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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：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：US11542566B2
公开(公告)日：2023-01-03
申请号：US16473876
申请日：2017-12-15
Applicant: JFE Steel Corporation
Inventor： Yusuke Fujii , Yoshie Nakai , Mikihiro Mori , Takahiko Maeda , Naoki Kikuchi , Noritaka Nishiguchi
Abstract: When performing dephosphorization treatment of hot metal by adding a refining agent as a lime source and an oxygen source (dephosphorizing agent(s) and a gaseous oxygen source into the hot metal accommodated in a hot metal holding container, the refining agent used is a refining agent having an Ig-loss value of from 4.0% by mass to 35.0% by mass and including 60% by mass or more of quicklime.
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公开(公告)号：US12090541B2
公开(公告)日：2024-09-17
申请号：US17799782
申请日：2020-10-02
Applicant: JFE STEEL CORPORATION
Inventor： Yusuke Fujii , Masaki Urabe , Shunsuke Tobita
IPC: B21D22/26
CPC classification number: B21D22/26
Abstract: A press forming method for controlling a shape change of a press formed part over time after the press formed part springs back at a moment of a release from a press-forming die includes: a press forming step of press forming a metal sheet into the press formed part by using the press-forming die; a die releasing step of releasing the press formed part, which is press-formed, from the press-forming die; and a post-release die holding step of holding the released press formed part in a forming bottom dead center shape for 30 minutes or more by using the press-forming die.
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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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Patent Agency Ranking
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：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：US11970212B2
公开(公告)日：2024-04-30
申请号：US17435681
申请日：2019-11-12
Applicant: JFE STEEL CORPORATION
Inventor： Yusuke Fujii , Masaki Urabe
Abstract: An automotive-structural-part joint structure is formed by bending one metal sheet, includes a groove portion including a top portion and a pair of side wall portions, is provided at an end part of one automotive structural part in a longitudinal direction, and is configured to join the one automotive structural part to another automotive structural part in an intersecting direction. The automotive-structural-part joint structure includes: a pair of vertical rib portions configured to stand upward from both side ends of the top portion; and an outward-directed flange portion configured to extend outward from three side edges of the groove portion on an end part side where the other automotive structural part is joined, the flange portion being continuously formed along the three side edges.
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公开(公告)号：US11590591B2
公开(公告)日：2023-02-28
申请号：US16649866
申请日：2018-08-02
Applicant: JFE STEEL CORPORATION
Inventor： Kento Fujii , Yusuke Fujii , Yuji Yamasaki
Abstract: To prevent a crack from occurring on a sheared end face due to press forming, a technology is provided for evaluating and predicting a crack limit of the sheared end face of a metal sheet and determining press forming conditions. In a deformation limit evaluation method for, when deforming by press forming a metal sheet subjected to shearing, evaluating a deformation limit of the sheared end face of the metal sheet, the deformation limit is evaluated by an index value obtained from two stress gradients at an evaluation position among stress distributions occurring in the vicinity of the sheared end face of the metal sheet due to the press forming, which gradients are a stress gradient in a sheet thickness direction and a stress gradient in a direction away from the sheared end face.
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公开(公告)号：US10745771B2
公开(公告)日：2020-08-18
申请号：US16079712
申请日：2017-02-15
Applicant: JFE STEEL CORPORATION
Inventor： Yusuke Fujii , Yoshie Nakai , Naoki Kikuchi , Naoya Shibuta , Shinichi Nagai , Takahiko Maeda , Yuji Miki
Abstract: A molten steel refining method includes throwing a powder to molten steel while heating the powder with a flame formed by combustion of a hydrocarbon gas at the leading end of a top blowing lance. The lance height of the top blowing lance (the distance between the static bath surface of the molten steel and the leading end of the lance) is controlled to 1.0 to 7.0 m, and the dynamic pressure P of a jet flow ejected from the top blowing lance calculated from equation (1) below is controlled to 20.0 kPa or more and 100.0 kPa or less. P=ρg× U2/2 . . . (1) wherein P is the dynamic pressure (kPa) of the jet flow at an exit of the top blowing lance, ρg the density (kg/Nm3) of the jet flow, and U the velocity (m/sec) of the jet flow at the exit of the top blowing lance.
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