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公开(公告)号：US11731187B2
公开(公告)日：2023-08-22
申请号：US16966401
申请日：2019-01-15
Applicant: JFE STEEL CORPORATION
Inventor： Yuta Kariyazaki , Yusuke Fujii , Yuji Yamasaki
IPC: G06F30/17 , B21D22/26 , G06F30/20 , G06F119/14 , G06F113/24
CPC classification number: B21D22/26 , G06F30/17 , G06F30/20 , G06F2113/24 , G06F2119/14
Abstract: An object to provide a press-forming method that can efficiently suppress springback and easily specify a position where a springback reduction effect by rigidity improvement is large, and the press-forming method used in producing a press-formed product having a predetermined shape by press-forming a sheet material, the method including: a first process that repeatedly performs a springback analysis, while changing a position to be restricted, to specify a position where a springback reduction effect by rigidity improvement is large; a second process that performs a rigidity improvement measure on a position of the sheet material corresponding to the position of the formed-product model specified in the first process; and a third process that produces the press-formed product by press-forming the sheet material on which the rigidity improvement measure has been performed.
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公开(公告)号：US11731185B2
公开(公告)日：2023-08-22
申请号：US17057306
申请日：2019-05-22
Applicant: JFE Steel Corporation
Inventor： Toyohisa Shinmiya , Yuji Yamasaki
Abstract: A material is press formed into a component shape including a top sheet portion including a curved outer peripheral edge portion curved in such a manner as to be recessed inward, a vertical wall portion, and a flange portion. When a lower die and a pad sandwich a sandwiching region that is a region including at least a part of a region corresponding to the top sheet portion, an upper die is moved in a pressing direction to perform bending while moving the sandwiched material to the vertical wall portion side. A surface of the lower die that sandwiches the sandwiching region is provided with one or more ridgelines for forming bends. The ridgelines are set at positions such that, when the bending is complete, the position of the top sheet portion is located on the vertical wall portion side rather than the positions of the ridgelines.
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公开(公告)号：US11609166B2
公开(公告)日：2023-03-21
申请号：US16640224
申请日：2018-07-13
Applicant: JFE Steel Corporation
Inventor： Yusuke Fujii , Kento Fujii , Yuji Yamasaki
Abstract: There are provided an evaluation method and a prediction method for a technology to be reflected in a press die designing method. A deformation limit evaluation method includes evaluating the deformation limit on a sheared surface of a metal sheet in press-forming the sheared metal sheet. The deformation limit is evaluated and a crack in the sheared surface is predicted based on the relationship between an index value determined from two surface strain distribution gradients of a surface strain distribution gradient in a sheet thickness direction in the sheared surface and a surface strain distribution gradient in a bending ridge line direction by bending in a direction away from the sheared surface at an evaluation position among distributions of strains generated near the boundary between a bending outside surface and the sheared surface of the metal sheet to be bent and a tension generated in the sheared surface.
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公开(公告)号：US10413956B2
公开(公告)日：2019-09-17
申请号：US15115470
申请日：2015-01-23
Applicant: JFE STEEL CORPORATION
Inventor： Toyohisa Shinmiya , Yuji Yamasaki , Eiji Iizuka
Abstract: There is provided a press forming method capable of suppressing a camber back, which occurs in a hat-shaped member while reducing a restriction on a shape of the hat-shaped member. At a time of the press forming, a blank material (4) in which a longitudinal line length is at least longer than a longitudinal line length of a top plate portion of a hat-shaped member (5) is fixed between a pair of press dies (lower die (2), upper die (3)), which have bent surfaces (convex surface (2a), concave surface (3a)), while being warped upward, that is, in a bending direction of the lower die (2) and the upper die (3). Subsequently, for the fixed blank material (4), a bent portion of the hat-shaped member (5) is press formed by using the convex surface (2a) and the concave surface (3a).
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公开(公告)号：US09981298B2
公开(公告)日：2018-05-29
申请号：US14913786
申请日：2014-08-22
Applicant: JFE Steel Corporation
Inventor： Toyohisa Shinmiya , Yasuhiro Kishigami , Yuji Yamasaki
CPC classification number: B21D5/02 , B21C23/12 , B21C35/023 , B21C35/026 , B21D5/10 , B21D11/08 , B21D22/02 , B21D47/01 , B21D47/04
Abstract: A method of producing a polygonal closed cross-section structural component includes press-forming a metal sheet into a gutter-shaped pre-processed part with a curved form along its longitudinal direction having plural ridge lines corresponding to corner portions of the polygonal closed cross-section in a cross-sectional form developed by cutting the component at a position corresponding to the ridge line located at the innermost side in the radial direction to provide a flange portion extending along the ridge line at the resulting respective ends, and press-forming the pre-processed part to deform inwardly in the cross-sectional direction at a position of one or more of the plural ridge lines to butt the ridge lines located at the innermost side and the flange portions to each other.
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Patent Agency Ranking
公开(公告)号：US20180078993A1
公开(公告)日：2018-03-22
申请号：US15825953
申请日：2017-11-29
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 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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7.发明授权公开(公告)号：US09327327B2
公开(公告)日：2016-05-03
申请号：US14403674
申请日：2013-05-24
Applicant: JFE Steel Corporation
Inventor： Toyohisa Shinmiya , Kazuhiko Higai , Yuji Yamasaki , Katsuhiro Ochi
CPC classification number: B21C37/16 , B21C37/0815 , B21C37/185 , B21D5/015 , B21D37/16
Abstract: A method of manufacturing a pipe with different diameters along a longitudinal direction that has a small diameter portion, a large diameter portion, and a diameter-changing portion provided between the small diameter portion and the large diameter portion and is formed by press forming a blank made of a metal sheet includes press forming the blank with a U-shape forming die into a U-shaped formed part and press forming the U-shaped formed part with an O-shape forming die set into a circular cross-section formed part. A length of a vertical wall of the U-shape forming die is longer than a length of a vertical wall portion of the U-shaped formed part. In the O-shape forming die set, a die mating line is inclined downwardly, and a ratio t/D of a sheet thickness t of the blank to a diameter D, which represents a diameter of a portion of the O-shape forming die set corresponding to the small diameter portion and a diameter of a portion of the O-shape forming die set corresponding to the large diameter portion, is 0.010≦t/D≦0.080.
Abstract translation: 一种制造具有小直径部分，大直径部分和设置在小直径部分和大直径部分之间的直径变化部分的沿着纵向具有不同直径的管的方法，通过压制成型坯 由金属片制成，包括用U型成形模将冲压成形为U形成形部，并将O形成形模压制成U形成形部，并将其成型为圆形横截面形成部。 U形成形模的垂直壁的长度比U形成形部的垂直壁部的长度长。 在O形成型模组中，模具配合线向下倾斜，坯料的片材厚度t与直径D的比值t / D，其代表O形成模具的一部分的直径 对应于小直径部分和对应于大直径部分的O形成模具的一部分的直径设定为0.010＆lt; t / D＆nlE; 0.080。
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公开(公告)号：US11052444B2
公开(公告)日：2021-07-06
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：US20200376532A1
公开(公告)日：2020-12-03
申请号：US16636786
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 manufacturing method includes a first step of manufacturing an intermediate component by forming the curved part such that a line length along the longitudinal direction of a curved convex side WA is shorter than a line length in the product shape and a line length along the longitudinal direction of a curved concave side WB is longer than a line length in the product shape; and a second step of forming the intermediate component such that a line length of the curved convex side WA is longer than the line length in the first step and a line length of the curved concave side WB is shorter than the line length in the first step.
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公开(公告)号：US10828683B2
公开(公告)日：2020-11-10
申请号：US15999494
申请日：2018-08-21
Applicant: JFE Steel Corporation
Inventor： Kazuhiko Higai , Yuji Yamasaki
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.
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