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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：US20250077739A1
公开(公告)日：2025-03-06
申请号：US18727141
申请日：2022-11-10
Applicant: JFE STEEL CORPORATION
Inventor： Takeshi OGAWA , Satoshi SUMIKAWA , Yuji YAMASAKI , Toyohisa SHINMIYA
IPC: G06F30/23 , G06F30/17 , G06F113/24 , G06F119/02
Abstract: An analysis accuracy evaluation method includes: generating, based on measurement data obtained by measurement of a shape after die release of an actual press-formed part press-formed with a predetermined tool of press forming by utilization of an actual blank taken from a metal sheet having shape variation; generating an actual blank model having a same shape as the actual blank based on measurement data; acquiring a press-formed part shape after die release as an analysis press-formed part shape by performing, by using the actual blank model, a press-forming analysis of when press forming is performed with a model of a tool of press forming which model has a same shape as the predetermined tool of press forming; and comparing the actual press-formed part shape and the analysis press-formed part shape, obtaining a deviation amount of shape change of the both shapes, and evaluating accuracy of the press-forming analysis.
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3.发明申请公开(公告)号：US20230113628A1
公开(公告)日：2023-04-13
申请号：US17913742
申请日：2021-03-18
Applicant: JFE STEEL CORPORATION
Inventor： Eiji IIZUKA , Toyohisa SHINMIYA , Takeshi OGAWA
IPC: B21D22/26
Abstract: A technology capable of suppressing end cracking due to a delayed fracture without restrictions on the target pressed component shape. When it is estimated that the end cracking due to the delayed fracture in an end of a material to be pressed is concerned, double cutting processing including performing cutting processing of the end containing at least a place where the end cracking is concerned twice is provided as preprocessing for the press forming causing the concern about the end cracking. The double cutting processing includes performing, in first cutting, cutting to form a partial beam-shaped projection portion at a position containing the place where the end cracking is concerned, and cutting the projection portion in second cutting.
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Patent Agency Ranking
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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5.发明申请公开(公告)号：US20250012562A1
公开(公告)日：2025-01-09
申请号：US18712807
申请日：2022-11-08
Applicant: JFE STEEL CORPORATION
Inventor： Takeshi OGAWA , Satoshi SUMIKAWA , Yuji YAMASAKI , Toyohisa SHINMIYA
Abstract: A press forming analysis method includes: generating a first shape having a same shape as an actual press formed part based on measurement data obtained by measuring a shape after die release of the actual press formed part, the actual press formed part being press-formed with a predetermined tool of press forming by using an actual blank taken from the metal sheet having the shape variation; acquiring a shape of a press formed part after die release as a second shape by performing press forming analysis in a case where press forming is performed with a tool-of-press-forming model having a same shape as the predetermined tool of press forming by using a flat blank model having a flat shape; and determining a portion where both the shapes deviate from each other and a deviation amount by comparing the second shape and the first shape with each other.
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6.发明申请公开(公告)号：US20250001479A1
公开(公告)日：2025-01-02
申请号：US18708859
申请日：2022-11-08
Applicant: JFE STEEL CORPORATION
Inventor： Takeshi OGAWA , Satoshi SUMIKAWA , Yuji YAMASAKI , Toyohisa SHINMIYA
Abstract: A press forming analysis method predicts an influence of a shape variation of a blank taken from a metal sheet having the shape variation when press forming is performed by using the blank and includes: acquiring a shape of a press formed part after die release as a first shape by performing press forming analysis when press forming is performed with a predetermined tool-of-press-forming model by using a flat blank model; generating a shape variation blank model corresponding to the shape variation; acquiring a shape of a press formed part after die release as a second shape by performing press forming analysis when press forming is performed with the predetermined tool-of-press-forming model by using the shape variation blank model; and acquiring a portion where both of the first and second shapes deviate from each other and a deviation amount by comparing the first and second shapes.
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7.发明申请公开(公告)号：US20250053706A1
公开(公告)日：2025-02-13
申请号：US18722202
申请日：2022-11-09
Applicant: JFE STEEL CORPORATION
Inventor： Takeshi OGAWA , Satoshi SUMIKAWA , Yuji YAMASAKI , Toyohisa SHINMIYA
IPC: G06F30/23 , G06F30/17 , G06F113/24 , G06F119/18
Abstract: A press forming analysis method includes: a first blank generation step of generating a standard waveform blank model; a first shape acquisition step of acquiring a first shape, which is a shape of press-formed part using standard waveform blank; a second blank generation step of generating a cycle deviation waveform blank model; a second shape acquisition step of acquiring a second shape, which is a shape of press-formed part using cycle deviation waveform blank; and a deviation amount acquisition step of obtaining a portion where both of the shapes deviate from each other and a deviation amount by comparing the first shape with the second shape.
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8.发明申请公开(公告)号：US20250044082A1
公开(公告)日：2025-02-06
申请号：US18719451
申请日：2022-11-08
Applicant: JFE STEEL CORPORATION
Inventor： Takeshi OGAWA , Satoshi SUMIKAWA , Toyohisa SHINMIYA , Yuji YAMASAKI
Abstract: A press forming analysis method includes: (a) acquiring a shape of a standard press-formed part; (b) generating a waveform blank model; (c) acquiring a shape of a waveform blank press-formed part; (d) comparing the shape of the standard press-formed part and the shape of the waveform blank press-formed part, and obtaining a deviation amount of shape change; (e) generating one or more types of cycle deviation waveform blank models; (f) acquiring a shape of a cycle deviation waveform blank press-formed part; (g) comparing the shape of the standard press-formed part with one or more types of the shape of the cycle deviation waveform blank press-formed part, and obtaining a deviation amount of shape change; and (h) identifying, as a portion requiring countermeasures, a portion having a deviation amount of shape change exceeding a threshold among the deviation amounts of shape change obtained in (d) and (g).
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