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公开(公告)号：EP4454777A1
公开(公告)日：2024-10-30
申请号：EP22926050.0
申请日：2022-11-10
发明人： TOBITA, Shunsuke
摘要： A press forming method and a press formed part manufacturing method according to the present invention correspond to a method of forming a press formed part 1, the press formed part 1 including: a top portion 3 having a convex peripheral edge 3a having a whole of or part of an outer peripheral edge curved outward in a convex shape; a side wall portion 5 continuous to the top portion 3 via a punch shoulder R portion 23; and a flange portion 7 continuous to the side wall portion 5 via a die shoulder R portion 25. The method includes: a first forming step of forming a metal sheet into a preformed part 17; a second forming step of forming the preformed part 17 formed in the first forming step into the press formed part 1 having a target shape. The first forming step performs forming such that a bending radius of the die shoulder R portion 25 formed corresponding to at least the convex peripheral edge 3a of the top portion 3 of the preformed part 17 is larger than a bending radius of the die shoulder R portion 25 of the press formed part 1 having the target shape.
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公开(公告)号：EP4112201A1
公开(公告)日：2023-01-04
申请号：EP20921529.2
申请日：2020-10-02
发明人： FUJII, Yusuke , URABE, Masaki , TOBITA, Shunsuke
摘要： A press forming method according to the present invention is to control a shape change of a press formed part 1 over time after a release from a press-forming die and springback, and includes: a press forming step S1 of press forming a metal sheet into the press formed part 1 by using the press-forming die; a die releasing step S3 of releasing the press formed part 1, which is press-formed, from the press-forming die; and a post-release die holding step S5 of holding the released press formed part 1 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：EP4245435A1
公开(公告)日：2023-09-20
申请号：EP21906049.8
申请日：2021-08-06
发明人： FUJII, Yusuke , URABE, Masaki , TOBITA, Shunsuke
IPC分类号： B21D22/00
摘要： A shape change prediction method of a press formed part according to the present invention predicts a shape change, in which an end side in a longitudinal direction is twisted due to stress relaxation with the lapse of time after die release from a tool of press forming and springback, with respect to a press formed part 1 having a U-shaped cross-sectional shape including a top portion 3 and a pair of side wall portions 5 and having a shape curved in the longitudinal direction in a top view, the method including: a step of acquiring a shape and a residual stress of the press formed part 1 immediately after the springback (S1); a step of setting a value of stress relaxed and reduced compared to the residual stress immediately after the springback for at least one of the pair of side wall portions 5 of the press formed part 1 immediately after the springback (S3); and a step of acquiring a shape with which moment of force is balanced with respect to the press formed part 1 in which the value of the relaxed and reduced stress is set (S5).
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公开(公告)号：EP3064288B1
公开(公告)日：2018-06-06
申请号：EP14858848.6
申请日：2014-08-11
摘要： A method of sheet forming according to the present invention includes a first sheet forming process that sheet-forms a metal sheet 11 into a first sheet-formed part 27 having an intermediate shape with a first sheet forming tool 1 and a second sheet forming process that sheet-forms the first sheet-formed part 27 into a second sheet-formed part having a product shape. The first sheet-formed part 27 has a side-wall stretching portion 29 formed on a side wall portion 23 on an outer side including an L-shaped bent portion and a top-portion stretching portion 31 formed on the outside of a top portion 21 of the L-shaped bent portion. A curvature radius of the side-wall stretching portion 29 is larger than the curvature radius of the L-shaped bent portion of a sheet-formed part 19, and the curvature radius of a shoulder portion contiguously formed with the top-portion stretching portion 31 is larger than the curvature radius of a shoulder portion contiguously formed with the outside of the top portion 21 of the L-shaped bent portion of the sheet-formed part 19.
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公开(公告)号：EP4104946A1
公开(公告)日：2022-12-21
申请号：EP20919234.3
申请日：2020-10-02
发明人： FUJII, Yusuke , URABE, Masaki , TOBITA, Shunsuke
IPC分类号： B21D22/00
摘要： A shape change prediction method for a press formed part according to the present invention predicts a shape change due to stress relaxation over time after a press formed part 1 having a punch shoulder 9 and/or a die shoulder 11 is released from a press-forming die and springs back, and includes a step of acquiring a shape and a residual stress of the press formed part 1 immediately after the springback by a springback analysis of the press formed part 1 (Sl), a step of setting a value of residual stress, which is acquired by relaxation and reduction of a residual stress of the punch shoulder 9 and/or the die shoulder 11 of the press formed part 1 immediately after the springback, with respect thereto (S3), and a step of determining a shape in which moments of force are balanced with respect to the press formed part 1 in which the value of the residual stress in the punch shoulder 9 and/or the die shoulder 11 is relaxed, reduced, and set (S5).
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公开(公告)号：EP3733320A1
公开(公告)日：2020-11-04
申请号：EP18897134.5
申请日：2018-12-17
摘要： To provide a press formed product in which a stretch flange crack can be suppressed and which is free from forming defects without complicating the die shape and without applying heat treatment more than necessary. A method for manufacturing the press formed product is a method for manufacturing the press formed product including applying press processing (press processing process (4)) including stretch flange forming to a single metal sheet of one sheet material after performing shearing processing (shearing process (1)) of the metal sheet to manufacture the press formed product. When a region where a stretch flange crack is estimated to be likely to occur when the single metal sheet is press formed by the press processing is set as a stretch flange crack region, the press processing (press processing process (4)) is applied after heating and cooling the end surface of the metal sheet positioned in the stretch flange crack region and at least the end surface in the end surface and the vicinity thereof in the single metal sheet after the shearing processing (heating process (2) and cooling process 3 (3)).
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公开(公告)号：EP4104945A1
公开(公告)日：2022-12-21
申请号：EP20918437.3
申请日：2020-10-02
发明人： FUJII, Yusuke , URABE, Masaki , TOBITA, Shunsuke
摘要： A shape change prediction method for a press formed part according to the present invention predicts a shape change of a press formed part 1, which is released from a die and springs back, with the lapse of time units, and includes: a shape/residual stress immediately after springback acquisition step S1 of acquiring a shape and a residual stress of the press formed part 1 immediately after the springback by a springback analysis of the press formed part 1; a residual stress relaxation/reduction setting step S3 of setting a value of a residual stress relaxed and reduced from the acquired residual stress to the press formed part 1 immediately after the springback; and a shape analysis step S5 of determining a shape, in which moments of force are balanced, for the press formed part 1 to which the value of the relaxed and reduced residual stress is set.
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公开(公告)号：EP3064288A1
公开(公告)日：2016-09-07
申请号：EP14858848.6
申请日：2014-08-11
IPC分类号： B21D22/26
摘要： A method of sheet forming according to the present invention includes a first sheet forming process that sheet-forms a metal sheet 11 into a first sheet-formed part 27 having an intermediate shape with a first sheet forming tool 1 and a second sheet forming process that sheet-forms the first sheet-formed part 27 into a second sheet-formed part having a product shape. The first sheet-formed part 27 has a side-wall stretching portion 29 formed on a side wall portion 23 on an outer side including an L-shaped bent portion and a top-portion stretching portion 31 formed on the outside of a top portion 21 of the L-shaped bent portion. A curvature radius of the side-wall stretching portion 29 is larger than the curvature radius of the L-shaped bent portion of a sheet-formed part 19, and the curvature radius of a shoulder portion contiguously formed with the top-portion stretching portion 31 is larger than the curvature radius of a shoulder portion contiguously formed with the outside of the top portion 21 of the L-shaped bent portion of the sheet-formed part 19.
摘要翻译： 根据本发明的片材成形方法包括：第一片材形成工艺，其将具有中间形状的金属片11成形为具有第一片形成工具1的中间形状的第一片状部件27和第二片材形成工序， 将第一片状部件27片材形成为具有产品形状的第二片状部件。 第一片状部分27具有形成在包括L形弯曲部分的外侧上的侧壁部分23上的侧壁拉伸部分29和形成在顶部21的外侧上的顶部拉伸部分31 的L形弯曲部分。 侧壁拉伸部29的曲率半径大于片状部19的L字形弯曲部的曲率半径，与顶部拉伸部31相邻形成的肩部的曲率半径 大于与片状部件19的L形弯曲部的顶部21的外侧连续形成的肩部的曲率半径。
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