai

IPC: B60R19/18 ,  B62D21/15 ,  B62D25/08 ,  B62D29/00

CPC classification number: B60R19/18 ,  B62D21/152 ,  B62D25/08 ,  B62D29/005

Abstract: An automotive crashworthiness energy absorption part provided at a front part or a rear part of an automotive body and absorbing crashworthiness energy by undergoing axial crush when receiving input of a crashworthiness load from a front or a rear of the automotive body includes: a tubular member configured to absorb crashworthiness energy by undergoing axial crush, the tubular member including a top portion and side wall portions continuous with the top portion; and resin coated or patched on first outer surfaces including at least outer surfaces of the top portion and the side wall portions of the tubular member. The coated or patched resin has a thickness of 8 mm or less after being heated, forms at least part of a peripheral wall portion of a closed cross section space, and is bonded to the first outer surfaces with an adhesive strength of 10 MPa or more.

公开(公告)号：US20190039108A1

公开(公告)日：2019-02-07

申请号：US15999494

申请日：2018-08-21

Applicant: JFE Steel Corporation

Inventor： Kazuhiko Higai ,  Yuji Yamasaki

IPC: B21C37/15 ,  B21D5/01 ,  B21C37/08 ,  B21D53/88

CPC classification number: B21C37/155 ,  B21C37/0815 ,  B21C37/15 ,  B21D5/015 ,  B21D53/88

Abstract: An apparatus that manufactures a closed-structure part includes a bottom portion and left and right side wall portions, including a press-forming die that form a plurality of first out-of-plane deformed portions and bent portions, the first out-of-plane deformed portions being formed in a region of a workpiece corresponding to the bottom portion and arranged along a longitudinal direction, each of the first out-of-plane deformed portions having a recessed shape or a protruding shape; a pad and a punch that squash the first out-of-plane deformed portions by clamping the region of the workpiece corresponding to the bottom portion therebetween, a cross-sectional shape of a pressing portion of the punch being curved along the longitudinal direction; and bending dies that bend the bent portions by pressing the punch into a space therebetween while the region of the workpiece corresponding to the bottom portion is clamped between the pad and the punch.

公开(公告)号：US20150231682A1

公开(公告)日：2015-08-20

申请号：US14368062

申请日：2012-12-18

Applicant: JFE STEEL CORPORATION

Inventor： Yusuke Fujii ,  Toyohisa Shinmiya ,  Yuji Yamasaki ,  Kazuhiko Higai

IPC: B21D22/02

CPC classification number: B21D22/02 ,  B21D22/00 ,  B21D37/20 ,  B21J13/02 ,  B30B12/00 ,  B30B15/02 ,  G01N2203/0067

Abstract: A prediction equation “R0/t(2R/t+(2R/t+1)εf)/2(1−(1+2R/t)εf)” is derived which predicts that bendability-dominated fracture will not occur when the critical surface strain εcritical is not exceeded by a strain on the metal sheet surface causing the occurrence of ductility-dominated fracture that is obtained from the minimum curvature radius R0 of a press-forming mold and the critical strain εf in a plane strain region in a forming limit diagram. The minimum curvature radius R0 of a mold required to prevent the occurrence of bendability-dominated fracture is estimated, and the mold is designed with a curvature radius that is not less than the curvature radius R0.

Abstract translation: 推导出预测方程“R0 / t（2R / t +（2R / t + 1）＆egr; f）/ 2（1-（1 + 2R / t）＆egr; f）”，预测可弯曲性主导的断裂 当金属板表面上的应变没有超过临界表面应变和临界值时，会出现这种情况，导致从压制成形模具的最小曲率半径R0和临界应变σ获得的延性主导断裂的发生 在成形极限图中的平面应变区域。 估计防止产生弯曲性主导断裂所需的模具的最小曲率半径R0，并且将模具设计成具有不小于曲率半径R0的曲率半径。

公开(公告)号：US11235812B2

公开(公告)日：2022-02-01

申请号：US16648037

申请日：2018-08-01

Applicant: JFE STEEL CORPORATION

Inventor： Kazuhiko Higai ,  Takanobu Saito ,  Yoshikiyo Tamai

IPC: B62D25/04 ,  B62D27/02 ,  B62D29/00 ,  B62D25/08

Abstract: An automotive frame part that is an A-pillar-lower part, the A-pillar-lower part including: an outer panel having approximately a T-shape in planar view and a cross section intersecting a portion corresponding to a horizontal side and a vertical side of the T-shape is a hat-shaped cross section including a top portion, a side wall portion, and a flange portion; an inner panel being connected to the flange portion and forming a closed cross section with the outer panel; and plastic stiffening members that each have one end connected to an inner surface of the outer panel and another end connected to an inner surface of the inner panel, wherein the shape and the disposition of the stiffening members are set based on an analysis result from a shape optimization analysis method and each of the stiffening members has a columnar shape or a columnar shape with both end parts bulging.

公开(公告)号：US10160031B2

公开(公告)日：2018-12-25

申请号：US15825953

申请日：2017-11-29

Applicant: JFE Steel Corporation

Inventor： Kazuhiko Higai ,  Toyohisa Shinmiya ,  Yuji Yamasaki

IPC: B21D53/88 ,  B21D9/08 ,  B21D39/02 ,  B21D5/01 ,  B21D5/02 ,  B21D26/033 ,  B21D47/01 ,  B21D11/08

Abstract: A method of forming a closed cross-sectional structure press-forming the plate-shaped workpiece into portions corresponding to bottom portion and left and right side wall portions; and providing bend-facilitating lines at the plurality of bend lines; bending the workpiece in a direction that the portions corresponding to the left and right side wall portions approach each other by pressing a punch into a space between a pair of dies while clamping the portion corresponding to the bottom portion between the punch and a pad in a plate thickness direction; and bending the corresponding portions along the bend-facilitating lines by pressing the corresponding portions against an outer periphery of a plug having an outer peripheral shape the same as a final shape of the closed cross-sectional structure while the plug is placed on the portion of the workpiece corresponding to the bottom portion.

公开(公告)号：US09333549B2

公开(公告)日：2016-05-10

申请号：US14368062

申请日：2012-12-18

Applicant: JFE STEEL CORPORATION

Inventor： Yusuke Fujii ,  Toyohisa Shinmiya ,  Yuji Yamasaki ,  Kazuhiko Higai

IPC: B21D22/02 ,  B21D37/20 ,  B30B15/02 ,  B30B12/00 ,  B21J13/02

CPC classification number: B21D22/02 ,  B21D22/00 ,  B21D37/20 ,  B21J13/02 ,  B30B12/00 ,  B30B15/02 ,  G01N2203/0067

Abstract: A prediction equation “R0/t≧(2R/t+(2R/t+1)εf)/2(1−(1+2R/t)εf)” is derived which predicts that bendability-dominated fracture will not occur when the critical surface strain εcritical is not exceeded by a strain on the metal sheet surface causing the occurrence of ductility-dominated fracture that is obtained from the minimum curvature radius R0 of a press-forming mold and the critical strain εf in a plane strain region in a forming limit diagram. The minimum curvature radius R0 of a mold required to prevent the occurrence of bendability-dominated fracture is estimated, and the mold is designed with a curvature radius that is not less than the curvature radius R0.

Abstract translation: 推导出预测方程“R0 /t≥（2R / t +（2R / t + 1）＆egr; f）/ 2（1-（1 + 2R / t）＆egr; f）”，预测弯曲性主导的断裂 当金属板表面上的应变不超过临界表面应变和临界应变时，不会发生由压制成形模具的最小曲率半径R0和临界应变σ产生的延性主导断裂的发生。 f在成形极限图中的平面应变区域。 估计防止产生弯曲性主导断裂所需的模具的最小曲率半径R0，并且将模具设计成具有不小于曲率半径R0的曲率半径。

公开(公告)号：US20150165511A1

公开(公告)日：2015-06-18

申请号：US14403323

申请日：2013-05-23

Applicant: JFE Steel Corporation

Inventor： Kazuhiko Higai ,  Toyohisa Shinmiya ,  Yuji Yamasaki

IPC: B21D53/88 ,  B21D9/08 ,  B21D5/02

CPC classification number: B21D53/88 ,  B21D5/015 ,  B21D5/02 ,  B21D9/08 ,  B21D11/08 ,  B21D26/033 ,  B21D39/02 ,  B21D47/01

Abstract: A workpiece is formed into a shape having curvatures in the longitudinal and width directions required for a final closed cross-sectional shape, and bend-facilitating lines are provided at positions corresponding to bent lines in the closed cross-sectional shape. The workpiece formed in the first step is bent in a direction that left and right side wall portions approach each other by clamping the bottom portions between a punch and pad in the plate thickness direction and by pressing a punch into a space between dies. A plug having an outer shape the same as the final closed cross-sectional shape is placed on the bottom portion of the workpiece formed in the second step, and the bottom portion and the left and right side wall portions are bent along the bend-facilitating lines by pressing the bottom portion and the left and right side wall portions against a periphery of the plug.

Abstract translation: 工件被形成为在最终封闭截面形状所需的纵向和宽度方向上具有曲率的形状，并且弯曲方向线设置在与闭合截面形状的弯曲线对应的位置处。 在第一步骤中形成的工件通过在板厚度方向上夹紧冲头和焊盘之间的底部部分并且通过将冲头压入模具之间的空间而沿着左右侧壁部分彼此靠近的方向弯曲。 具有与最终封闭截面形状相同的外形的插头被放置在形成在第二步骤中的工件的底部上，并且底部和左右侧壁部分沿弯曲方向弯曲 通过将底部和左右侧壁部分压靠在插塞的周边上来进行线。

公开(公告)号：US20150114070A1

公开(公告)日：2015-04-30

申请号：US14403379

申请日：2013-05-23

Applicant: JFE Steel Corporation

Inventor： Kazuhiko Higai ,  Toyohisa Shinmiya ,  Yuji Yamasaki

IPC: B21J5/02 ,  B21D5/04 ,  B21J13/02

CPC classification number: B21J5/025 ,  B21D5/01 ,  B21D5/015 ,  B21D5/04 ,  B21D26/033 ,  B21D39/02 ,  B21D47/01 ,  B21J13/02

Abstract: A workpiece is formed into a curved shape that has curvatures in the longitudinal and width directions required for a final closed cross-sectional shape. The formed workpiece is bent in a direction that left and right side wall portions approach each other by clamping the bottom portions between a punch and pad in a plate-thickness direction. A pair of flange portions are butted against each other while the formed bottom portions of the workpiece are placed on a pad; and a die cavity having the same shape as the final closed cross-sectional shape is defined between a support surface of the pad supporting the bottom portion and pressing surfaces of a pair of pressure cams pressing the left and right side wall portions. Then, the pair of flange portions are depressed toward the cavity using depressing portions of a second punch disposed above the pair of flange portions.

Abstract translation: 工件形成为在最终封闭截面形状所需的纵向和宽度方向上具有曲率的弯曲形状。 形成的工件通过在板厚度方向上夹紧冲头和焊盘之间的底部而使左右侧壁部彼此靠近的方向弯曲。 一对凸缘部彼此相对，同时将形成的工件底部放置在垫上; 并且在支撑底部的垫的支撑表面和按压左右侧壁部分的一对压力凸轮的按压表面之间限定具有与最终闭合截面形状相同形状的模腔。 然后，使用设置在上述一对凸缘部上方的第二冲头的压下部，将一对凸缘部向空腔内压入。

公开(公告)号：US20220081033A1

公开(公告)日：2022-03-17

申请号：US17299488

申请日：2019-09-06

Applicant: JFE Steel Corporation

Inventor： Kazuhiko Higai ,  Tsuyoshi Shiozaki ,  Yoshikiyo Tamai

IPC: B62D21/15 ,  B62D29/00 ,  B60R19/18 ,  B60R19/34

Abstract: An automotive crashworthiness energy absorptive part to be provided at a front portion or a rear portion of an automotive body, the automotive crashworthiness energy absorptive part including: a tubular member configured to be axially crushed to absorb crashworthiness energy, the tubular member having a top portion and side wall portions continuous to the top portion; and a resin configured to coat or patch at least inner surfaces of the top portion and the side wall portions of the tubular member, wherein the coated or patched resin has a thickness of 8 mm or less after being heated and forms at least a part of a peripheral wall portion in a closed cross-sectional space, and adheres to the inner surfaces with an adhesive strength of 10 MPa or more.

公开(公告)号：US20150375288A1

公开(公告)日：2015-12-31

申请号：US14847288

申请日：2015-09-08

Applicant: JFE Steel Corporation

Inventor： Kazuhiko Higai ,  Yuji Yamasaki ,  Takaaki Hira ,  Katsuhiro Ochi

IPC: B21D39/03

CPC classification number: B21D39/03 ,  B21D5/10 ,  B21D39/00 ,  B21D39/037 ,  B21D39/04 ,  B21D39/048 ,  B23K1/00 ,  B23K1/14 ,  B23K1/16 ,  B23K1/18 ,  B30B7/04

Abstract: A closed structure part includes a body having a predetermined closed section formed by pressing a blank of a metal plate; and a latch flange portion formed by bending one of two joint ends of the body so that the joint end overlaps an outer surface of the other joint end and latches the other joint end, wherein the joint end and the other joint end overlap in contact and are respectively disposed in singular and continuous planes.

Abstract translation: 闭合结构部件包括：具有通过压制金属板的坯料形成的预定的封闭部分的主体; 以及通过弯曲本体的两个接合端之一形成的闩锁凸缘部分，使得接合端部与另一接头端部的外表面重叠并锁定另一接头端部，其中接头端部和另一接头端部接触重叠， 分别设置在单一和连续的平面中。