Title:
DEFORMATION LIMIT EVALUATION METHOD FOR SHEARED SURFACE OF METALLIC SHEET, CRACK PREDICTION METHOD, AND PRESS DIE DESIGNING METHOD
Document Type and Number:
WIPO Patent Application WO/2019/039134
Kind Code:
A1
Abstract:
Provided is a technique to be reflected in a press die designing method by providing an evaluation method and a prediction method for cracks which are caused by bending treatment of an end surface of a sheared base sheet. In this deformation limit evaluation method, the deformation limit, on a sheared surface (10A), of a sheared metallic sheet (1) is evaluated in press molding of the metallic sheet (1). The deformation limit on the sheared surface (10A) is evaluated or a crack of the sheared surface (10A) is predicted, on the basis of the relationship between: an index value obtained from the gradients of two surface strain distributions among the distributions of strains generated near the boundary between a bending outside surface and the sheared surface (10A) of the metallic sheet (1) to be bent, the gradients of the two surface strain distributions including the gradient of a distribution, of surface strains, in the sheet thickness direction X in the evaluation position of the sheared surface (10A) and the gradient of the distribution, of surface strains, in the bending ridge direction Y of bending in a direction away from the sheared surface (10A); and a tension generated in the sheared surface.
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Inventors:
FUJII YUSUKE (JP)
FUJII KENTO (JP)
YAMASAKI YUJI (JP)
FUJII KENTO (JP)
YAMASAKI YUJI (JP)
Application Number:
PCT/JP2018/026587
Publication Date:
February 28, 2019
Filing Date:
July 13, 2018
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
B21D5/00; G06F17/50
Foreign References:
| JP2014115269A | 2014-06-26 | |||
| JP2011043452A | 2011-03-03 | |||
| JP2014016807A | 2014-01-30 | |||
| JPS5630312B2 | 1981-07-14 | |||
| JPS5146395B2 | 1976-12-08 | |||
| JP2017160055A | 2017-09-14 |
Other References:
KOICHI KAZAMA AND YASUTOMO NAGAI, ANALYSIS OF CAMBER DEFORMATION OCCURRING AT THE EDGE OF SHEET-METAL BENDING, vol. 45, no. 516, 2004, pages 40 - 44
See also references of EP 3674009A4
See also references of EP 3674009A4
Attorney, Agent or Firm:
TANAKA Hidetetsu et al. (JP)
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