公开(公告)号：EP3165298A4

公开(公告)日：2018-03-07

申请号：EP15815590

申请日：2015-07-02

申请人： NIPPON STEEL & SUMITOMO METAL CORP

发明人： SHIRAKAMI SATOSHI ,  YOSHIDA HIROSHI ,  MIYAGI TAKASHI ,  NITTA JUN ,  YOSHIDA TOHRU

IPC分类号： B21D22/00 ,  G06F17/50

CPC分类号： B21D22/00 ,  G06F17/5018 ,  G06F2217/42 ,  Y02T10/82

摘要： A stretch flange crack prediction method of predicting initiation of stretch flange cracks that occurs in a flange end section during stretch flange forming of a deformable sheet, includes: a measurement value acquisition process of acquiring, for each of a plurality of sheet-shaped test pieces, a fracture strain measurement value, a normal strain gradient measurement value, and a circumferential strain gradient measurement value; a CAE analysis process of acquiring a maximum major strain maximum element having a highest maximum major strain, a normal strain gradient of the maximum major strain maximum element, and a circumferential strain gradient of the maximum major strain maximum element; a fracture determination threshold acquisition process of acquiring a fracture determination threshold by converting the fracture strain measurement value; and a prediction process of predicting that stretch flange cracks will be initiated, when the maximum major strain is equal to or higher than the fracture determination threshold.

公开(公告)号：EP2860050A4

公开(公告)日：2016-01-27

申请号：EP13800578

申请日：2013-06-07

申请人： NIPPON STEEL & SUMITOMO METAL CORP

发明人： SHIRAKAMI SATOSHI ,  MIZUMURA MASAAKI ,  YOSHIDA TOHRU

IPC分类号： B60G7/00 ,  B21D19/00 ,  B21D22/02 ,  B21D41/02 ,  B21D53/84

CPC分类号： B60G7/001 ,  B21D22/025 ,  B21D41/026 ,  B21D53/84 ,  B60G2206/012 ,  B60G2206/11 ,  B60G2206/72 ,  B60G2206/8103 ,  B60G2206/8104 ,  B60G2206/811 ,  Y10T29/49622

摘要： A coupling structure includes a hollow rod section formed of a metal pipe and fastening sections formed by plastic deformation of the metal pipe so as to be connected with end sections of the hollow rod section. The fastening section includes a pair of base end sections which are each connected with a peripheral wall section forming a closed cross-section at the end section of the hollow rod section, and are separated from each other, and a bottom wall including a flat surface connected with the pair of the base end sections, and a pair of front end sections including a pair of side walls curving inwards from at least widthwise end sections of the bottom wall on a base end section side.

公开(公告)号：EP2682199A4

公开(公告)日：2014-11-19

申请号：EP12752145

申请日：2012-03-05

申请人： NIPPON STEEL & SUMITOMO METAL CORP

发明人： MIZUMURA MASAAKI ,  SATO KOICHI ,  SHIRAKAMI SATOSHI

IPC分类号： B21D22/20 ,  B21D5/02 ,  B21D5/08 ,  B21D24/00

CPC分类号： B21D5/02 ,  B21D5/008 ,  B21D35/005 ,  C21D1/09 ,  C21D1/30 ,  C21D1/32 ,  C21D7/10 ,  C21D7/13 ,  C21D2221/10 ,  Y10T29/49826

摘要： A method for bending a sheet metal comprises: a hardness adjustment process wherein a blank (10), including a high-hardness region (11) and a low-hardness region (12) having a lower hardness than the high hardness region (11), is formed by changing the hardness of at least a part of a sheet metal; and a bending process wherein a product (20) is formed by bending low-hardness region (12) of blank (10).

摘要翻译： 一种用于弯曲金属板的方法包括：硬度调节过程，其中包括具有比高硬度区域（11）更低的硬度的高硬度区域（11）和低硬度区域（12）的坯料（10） 通过改变金属板的至少一部分的硬度而形成; 以及弯曲过程，其中通过弯曲坯料（10）的低硬度区域（12）形成产品（20）。