公开(公告)号：US10169496B2

公开(公告)日：2019-01-01

申请号：US14418869

申请日：2013-09-27

Applicant: JFE STEEL CORPORATION

Inventor： Hirotaka Kano ,  Osamu Sonobe

IPC: G06F17/50 ,  B21D22/00 ,  B21J5/00 ,  B21K7/12 ,  G06F17/11

Abstract: A springback amount evaluation method evaluates an amount of springback after die release of a press forming product by a computer and includes: setting a plurality of section planes intersecting a shape of the press forming product at predetermined intervals; obtaining a sectional shape of the press forming product for each of the set section planes; and obtaining an orientation of each of the sectional shapes in each section plane as a direction of the each of the sectional shapes, wherein for each of a shape to be a reference of the press forming product and a shape after the die release, the above-described three steps are performed, and the amount of springback is evaluated by comparing, for all of the section planes, the obtained directions of the sectional shapes for the shape to be the reference and for the shape after the die release.

公开(公告)号：US09953115B2

公开(公告)日：2018-04-24

申请号：US14436236

申请日：2013-10-10

Applicant: JFE STEEL CORPORATION

Inventor： Osamu Sonobe ,  Akinobu Ishiwatari ,  Masaki Urabe ,  Hirotaka Kano ,  Jiro Hiramoto

IPC: G06F17/50 ,  G06F17/10 ,  G01L5/00 ,  B21D22/02 ,  G01N3/28 ,  G01M99/00 ,  B21D19/00 ,  B21D53/88

CPC classification number: G06F17/5009 ,  B21D19/00 ,  B21D22/02 ,  B21D53/88 ,  G01L5/00 ,  G01M99/007 ,  G01N3/28 ,  G01N2203/0075 ,  G01N2203/0254 ,  G01N2203/027 ,  G06F17/10

Abstract: A method for manufacturing a press formed part, the method including specifying stretch flange limit strain in a metal sheet by using strain gradient in a radial direction and strain gradient in a sheet thickness direction. The strain gradient in the radial direction being directed from an end portion of the metal sheet at a time a press load is applied. The strain gradient in the sheet thickness direction being a direction of the metal sheet that intersects a loading direction. Additionally, the stretch flange limit strain satisfies the formula ϵθlim=A[a·Δϵθ/Δr+b·Δϵθ/Δt]+c, where ϵθlim represents the stretch flange limit strain in a tangential direction of the sheet edge, Δϵθ/Δr represents the strain gradient in the radial direction, Δϵθ/Δt represents the strain gradient in the sheet thickness direction, A, a, and b represent influence coefficients, and c represents the limit strain at a time the strain gradient is zero.

公开(公告)号：US20150205892A1

公开(公告)日：2015-07-23

申请号：US14418869

申请日：2013-09-27

Applicant: JFE STEEL CORPORATION

Inventor： Hirotaka Kano ,  Osamu Sonobe

IPC: G06F17/50 ,  B21J5/00 ,  G06F17/11 ,  B21K7/12

CPC classification number: G06F17/5009 ,  B21D22/00 ,  B21J5/00 ,  B21K7/12 ,  G06F17/11 ,  G06F2217/16 ,  G06F2217/41

Abstract: A springback amount evaluation method evaluates an amount of springback after die release of a press forming product by a computer and includes: setting a plurality of section planes intersecting a shape of the press forming product at predetermined intervals; obtaining a sectional shape of the press forming product for each of the set section planes; and obtaining an orientation of each of the sectional shapes in each section plane as a direction of the each of the sectional shapes, wherein for each of a shape to be a reference of the press forming product and a shape after the die release, the above-described three steps are performed, and the amount of springback is evaluated by comparing, for all of the section planes, the obtained directions of the sectional shapes for the shape to be the reference and for the shape after the die release.

Abstract translation: 回弹量评价方法通过计算机评价冲压成型品脱模后的回弹量，包括：以规定间隔设置与冲压成形品的形状相交的多个截面; 获得每个设定部分平面的冲压成形产品的截面形状; 并且获得每个截面形状中的每个截面形状的取向作为每个截面形状的方向，其中对于作为冲压成形产品的基准的形状和脱模后的形状，上述 描述了三个步骤，并且通过比较所有截面，获得作为参考的形状和模具脱模后形状的截面形状的方向来评估回弹量。