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公开(公告)号：US20230398593A1
公开(公告)日：2023-12-14
申请号：US18033704
申请日：2021-06-30
发明人： Yusuke FUJII , Masaki URABE
IPC分类号： B21D22/26
CPC分类号： B21D22/26
摘要： A press forming method of press forming a press forming part that includes a top portion, a side wall portion continuous from the top portion via a punch shoulder, and a flange portion continuous from the side wall portion via a die shoulder, the press forming part having a curved portion curved in a recessed manner in a top view, the press forming method includes: making a bending radius of the die shoulder in the curved portion increased from an end side toward a middle portion of the curve.
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公开(公告)号：US20230087377A1
公开(公告)日：2023-03-23
申请号：US17798771
申请日：2020-10-02
发明人： Yusuke FUJII , Masaki URABE , Shunsuke TOBITA
摘要： A shape change prediction method for a press formed part for predicting a shape change of the press formed part with a lapse of time units after springback at a moment of a release from a die includes: a shape/residual stress immediately after springback acquisition step of 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; a residual stress relaxation/reduction setting step of setting a value of a residual stress relaxed and reduced from the acquired residual stress to the press formed part immediately after the springback; and a shape analysis step of determining a shape, in which moments of force are balanced, for the press formed part to which the value of the relaxed and reduced residual stress is set.
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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
发明人： Yusuke FUJII , Masaki URABE , Shunsuke TOBITA
摘要： 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
发明人： Yusuke FUJII , Masaki URABE , Shunsuke TOBITA
IPC分类号： B21D22/26
摘要： 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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15.发明申请公开(公告)号：US20200276658A1
公开(公告)日：2020-09-03
申请号：US16649866
申请日：2018-08-02
发明人： Kento FUJII , Yusuke FUJII , Yuji YAMASAKI
摘要： To prevent a crack from occurring on a sheared end face due to press forming, a technology is provided for evaluating and predicting a crack limit of the sheared end face of a metal sheet and determining press forming conditions. In a deformation limit evaluation method for, when deforming by press forming a metal sheet subjected to shearing, evaluating a deformation limit of the sheared end face of the metal sheet, the deformation limit is evaluated by an index value obtained from two stress gradients at an evaluation position among stress distributions occurring in the vicinity of the sheared end face of the metal sheet due to the press forming, which gradients are a stress gradient in a sheet thickness direction and a stress gradient in a direction away from the sheared end face.
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公开(公告)号：US20190048431A1
公开(公告)日：2019-02-14
申请号：US16079712
申请日：2017-02-15
发明人： Yusuke FUJII , Yoshie NAKAI , Naoki KIKUCHI , Naoya SHIBUTA , Shinichi NAGAI , Takahiko MAEDA , Yuji MIKI
摘要： A molten steel refining method includes throwing a powder to molten steel while heating the powder with a flame formed by combustion of a hydrocarbon gas at the leading end of a top blowing lance. The lance height of the top blowing lance (the distance between the static bath surface of the molten steel and the leading end of the lance) is controlled to 1.0 to 7.0 m, and the dynamic pressure P of a jet flow ejected from the top blowing lance calculated from equation (1) below is controlled to 20.0 kPa or more and 100.0 kPa or less. P=ρg× U2/2 . . . (1) wherein P is the dynamic pressure (kPa) of the jet flow at an exit of the top blowing lance, ρg the density (kg/Nm3) of the jet flow, and U the velocity (m/sec) of the jet flow at the exit of the top blowing lance.
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公开(公告)号：US20160158821A1
公开(公告)日：2016-06-09
申请号：US14906240
申请日：2014-07-18
IPC分类号： B21D22/02
摘要： There is provided a method of manufacturing a curved channel part having a curved portion in a vertical wall portion by press forming, the method restricting stretch flange deformation, which occurs in the vertical wall portion and a flange portion. The method includes a shear deformation step as a step of forming the vertical wall portion. In the shear deformation step, a boundary-side portion of a base section of a blank with respect to a deformation section, and an outer portion of the deformation section are individually restrained, a portion to be a vertical wall portion of the deformation section is shear-deformed in a sheet face, and a material is caused to flow from a portion separated from a curved portion toward the curved portion in an outer edge portion of the portion to be the vertical wall portion.
摘要翻译： 提供了一种制造弯曲通道部分的方法，该弯曲通道部分在垂直壁部分中通过冲压成形具有弯曲部分，该方法限制了在垂直壁部分和凸缘部分中发生的拉伸凸缘变形。 该方法包括作为形成垂直壁部的步骤的剪切变形步骤。 在剪切变形步骤中，相对于变形部分的坯料的基部的边界侧部分和变形部分的外部被单独地约束，变形部分的垂直壁部分的部分是 在片状面上产生剪切变形，并使材料从作为垂直壁部的部分的外缘部分的从弯曲部分向弯曲部分分离的部分流动。
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18.发明申请METHOD FOR MANUFACTURING METAL COMPONENT WITH THREE-DIMENSIONAL EDGE AND DIE SETS FOR MANUFACTURING THE SAME 审中-公开用于制造具有三维边缘的金属部件和用于制造其的金属部件的方法公开(公告)号：US20150360272A1
公开(公告)日：2015-12-17
申请号：US14762372
申请日：2014-01-20
IPC分类号： B21D22/02
摘要： A method and die set for manufacturing a metal component with a three-dimensional edge from a blank as a raw material. The blank is cut from a metal sheet and has a curve-shaped curved edge portion with two ends. The method includes providing a bend formation line and forming the three-dimensional shape using a first die and a second die.
摘要翻译： 一种用于制造具有来自坯料的三维边缘作为原料的金属部件的方法和模具。 坯料从金属片切割而成，具有两端曲线状的弯曲边缘部分。 该方法包括提供弯曲形成线并使用第一模具和第二模具形成三维形状。
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