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公开(公告)号：US20230150002A1
公开(公告)日：2023-05-18
申请号：US17914990
申请日：2020-12-01
Applicant: JFE STEEL CORPORATION
Inventor： Yusuke FUJII , Masaki URABE
CPC classification number: B21D22/26 , B21D22/201
Abstract: A press forming method includes: press forming a press formed product including a top portion, a side wall portion continuous from the top portion through a punch shoulder portion, and a flange portion continuous from the side wall portion through a die shoulder portion, the press formed product including a curved portion that is concave and curved in a top view; and increasing a bending radius of the punch shoulder portion in the curved portion from a center of a curve toward an end side of the curve.
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公开(公告)号：US20220088663A1
公开(公告)日：2022-03-24
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：US20150290694A1
公开(公告)日：2015-10-15
申请号：US14648534
申请日：2013-12-27
Applicant: JFE STEEL CORPORATION
Inventor： Masaki URABE
IPC: B21D19/08
Abstract: A press forming method presses and forms a formed part including: a top portion having a projecting outer edge, a part of the projecting outer edge projecting outward; and a flange portion that formed by bending along the projecting outer edge of the top portion. The press forming method includes: a first forming step of forming, at a region of a blank material in which the flange portion is to be formed, a preformed part including a vertical wall portion to be a part of the flange portion and a trough portion that is bent outward from the vertical wall portion and recessed on a side of the top portion; and a second forming step of forming the flange portion by bending a region including the trough portion of the preformed part formed in the first forming step.
Abstract translation: 压制成形方法压制并形成成形部，包括：顶部，其具有突出的外边缘，突出的外边缘的一部分向外突出; 以及通过沿着顶部的突出外边缘弯曲而形成的凸缘部。 冲压成形方法包括：第一成形步骤，在要形成凸缘部分的坯件材料的区域形成预成型件，该预成型件包括作为凸缘部分的一部分的垂直壁部分和槽部分 其从垂直壁部分向外弯曲并在顶部的一侧凹陷; 以及第二形成步骤，通过弯曲包括形成在第一成形步骤中的预成形部分的谷部的区域来形成凸缘部分。
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公开(公告)号：US20220219217A1
公开(公告)日：2022-07-14
申请号：US17606202
申请日：2020-04-16
Applicant: JFE STEEL CORPORATION
Inventor： Takeshi OGAWA , Masaki URABE , Eiji IIZUKA
Abstract: A method and apparatus for identifying a portion that is a factor causing a discrepancy in springback amount between a press-formed product and a CAE analysis. The method includes a formed product driving stress distribution acquisition step of acquiring a driving stress distribution of a press-formed product, an analysis driving stress distribution acquisition step of acquiring a driving stress distribution of a springback analysis, a stress difference distribution setting step of setting a stress difference distribution, a stress difference springback amount acquisition step of acquiring a springback amount based on the stress difference distribution, a changed stress difference springback amount acquisition step of acquiring a springback amount by changing a value in a region of the stress difference distribution, and a springback amount discrepancy factor portion identification step of identifying a portion that is a factor causing a discrepancy in springback amount by comparing the acquired springback amounts.
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公开(公告)号：US20220152680A1
公开(公告)日：2022-05-19
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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Patent Agency Ranking
公开(公告)号：US20240378345A1
公开(公告)日：2024-11-14
申请号：US18691657
申请日：2022-09-27
Applicant: JFE STEEL CORPORATION
Inventor： Yusuke FUJII , Taira NAKAMOTO , Masaki URABE
IPC: G06F30/23 , G06F113/24 , G06F119/14
Abstract: A method of predicting a shape change of a press-formed product, includes: generating a blank model which is divided into a plurality of pieces in a sheet thickness direction such that the blank model can be analyzed; acquiring a shape and residual stress in the sheet thickness direction of the press-formed product immediately after the spring back by performing press forming analysis and spring back analysis using the blank model and a die model; setting a value of residual stress relaxed and reduced to an element or an integration point of a sheet thickness surface layer of the press-formed product immediately after spring back; and determining a shape in which moment of force is balanced in the press-formed product for which a value of residual stress of only the sheet thickness surface layer has been set to be relaxed and reduced.
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公开(公告)号：US20240042505A1
公开(公告)日：2024-02-08
申请号：US18265910
申请日：2021-08-06
Applicant: JFE STEEL CORPORATION
Inventor： Yusuke FUJII , Masaki URABE , Shunsuke TOBITA
Abstract: A shape change prediction method of a press formed part predicts a shape change in which an end side in a longitudinal direction is twisted due to stress relaxation with a lapse of time after springback at a moment of die release from a tool of press forming with respect to the press formed part having a U-shaped cross-sectional shape including a top portion and side wall portions, and includes: acquiring a shape and a residual stress of the press formed part immediately after the springback by a springback analysis of the press formed part; setting a value of stress relaxed and reduced compared to the residual stress immediately after the springback for at least one of the side wall portions; and acquiring a shape with which moment of force is balanced for the press formed part in which the value of the relaxed and reduced stress is set.
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公开(公告)号：US20230100401A1
公开(公告)日：2023-03-30
申请号：US17799782
申请日：2020-10-02
Applicant: JFE STEEL CORPORATION
Inventor： Yusuke FUJII , Masaki URABE , Shunsuke TOBITA
IPC: 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：US20220222398A1
公开(公告)日：2022-07-14
申请号：US17613386
申请日：2020-04-22
Applicant: JFE STEEL CORPORATION
Inventor： Takeshi OGAWA , Masaki URABE , Eiji IIZUKA
Abstract: A method and device for specifying a portion causing a discrepancy in springback amount between CAE analysis and an actual formed product. The method includes a formed-product-driving-stress-distribution acquisition step of acquiring a driving stress distribution of a press-formed product, an analysis-driving-stress-distribution acquisition step of acquiring a driving stress distribution in springback analysis, a formed-product springback-amount acquisition step of acquiring a springback amount based on the formed product driving stress distribution, a stress-substituted-springback-amount acquisition step of substituting a value of analysis driving stress in a region with a value of formed product driving stress in a corresponding region and acquiring a springback amount based on a stress substituted distribution obtained by the substitution, and a springback-amount-discrepancy-causing-portion specifying step of finding a difference between the formed product springback amount and the stress substituted springback amount and specifying, based on the difference found, a portion causing a discrepancy in springback amount.
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公开(公告)号：US20210162480A1
公开(公告)日：2021-06-03
申请号：US17268145
申请日：2019-06-04
Applicant: JFE STEEL CORPORATION
Inventor： Masaki URABE
Abstract: A method of press forming that forms a press-formed product into a target shape, the method including: forming a top portion; forming a side wall portion and a flange portion such that a side wall height of the side wall portion of the press-formed product becomes larger than a side wall height of the target shape, where the side wall height of the side wall portion is formed to be larger than the side wall height of the target shape by adding a value half or less of a radius of curvature of the ridge, in a longitudinal direction vertical cross section, of the target shape; and reforming a ridge between the side wall portion and the flange portion such that the side wall height of the side wall portion becomes the side wall height of the target shape.
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