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公开(公告)号：US11221272B2
公开(公告)日：2022-01-11
申请号：US16768132
申请日：2018-10-19
Applicant: JFE Steel Corporation
Inventor： Masaki Urabe
IPC: G01M5/00 , G06F30/23 , B21C51/00 , B21D22/00 , G06F119/14 , G06F113/24
Abstract: A springback variation cause analysis method includes: calculating a first stress distribution in a press forming part; calculating a second stress distribution in the press forming part; calculating a difference between the second and the first stress distribution, and replacing and setting the first or the second stress distribution with the calculated stress difference distribution; calculating a first springback amount to be caused in the press forming part; changing a value of stress difference in a partial area of the press forming part in the stress difference distribution set for the press forming part; calculating a second springback amount; and analyzing a portion in the press forming part that is a cause of variation in springback amount in the press forming part due to scattering or variation in press forming conditions, based on the second springback amount and the first springback amount.
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公开(公告)号：US20200309635A1
公开(公告)日：2020-10-01
申请号：US16768132
申请日：2018-10-19
Applicant: JFE Steel Corporation
Inventor： Masaki Urabe
Abstract: A springback variation cause analysis method includes: calculating a first stress distribution in a press forming part; calculating a second stress distribution in the press forming part; calculating a difference between the second and the first stress distribution, and replacing and setting the first or the second stress distribution with the calculated stress difference distribution; calculating a first springback amount to be caused in the press forming part; changing a value of stress difference in a partial area of the press forming part in the stress difference distribution set for the press forming part; calculating a second springback amount; and analyzing a portion in the press forming part that is a cause of variation in springback amount in the press forming part due to scattering or variation in press forming conditions, based on the second springback amount and the first springback amount.
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公开(公告)号：US11911816B2
公开(公告)日：2024-02-27
申请号：US17422276
申请日：2019-10-17
Applicant: JFE STEEL CORPORATION
Inventor： Masaki Urabe
Abstract: A method for identifying a variation factor portion of a springback amount, including: performing press forming analysis under first press forming conditions, and calculating a residual stress distribution in a press formed part; performing springback analysis on the press formed part, and calculating a first springback amount; performing press forming analysis under second press forming conditions, and calculating a residual stress distribution in the press formed part; replacing a value of residual stress in a partial area of the residual stress distribution; performing springback analysis on the press formed part for which the value of the residual stress has been replaced, and calculating a second springback amount; obtaining a difference between the second springback amount and the first springback amount; and identifying a portion in the press formed part that is a factor for variation in springback amount of the press formed part based on the obtained difference.
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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：US09953115B2
公开(公告)日：2018-04-24
申请号：US14436236
申请日：2013-10-10
Applicant: JFE STEEL CORPORATION
Inventor： Osamu Sonobe , Akinobu Ishiwatari , Masaki Urabe , Hirotaka Kano , Jiro Hiramoto
CPC classification number: G06F17/5009 , B21D19/00 , B21D22/02 , B21D53/88 , G01L5/00 , G01M99/007 , G01N3/28 , G01N2203/0075 , G01N2203/0254 , G01N2203/027 , G06F17/10
Abstract: A method for manufacturing a press formed part, the method including specifying stretch flange limit strain in a metal sheet by using strain gradient in a radial direction and strain gradient in a sheet thickness direction. The strain gradient in the radial direction being directed from an end portion of the metal sheet at a time a press load is applied. The strain gradient in the sheet thickness direction being a direction of the metal sheet that intersects a loading direction. Additionally, the stretch flange limit strain satisfies the formula ϵθlim=A[a·Δϵθ/Δr+b·Δϵθ/Δt]+c, where ϵθlim represents the stretch flange limit strain in a tangential direction of the sheet edge, Δϵθ/Δr represents the strain gradient in the radial direction, Δϵθ/Δt represents the strain gradient in the sheet thickness direction, A, a, and b represent influence coefficients, and c represents the limit strain at a time the strain gradient is zero.
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Patent Agency Ranking
公开(公告)号：US12117422B2
公开(公告)日：2024-10-15
申请号：US17916698
申请日：2020-12-01
Applicant: JFE STEEL CORPORATION
Inventor： Fumiaki Tamashiro , Satoshi Sumikawa , Masaki Urabe
Abstract: A method for identifying a necking limit strain of a metal sheet includes a step of measuring the distribution of strain in a tensile orthogonal direction in a tensile deformation process of a notch root for two or more types of sheet specimens having a notch geometry in a portion of a sheet edge; a step of obtaining a strain increment ratio of the notch root in the tensile deformation process and a strain gradient in the tensile orthogonal direction; a step of obtaining necking limit strain at which necking occurs in the notch root based on the strain increment ratio in the tensile deformation process; and a step of identifying the necking limit strain as a function of the strain gradient from the relation between the necking limit strain obtained for the two or more types of sheet specimens and the strain gradient at that time.
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公开(公告)号：US10737307B2
公开(公告)日：2020-08-11
申请号：US15551136
申请日：2016-02-03
Applicant: JFE STEEL CORPORATION
Inventor： Satoshi Sumikawa , Masaki Urabe , Jiro Hiramoto
Abstract: A press forming method according to the present invention includes: a first forming step of forming the press formed part by using the first press forming tool having a line length in the cross-sectional direction of the joining portion contacting with a flange portion subjected to stretch flange deformation or a flange portion subjected to shrink flange deformation is a line length L1 in the cross-sectional direction that is shorter than a line length L2, where the line length L2 is a line length in a cross-sectional direction of the joining portion of the second press forming tool for making the product shape; and a second forming step of forming the press formed part in the product shape by crash forming by using the second press forming tool in which the line length in the cross-sectional direction of the joining portion is L2.
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公开(公告)号：US20180065164A1
公开(公告)日：2018-03-08
申请号：US15551136
申请日：2016-02-03
Applicant: JFE STEEL CORPORATION
Inventor： Satoshi Sumikawa , Masaki Urabe , Jiro Hiramoto
Abstract: A press forming method according to the present invention includes: a first forming step of forming the press formed part by using the first press forming tool having a line length in the cross-sectional direction of the joining portion contacting with a flange portion subjected to stretch flange deformation or a flange portion subjected to shrink flange deformation is a line length L1 in the cross-sectional direction that is shorter than a line length L2, where the line length L2 is a line length in a cross-sectional direction of the joining portion of the second press forming tool for making the product shape; and a second forming step of forming the press formed part in the product shape by crash forming by using the second press forming tool in which the line length in the cross-sectional direction of the joining portion is L2.
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公开(公告)号：US20150298193A1
公开(公告)日：2015-10-22
申请号：US14443744
申请日：2013-10-28
Applicant: JFE STEEL CORPORATION
Inventor： Masaki Urabe
Abstract: A press forming method of press forming a formed part including a top portion having a concave outer edge with a part of the outer edge being concave inwards and a flange portion subjected to bending forming along the concave outer edge of the top portion includes: a first forming step of forming a preformed shape part including, in a part where the flange portion is formed in a blank material, a vertical wall portion that becomes a part of the flange portion and a mountain shaped portion that is bent outwards from the vertical wall portion and is convex towards the top portion; and a second forming step of forming the flange portion by performing bending forming on a part including the mountain shaped portion of the preformed shape part formed at the first forming step along a bending line that is a boundary from the vertical wall portion.
Abstract translation: 一种压制成型方法，其特征在于，包括具有凹形外边缘的顶部，所述顶部具有所述外边缘的一部分向内凹入，并且沿着所述顶部的凹入外边缘弯曲成形的凸缘部分包括：第一 形成预成型的形状部的形成步骤包括在凸缘部形成为坯料的部分中形成成为凸缘部的一部分的垂直壁部和从垂直壁部向外侧弯曲的山形部 并朝向顶部凸出; 以及第二形成步骤，通过沿着与所述垂直壁部分的边界的弯曲线在包括形成在所述第一成形步骤的预成形形状部分的山形部分的部分上进行弯曲成形来形成所述凸缘部。
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公开(公告)号：US20150039247A1
公开(公告)日：2015-02-05
申请号：US14386538
申请日：2013-03-04
Applicant: JFE Steel Corporation
Inventor： Toru Minote , Yuichi Tokita , Yoshikiyo Tamai , Masaki Urabe , Takeshi Fujita
CPC classification number: G01B5/20 , B21D22/208 , B21D53/88 , G01N19/08 , G01N25/72 , G06F17/5018 , G06F17/5095 , G06F2217/41 , G06F2217/42 , G06F2217/44 , G06F2217/46 , Y02T90/50
Abstract: A press-forming analysis method includes a step of analyzing press forming including setting an initial temperature distribution to a heated press-forming metallic sheet, and acquiring shape information, a temperature distribution, a stress distribution, and a strain distribution before mold release, in which a temperature analysis and a structural analysis are coupled; a step of analyzing springback including conducting a springback analysis based on the shape information, the temperature distribution, the stress distribution, and the acquired strain distribution, and acquiring shape information, a temperature distribution, a stress distribution, and a strain distribution after springback; and a step of analyzing cooling stress including restraining particular nodes based on the shape information, the temperature distribution, the stress distribution, and the acquired strain distribution, and analyzing stress distributions during cooling and after the cooling by coupling a temperature analysis and a structural analysis.
Abstract translation: 压制成型分析方法包括对压制成型进行分析的步骤，包括将初始温度分布设定为加热的压制成型金属板，并且获取形状信息，温度分布，应力分布和脱模前的应变分布， 温度分析和结构分析耦合; 分析回弹的步骤，包括基于形状信息，温度分布，应力分布和获取的应变分布进行回弹分析，以及获得回弹后的形状信息，温度分布，应力分布和应变分布; 以及基于形状信息，温度分布，应力分布和获得的应变分布来分析冷却应力的步骤，包括抑制特定节点，以及通过耦合温度分析和结构分析来分析冷却期间和冷却后的应力分布 。
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