Title:
METHOD FOR EVALUATING DEFORMATION LIMIT, CRACK PREDICTION METHOD, AND METHOD FOR DESIGNING PRESS DIE
Document Type and Number:
WIPO Patent Application WO/2019/064922
Kind Code:
A1
Abstract:
In order to prevent cracking of a sheared end face due to press forming, the present invention provides a technique for evaluating and predicting the crack limit of a sheared end face of a metal sheet and determining press forming conditions. This method is a deformation limit evaluation method for evaluating the deformation limit at a sheared end face of a metal sheet (1) when deforming the sheared metal sheet (1) by press forming, wherein: the deformation limit is evaluated by means of an index value obtained from two stress gradients, that is, a stress gradient in the sheet thickness direction and a stress gradient in a direction going away from the sheared end face, at an evaluation position in a stress distribution generated in the vicinity of the sheared end face of the metal sheet (1) due to the press forming.
Inventors:
FUJII KENTO (JP)
FUJII YUSUKE (JP)
YAMASAKI YUJI (JP)
FUJII YUSUKE (JP)
YAMASAKI YUJI (JP)
Application Number:
PCT/JP2018/029131
Publication Date:
April 04, 2019
Filing Date:
August 02, 2018
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
B21D37/20; B21D5/01; B21D22/00; G01N3/28; G06F17/50
Domestic Patent References:
| WO2014077060A1 | 2014-05-22 | |||
| WO2014208697A1 | 2014-12-31 |
Foreign References:
| JP2012166251A | 2012-09-06 | |||
| JP2006155254A | 2006-06-15 | |||
| JP2011043452A | 2011-03-03 | |||
| JP2010069533A | 2010-04-02 | |||
| JP2011140046A | 2011-07-21 | |||
| JP2014115269A | 2014-06-26 | |||
| JP2017184706A | 2017-10-12 |
Other References:
See also references of EP 3689491A4
Attorney, Agent or Firm:
TANAKA Hidetetsu et al. (JP)
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