Patents by Inventor Satoshi Sumikawa
Satoshi Sumikawa has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20250077739Abstract: 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.Type: ApplicationFiled: November 10, 2022Publication date: March 6, 2025Applicant: JFE STEEL CORPORATIONInventors: Takeshi OGAWA, Satoshi SUMIKAWA, Yuji YAMASAKI, Toyohisa SHINMIYA
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Publication number: 20250053706Abstract: 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.Type: ApplicationFiled: November 9, 2022Publication date: February 13, 2025Applicant: JFE STEEL CORPORATIONInventors: Takeshi OGAWA, Satoshi SUMIKAWA, Yuji YAMASAKI, Toyohisa SHINMIYA
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Publication number: 20250044082Abstract: 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).Type: ApplicationFiled: November 8, 2022Publication date: February 6, 2025Applicant: JFE STEEL CORPORATIONInventors: Takeshi OGAWA, Satoshi SUMIKAWA, Toyohisa SHINMIYA, Yuji YAMASAKI
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Publication number: 20250012562Abstract: 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.Type: ApplicationFiled: November 8, 2022Publication date: January 9, 2025Applicant: JFE STEEL CORPORATIONInventors: Takeshi OGAWA, Satoshi SUMIKAWA, Yuji YAMASAKI, Toyohisa SHINMIYA
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Publication number: 20250001479Abstract: 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.Type: ApplicationFiled: November 8, 2022Publication date: January 2, 2025Applicant: JFE STEEL CORPORATIONInventors: Takeshi OGAWA, Satoshi SUMIKAWA, Yuji YAMASAKI, Toyohisa SHINMIYA
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Publication number: 20240354473Abstract: A method of predicting a tension-compression reverse loading behavior predicted by determining a model constant of a material model expressing the tension-compression reverse loading behavior of a metal sheet includes acquiring a value of the model constant of a prediction metal sheet by inputting metal materials test data, including a factor related to a uniaxial tension behavior, of the prediction metal sheet to a learned model that has been caused to perform machine learning using, as an input variable, metal materials test data of a learning metal sheet and using, as an output variable, a value of the model constant, which has been determined based on a tension-compression test of the learning metal sheet. The factor related to a uniaxial tension behavior includes point sequence data obtained by discretizing a stress-strain curve of uniaxial tensile test obtained from a uniaxial tensile test.Type: ApplicationFiled: May 30, 2022Publication date: October 24, 2024Applicant: JFE STEEL CORPORATIONInventors: Ryo AGEBA, Satoshi SUMIKAWA
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Patent number: 12117422Abstract: 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.Type: GrantFiled: December 1, 2020Date of Patent: October 15, 2024Assignee: JFE STEEL CORPORATIONInventors: Fumiaki Tamashiro, Satoshi Sumikawa, Masaki Urabe
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Patent number: 12109600Abstract: A press forming method forms a press-formed product having a hat-shaped cross section and includes: a first forming process of press-forming a preformed part in which a portion corresponding to web corresponding to a web portion, and a portion corresponding to side wall corresponding to a side wall portion and including a twisted side wall portion of a twisted shape along the longitudinal direction, are formed, the preformed part including a portion corresponding to convex curve corresponding to a convex curved portion; and a second forming process of press-forming the preformed part into the press-formed product. The twisted side wall portion at the first forming process is twisted such that an angle between the twisted side wall portion and the portion corresponding to web is larger on an end portion side than at a center of the portion corresponding to convex curve in the longitudinal direction.Type: GrantFiled: December 27, 2019Date of Patent: October 8, 2024Assignee: JFE STEEL CORPORATIONInventor: Satoshi Sumikawa
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Patent number: 12036596Abstract: A method includes: forming either one or both of convex and concave bead portions at surface portions corresponding to sites of a side wall portion on both sides of a convex curve site and to sites of a side wall portion on both sides of a concave curve site; and squashing the bead portions, wherein the bead portions formed on both sides of the convex curve site are tilted such that an end part of the bead portion positioned on the convex curve site side is farther from a baseline and the other end part is closer to the baseline; and the bead portions formed on both sides of the concave curve site are tilted such that an end part of the bead portion positioned on the concave curve site side is closer to the baseline and the other end part is farther from the baseline.Type: GrantFiled: August 5, 2019Date of Patent: July 16, 2024Assignee: JFE Steel CorporationInventor: Satoshi Sumikawa
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Patent number: 11998968Abstract: A press forming method forms a press-formed product having a hat-shaped cross section and includes: a first forming process of press-forming a preformed part in which a portion corresponding to web corresponding to a web portion, and a portion corresponding to side wall corresponding to a side wall portion and including a twisted side wall portion of a twisted shape along the longitudinal direction, are formed, the preformed part including a portion corresponding to concave curve corresponding to the concave curved portion; and a second forming process of press-forming the preformed part into the press-formed product. The twisted side wall portion at the first forming process is twisted such that an angle between the twisted side wall portion and the portion corresponding to web is smaller on an end portion side than at a longitudinal center of the portion corresponding to concave curve.Type: GrantFiled: December 27, 2019Date of Patent: June 4, 2024Assignee: JFE STEEL CORPORATIONInventor: Satoshi Sumikawa
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Publication number: 20230152195Abstract: 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.Type: ApplicationFiled: December 1, 2020Publication date: May 18, 2023Applicant: JFE STEEL CORPORATIONInventors: Fumiaki TAMASHIRO, Satoshi SUMIKAWA, Masaki URABE
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Publication number: 20220176435Abstract: A press forming method forms a press-formed product having a hat-shaped cross section and includes: a first forming process of press-forming a preformed part in which a portion corresponding to web corresponding to a web portion, and a portion corresponding to side wall corresponding to a side wall portion and including a twisted side wall portion of a twisted shape along the longitudinal direction, are formed, the preformed part including a portion corresponding to concave curve corresponding to the concave curved portion; and a second forming process of press-forming the preformed part into the press-formed product. The twisted side wall portion at the first forming process is twisted such that an angle between the twisted side wall portion and the portion corresponding to web is smaller on an end portion side than at a longitudinal center of the portion corresponding to concave curve.Type: ApplicationFiled: December 27, 2019Publication date: June 9, 2022Applicant: JFE STEEL CORPORATIONInventor: Satoshi SUMIKAWA
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Publication number: 20220143672Abstract: A press forming method forms a press-formed product having a hat-shaped cross section and includes: a first forming process of press-forming a preformed part in which a portion corresponding to web corresponding to a web portion, and a portion corresponding to side wall corresponding to a side wall portion and including a twisted side wall portion of a twisted shape along the longitudinal direction, are formed, the preformed part including a portion corresponding to convex curve corresponding to a convex curved portion; and a second forming process of press-forming the preformed part into the press-formed product. The twisted side wall portion at the first forming process is twisted such that an angle between the twisted side wall portion and the portion corresponding to web is larger on an end portion side than at a center of the portion corresponding to convex curve in the longitudinal direction.Type: ApplicationFiled: December 27, 2019Publication date: May 12, 2022Applicant: JFE STEEL CORPORATIONInventor: Satoshi SUMIKAWA
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Publication number: 20220055085Abstract: A method includes: forming either one or both of convex and concave bead portions at surface portions corresponding to sites of a side wall portion on both sides of a convex curve site and to sites of a side wall portion on both sides of a concave curve site; and squashing the bead portions, wherein the bead portions formed on both sides of the convex curve site are tilted such that an end part of the bead portion positioned on the convex curve site side is farther from a baseline and the other end part is closer to the baseline; and the bead portions formed on both sides of the concave curve site are tilted such that an end part of the bead portion positioned on the concave curve site side is closer to the baseline and the other end part is farther from the baseline.Type: ApplicationFiled: August 5, 2019Publication date: February 24, 2022Applicant: JFE Steel CorporationInventor: Satoshi Sumikawa
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Patent number: 10737307Abstract: 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.Type: GrantFiled: February 3, 2016Date of Patent: August 11, 2020Assignee: JFE Steel CorporationInventors: Satoshi Sumikawa, Masaki Urabe, Jiro Hiramoto
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Patent number: 10286436Abstract: A method of press forming includes: forming a trench-shaped portion into a product shape with a die and a punch until reaching a first bottom dead center, and forms at least one of: a flange portion subject to shrink flange deformation such that a linear length of the flange portion subject to the shrink flange deformation in a longitudinal direction is shorter than a linear length of a flange portion in the product shape; and a flange portion subject to stretch flange deformation such that a linear length of the flange portion subject to the stretch flange deformation in the longitudinal direction is longer than the linear length of the flange portion in the product shape; and forming the formed flange portion into the product shape with the die and a flange forming die until reaching a second bottom dead center.Type: GrantFiled: April 14, 2014Date of Patent: May 14, 2019Assignee: JFE STEEL CORPORATIONInventors: Satoshi Sumikawa, Akinobu Ishiwatari, Jiro Hiramoto
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Patent number: 10089422Abstract: Displacement or a load is applied to an elastic-plastic material to deform the elastic-plastic material plastically to acquire experimental values of a stress-strain relation. With a kinematic-hardening incremental vector d?ij of a yield surface in an elastic-plastic constitutive model as a predetermined first equation, the elastic-plastic constitutive model being defined as a function of stress and back stress, a computer identifies material constants contained in the elastic-plastic constitutive model with the acquired experimental values. The computer identifies material constants contained in a predetermined second equation on the basis of the acquired experimental values and the predetermined first equation into which the identified material constants are substituted.Type: GrantFiled: February 10, 2014Date of Patent: October 2, 2018Assignee: JFE STEEL CORPORATIONInventors: Satoshi Sumikawa, Akinobu Ishiwatari
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Patent number: 10012555Abstract: A method of identifying a cause of springback includes a step of performing a press forming analysis, a step of performing a springback analysis on the basis of information acquired by the press forming analysis, a step of dividing a shape of a press forming product acquired by the press forming analysis into a plurality of regions, a step of changing Young's modulus in a designated direction in any region of the divided regions, a step of performing the springback analysis on the press forming product whose Young's modulus is changed, a step of acquiring springback amount differences on the basis of multiple springback analysis results, and a step of identifying the cause of the springback on the basis of the acquired springback amount differences.Type: GrantFiled: August 15, 2013Date of Patent: July 3, 2018Assignee: JFE STEEL CORPORATIONInventors: Satoshi Sumikawa, Akinobu Ishiwatari
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Publication number: 20180065164Abstract: 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.Type: ApplicationFiled: February 3, 2016Publication date: March 8, 2018Applicant: JFE STEEL CORPORATIONInventors: Satoshi Sumikawa, Masaki Urabe, Jiro Hiramoto
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Publication number: 20160121384Abstract: A method of press forming includes: forming a trench-shaped portion into a product shape with a die and a punch until reaching a first bottom dead center, and forms at least one of: a flange portion subject to shrink flange deformation such that a linear length of the flange portion subject to the shrink flange deformation in a longitudinal direction is shorter than a linear length of a flange portion in the product shape; and a flange portion subject to stretch flange deformation such that a linear length of the flange portion subject to the stretch flange deformation in the longitudinal direction is longer than the linear length of the flange portion in the product shape; and forming the formed flange portion into the product shape with the die and a flange forming die until reaching a second bottom dead center.Type: ApplicationFiled: April 14, 2014Publication date: May 5, 2016Applicant: JFE STEEL CORPORATIONInventors: Satoshi SUMIKAWA, Akinobu ISHIWATARI, Jiro HIRAMOTO