公开(公告)号：EP3689491A1

公开(公告)日：2020-08-05

申请号：EP18861608.0

申请日：2018-08-02

申请人： JFE Steel Corporation

发明人： FUJII Kento ,  FUJII Yusuke ,  YAMASAKI Yuji

IPC分类号： B21D37/20 ,  B21D5/01 ,  B21D22/00 ,  G01N3/28 ,  G06F17/50

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 (1) subjected to shearing, evaluating a deformation limit of the sheared end face of the metal sheet (1), 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 (1) due to the press forming, which gradients are a stress gradient in a sheet thickness direction X and a stress gradient in a direction away from the sheared end face.

公开(公告)号：EP2916122A1

公开(公告)日：2015-09-09

申请号：EP13851774.3

申请日：2013-10-30

申请人： JFE Steel Corporation

发明人： FUTATSUKA Takayuki ,  IWAMA Takashi ,  SATO Kentaro ,  YAMASAKI Yuji ,  KOMATU Youiti ,  SHIRAISHI Eiichi ,  YOSHITOMI Kazunari ,  HATA Yukiko ,  TOKIEDA Kayo

IPC分类号： G01N3/20

CPC分类号： G01N3/42 ,  G01M11/081 ,  G01N3/068 ,  G01N2203/0647

摘要： [Task] It is to provide a technique for measuring dynamic panel stiffness in a higher accuracy.
[Solution for task] A method for measuring dynamic panel stiffness of an outer panel for automobile parts by pushing an indenter onto a surface of an outer panel to be measured in a given pushing direction intersecting to the surface under a given load to deform the outer panel and measuring a deformation state of the outer panel, characterized in that grids arranged in a regular lattice form are transferred to a surface of a measuring site of the outer panel to be measured; fiducial markers previously knowing three-dimensional position information are arranged on the periphery of the measuring site of the outer panel; the indenter is pushed onto the surface of the measuring site of the outer panel under the load and moved in a direction perpendicular to the pushing direction, during which the grids on the surface of the outer panel deformed by loading of the indenter are simultaneously and repeatedly shot from plural positions by means of plural cameras; three-dimensional position information of the grids is calculated corresponding to the fiducial markers based on the shot image data to measure a change in the deformation state of the outer panel associated with the movement of the indenter, which is output as panel deformation data.

摘要翻译： [任务]它是用于在较高的精度测量动态刚度面板提供的技术。 [对任务的解决方案]一种用于通过对压头推到外板的表面测量汽车部件的外板的动态面板刚度法在给定的推入方向的给定负荷下相交于表面变形的外来测量 面板以及测量所述外板，在网格为特征的变形状态也以规则的格子状布置被转移到外面板的测定部位的表面进行测量; 基准标记以前知道的三维位置信息被设置在所述外板的被测定部位的外周; 压头被压入载荷下外板的被测定部位的表面，并在一个方向上移动垂直于推压方向，这期间由压头的载荷而变形的外板的表面上的网格是同时并反复 通过的多个摄像机手段的多个位置拍摄; 网格的三维位置信息，计算对应于基于所述拍摄图像数据来测量与所述压头的运动相关联的所述外部面板的变形状态的改变的基准标记，所有这些是作为面板变形数据输出。