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公开(公告)号：EP3939712A1
公开(公告)日：2022-01-19
申请号：EP20769722.8
申请日：2020-03-13
发明人： FUJII Kento , SHINMIYA Toyohisa , YAMASAKI Yuji
摘要： Provided is a pressing technology for reducing tensile residual stress generated on a sheared edge face of a metal sheet after press forming in order to prevent occurrence of a delayed fracture on the sheared edge face. A pressed component manufacturing method for manufacturing a pressed component by press-forming a metal sheet having a sheared edge face includes a first press forming step in which it is estimated that tensile residual stress is generated in a direction along the sheared edge on a portion of the sheared edge face of the metal sheet after die release, in which the method includes, as a subsequent step to the first press forming step, a tensile residual stress relaxation step (5) of bulging, in the sheet thickness direction, a region that includes at least a site on a sheared edge face where it is estimated that the tensile residual stress is generated.
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公开(公告)号：EP3858510A1
公开(公告)日：2021-08-04
申请号：EP19880411.4
申请日：2019-06-28
发明人： MIYAKE Hiroto , SHINMIYA Toyohisa , YAMASAKI Yuji
摘要： Provided are a press formed component that does not easily cause wrinkling on a vertical wall portion of a curved portion in a component shape having an L-shape, a T-shape, or the like when viewed in a plan view and a method for manufacturing the same. A press formed component (20) includes a top sheet portion (1), a vertical wall portion (2) continuous to the top sheet portion (1), and a flange portion (3) and also includes a curved portion (4) in which when viewed in a plan view, at least a part of a boundary portion (5) between the top sheet portion (1) and the vertical wall portion (2) is displaced to the vertical wall portion (2) side and curved concavely toward a longitudinal direction. In a cross-sectional shape of the curved portion (4), an inclination angle θ [deg] of the vertical wall portion (2) with respect to the top sheet portion (1) satisfies expression (1) below: 1 − sin θ / cos θ > 0.95
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3.发明公开
公开(公告)号：EP4414686A1
公开(公告)日：2024-08-14
申请号：EP22892523.6
申请日：2022-10-19
摘要： To provide a jig and a test piece capable of assessing a delayed fracture in a sheared end surface more accurately and easily, and a method for assessing a delayed fracture using the same. A jig (1) for assessing a delayed fracture applies a tensile load to a test piece (10) having pin holes (10A, 10B) opened on both sides in a longitudinal direction, and is installed in a hydrogen intrusion environment together with a test piece (10) restrained in a load state. A first pin (2) that penetrates one pin hole (10A) and a second pin (3) that penetrates the other pin hole (10B), a frame component (5) provided with first insertion holes (5Aa, 5Ba) into which each of both end portions of the first pin (2) is inserted; a slide component (6) provided with second insertion holes (6Aa, 6Ba) into which both end portions of the second pin (3) are inserted, and a tensile force adjustment mechanism configured to connect the slide component (6) to the frame component (5) to be able to advance and retreat along the longitudinal direction of the test piece (10), in which the tensile force adjustment mechanism is a feeding screw mechanism that moves linearly with rotation of a screw (7).
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公开(公告)号：EP4239313A1
公开(公告)日：2023-09-06
申请号：EP21900254.0
申请日：2021-07-29
摘要： To further enhance the evaluation accuracy of a delayed fracture. Focusing on the fact that a calculated stress value serving as the reference for the occurrence of the delayed fracture changes depending on analysis conditions of a forming analysis, a value obtained by changing a stress value serving as the reference for the occurrence of the delayed fracture according to the analysis conditions for analyzing an intended formed article (article for practical use) is used as the reference for evaluating the delayed fracture. For example, analysis conditions of a forming analysis in an evaluation test of the delayed fracture are matched with analysis conditions of a forming analysis of an article for practical use represented by an actual automobile component.
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5.发明授权
公开(公告)号：EP2916122B1
公开(公告)日：2019-10-02
申请号：EP13851774.3
申请日：2013-10-30
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公开(公告)号：EP3974078A1
公开(公告)日：2022-03-30
申请号：EP20809032.4
申请日：2020-02-14
发明人： MIYAKE Hiroto , SHINMIYA Toyohisa , YAMASAKI Yuji
摘要： Warpage or torsion in a longitudinal direction is suppressed when an elongated curved component is manufactured by press forming. A method for manufacturing a pressed component includes a first step (2) of press forming a metal sheet (1) in a desired component shape using a first die, and a second step (3) of press forming a formed product (10) using a second die after the first step (2). In the second step (3), a cross section of a bent part (10D) and a vertical wall part (10B) are controlled to be opened depending on warpage at longitudinal end portions of the component by elastic recovery due to release from the first die, thereby suppressing the warpage.
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7.发明公开
公开(公告)号：EP3760331A1
公开(公告)日：2021-01-06
申请号：EP19760333.5
申请日：2019-02-21
发明人： MIYAKE Hiroto , SHINMIYA Toyohisa , YAMASAKI Yuji
摘要： In a press-formed component including a shape curved in such a manner as to protrude toward a top sheet portion along a longitudinal direction, forming defects such as cracks, wrinkles, and lowered dimensional accuracy are reduced. The present invention includes a first forming step (9A) of press forming a metal sheet (10) into an intermediate formed product (30) bent out of a plane at a bending position set at a center portion in the longitudinal direction of a region to be a curved portion (1A) as seen in a side view and including a projection portion (30A) in regions to be a top sheet portion (2) and a vertical wall portion (3) and a second forming step (9B) of forming into a desired press-formed component shape (1). In a region to be a flange portion, an angle to be bent out of the plane is equal to or less than an angle formed by the flange portion (4) at the curved portion (1A) in the press-formed component shape (1). The projection portion (30A) has a largest projection height at the center portion in the longitudinal direction of the region to be the curved portion (1A) as seen in the side view, and a longitudinal length of a region to be the top sheet portion (2) is set to coincide with or approach a longitudinal length of the top sheet portion (2) in the press-formed component shape (1).
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8.发明公开
公开(公告)号：EP3760330A1
公开(公告)日：2021-01-06
申请号：EP19761706.1
申请日：2019-02-21
发明人： MIYAKE Hiroto , SHINMIYA Toyohisa , YAMASAKI Yuji
摘要： There is provided a technology capable of further reducing forming defects such as cracks, wrinkles, and lowered dimensional accuracy in a press-formed component having a hat-shaped cross-sectional shape and including one or more curved portions as seen in a plan view. A metal sheet (10) for press forming has a shape such that, in a developed shape of a press-formed component shape (1) developed on a plane in such a manner that, in a region corresponding to a curved portion (1A), a line length of a position corresponding to a ridge line between a top sheet portion (2) and a vertical wall portion (3) in the press-formed component shape (1) is equal to a line length of the ridge line, a boundary position between the region corresponding to the curved portion (1A) and an other region in the region corresponding to the curved portion (1A)is rotationally displaced in-plane around a rotational center (P) set at a position on a curved recessed side rather than a position corresponding to a ridge line between the top sheet portion (2) and the vertical wall portion (3) on the curved recessed side, in a direction in which a line length of an outer edge of a position to be formed into the flange portion (4) on the curved protruding side in the region corresponding to the curved portion (1A) approaches a line length of an outer edge of the flange portion (4) on the curved protruding side in the press-formed component shape.
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公开(公告)号：EP3939713A1
公开(公告)日：2022-01-19
申请号：EP20770837.1
申请日：2020-03-13
发明人： FUJII Kento , SHINMIYA Toyohisa , YAMASAKI Yuji
摘要： Provided is a technology for more easily evaluating stretch flange cracking at a sheared end face of an evaluation metal sheet. A method includes reference strain gradient information (10c) acquired by performing a forming analysis of a hole expansion test on a randomly selected second metal sheet under predetermined forming conditions and converting a hole expansion ratio to a strain at a hole edge composed of true strain, the information (10c) being a relationship between the strain at the hole edge and a strain gradient along a radial direction, and two or more pieces of the information (10c) being included by changing the forming conditions. Hole expansion forming is performed on the evaluation metal sheet under the same forming conditions as respective forming conditions corresponding to at least two pieces of the reference strain gradient information (10c) to obtain at least two limit hole expansion ratios at a hole expansion limit of the evaluation metal sheet. A formable region (ARA) of the evaluation metal sheet is obtained from the at least two pieces of the reference strain gradient information (10c) and the obtained at least two limit hole expansion ratios at the hole expansion limit. Stretch flange cracking at the sheared end face of the evaluation metal sheet is evaluated by the obtained formable region (ARA).
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公开(公告)号：EP3909697A1
公开(公告)日：2021-11-17
申请号：EP19909134.9
申请日：2019-12-09
摘要： Proposed is a method for manufacturing a press-formed product, which is used in manufacturing a press-formed product with a bulging portion from a sheet-shaped material including a blanking step of blanking from the sheet-shaped material into a shape in which an excess material portion is added to the contour outline of a developed shape of the press-formed product, a first pressing step of folding the excess material portion to form straight sides into an intermediate formed product with a bent flange portion, a second pressing step of performing press forming including bulging in which the bulging portion is provided on the intermediate formed product, and a trimming step of trimming the excess material portion. Provided also are a blank material that includes excess material portion to be folded to form straight sides circumscribed around or spaced apart from a contour outline of a developed shape of the press-formed product, and an intermediate formed product that includes excess material portion including a bent flange portion folded to form straight sides.
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