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公开(公告)号：US20210260640A1
公开(公告)日：2021-08-26
申请号：US17256734
申请日：2019-06-14
Applicant: JFE Steel Corporation
Inventor： Yusuke Fujii , Yuji Yamasaki
Abstract: A preformed shape capable of suppressing occurrence of cracks and wrinkles in a metal sheet can be determined by simple means. A metal sheet is press formed into a three-dimensionally shaped component. A method therefor includes a first step of press forming the metal sheet into an intermediate component having a preformed shape including a shape of the three-dimensionally shaped component crushed under a load applying condition for applying load in a direction in which at least a part of the three-dimensionally shaped component is straightened and a second step of press forming the intermediate component into the three-dimensionally shaped component.
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公开(公告)号：US20210023601A1
公开(公告)日：2021-01-28
申请号：US17041845
申请日：2019-02-25
Applicant: JFE Steel Corporation
Inventor： Yuta Kariyazaki , Yuji Yamasaki
IPC: B21D22/02
Abstract: There is a need to suppress falling or rising of an end of a press-formed product and twisting of the press-formed product due to springback to suppress a shape defect of the press-formed product due to the springback and, in designing a shape of a press-formed product produced by press-forming a sheet material, a curvature radius (R1) of a concave curved portion and a curvature radius (R2) of a convex curved portion of a concave and convex curved shape of an additional shape arranged on the press-formed product where the concave curved portion and the convex curved portion are continuous are set to be the same.
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公开(公告)号：US20200238355A1
公开(公告)日：2020-07-30
申请号：US16634997
申请日：2018-07-25
Applicant: JFE Steel Corporation
Inventor： Shunsuke Tobita , Toyohisa Shinmiya , Yuji Yamasaki
Abstract: A method for manufacturing a press formed product is disclosed. The method for manufacturing a press formed product includes: when a metal sheet is press formed to manufacture a product having a product shape of a hat-shaped cross-section, in which a top plate part and a flange part are continuous in a width direction through a side wall part and the top plate part and the flange part curve convexly or concavely toward the top plate part along a longitudinal direction, a first step of manufacturing an intermediate component by press forming into a component shape having a hat-shaped cross-section, in which a curve of each of the top plate part and the flange part along the longitudinal direction has a second curvature radius smaller than a curvature radius in the product shape; and a second step of press forming the intermediate component into the product shape.
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公开(公告)号：US10220428B2
公开(公告)日：2019-03-05
申请号：US15106724
申请日：2014-10-21
Applicant: JFE STEEL CORPORATION
Inventor： Yusuke Fujii , Toyohisa Shinmiya , Eiji Iizuka , Yuji Yamasaki
Abstract: A press forming method forms a metal plate into the part shape having at least a top surface portion and side wall portions continuous with both left and right sides of the top surface portion, the part shape having a U-shaped or hat-shaped cross section and having one or two or more bent portions bent in a longitudinal direction that is a direction intersecting the cross section. The press forming method includes: a first step of applying in-plane shear deformation to a plate portion on both sides or one side of the bent portions in the longitudinal direction of the metal plate, the in-plane shear deformation corresponding to a direction of bending the portion of the part shape; and a second step of implementing press forming for the metal plate into the part shape, the metal plate to which the in-plane shear deformation has been applied.
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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
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.
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46.发明申请PRESS MOLDING METHOD, MANUFACTURING METHOD FOR PRESS-MOLDED COMPONENT, AND METHOD FOR DETERMINING PREFORM SHAPE FOR USE IN SAID METHODS 审中-公开压制成型方法，压制成形件的制造方法以及用于确定方法中使用预制件形状的方法
公开(公告)号：US20160354825A1
公开(公告)日：2016-12-08
申请号：US15114534
申请日：2015-01-26
Applicant: JFE STEEL CORPORATION
Inventor： Toyohisa Shinmiya , Tsuyoshi Shiozaki , Eiji Iizuka , Yuji Yamasaki
IPC: B21D22/02
Abstract: A method is provided for press forming a product having a shape of a top board portion, a vertical wall portion continuously formed from the top board portion and a flange portion continuously formed from the vertical wall portion at a press process of two or more stages, wherein a convex or concave bead shape is preformed in a position of a flat metal sheet as a raw material corresponding to a neighborhood of a position generating breakage or flange wrinkles when the raw material is formed into a product shape, and thereafter a product shape is press formed from the raw material having the preformed bead shape.
Abstract translation: 提供了一种压制成型的方法，该产品具有顶板部分的形状，从顶板部分连续形成的垂直壁部分和在两个或多个阶段的压制过程中从垂直壁部分连续形成的凸缘部分， 其特征在于，在将原料形成为产品形状时，在作为原料的平面状金属板的位置上形成有凸起或凹状的胎圈形状，所述原料对应于产生断裂或凸缘褶皱的位置附近，产品形状为 由具有预制珠形的原料形成的压制件。
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47.发明申请
公开(公告)号：US20160160311A1
公开(公告)日：2016-06-09
申请号：US14903818
申请日：2014-07-08
Applicant: JFE STEEL CORPORATION
Inventor： Kinya Nakagawa , Yasuhiro Kishigami , Yuji Yamasaki
IPC: C21D9/50 , B21B15/00 , F16L9/02 , C22C38/46 , C21D6/00 , C22C38/44 , C22C38/42 , B23K11/087 , C21D7/13
Abstract: By using, as a raw material, a thick hot-rolled steel sheet having a chemical composition containing, by mass %, C: 0.02% or more and 0.10% or less, Si: 0.05% or more and 0.30% or less, Mn: 0.80% or more and 2.00% or less, and Nb: 0.010% or more and 0.100% or less and satisfying the condition that a carbon equivalent Ceq is 0.25% or more and 0.50% or less, a microstructure including a bainitic ferrite phase and/or a bainite phase, a high strength of 52 ksi or more in terms of yield strength and a high toughness of −45° C. or lower in terms of fracture transition temperature vTrs, an electric resistance weld zone having a microstructure including a bainitic ferrite phase and/or a bainite phase and satisfying the condition that the ratio of the average crystal grain size of the coarsest-grain portion to the average crystal grain size of the finest-grain portion is 2.0 or less in every portion in the wall thickness direction is obtained.
Abstract translation: 通过使用以质量％计含有C：0.02％以上且0.10％以下，Si：0.05％以上且0.30％以下的化学成分的粗制热轧钢板作为原料，使用Mn ：0.80％以上且2.00％以下，Nb：0.010％以上且0.100％以下，并且满足碳当量为0.005％以上且0.50％以下的条件，包含贝氏体铁素体相 和/或贝氏体相，在屈服强度方面为52ksi以上的高强度，在断裂转变温度vTrs方面为-45℃以下的高韧性或更低的韧性，具有微结构的电阻焊接区域包括 贝氏体铁素体相和/或贝氏体相，并且满足最粗颗粒部分的平均晶粒尺寸与最细粒部分的平均晶粒尺寸的比率在壁的每个部分中为2.0或更小的条件 获得厚度方向。
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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
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。
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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
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。
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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
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。
