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Patent Searching and Data


Title:
BENDING ANGLE PREDICTION METHOD, BENDING ANGLE PREDICTION DEVICE, PROGRAM, AND RECORDING MEDIUM
Document Type and Number:
WIPO Patent Application WO/2020/204060
Kind Code:
A1
Abstract:
This bending angle prediction method includes: a first step for acquiring, on the basis of the material characteristics of a steel material, the bending angle of which is to be predicted, the maximum main strain of an outermost bending surface of the steel material; and a second step for calculating a limit VDA bending angle of the steel material by inputting the sheet thickness of the steel material and the maximum main strain of the outermost bending surface of the steel material acquired in the first step to a relational expression that is predetermined by using a finite element method and that defines the limit VDA bending angle through a function of the sheet thickness and the maximum main strain of the outermost bending surface. As a result, with respect to a steel material having intended material characteristics, a limit VDA bending angle in any sheet thickness after deformation can be easily and accurately acquired, for example, when sheet thickness has changed as a result of preliminary deformation performed in a previous step.

Inventors:
AITOH TAKAHIRO (JP)
YONEMURA SHIGERU (JP)
Application Number:
PCT/JP2020/014990
Publication Date:
October 08, 2020
Filing Date:
April 01, 2020
Export Citation:
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Assignee:
NIPPON STEEL CORP (JP)
International Classes:
B21D5/01; B21D22/00; G01N3/20; G06F30/10; G06F30/23
Foreign References:
JP2003320421A2003-11-11
Other References:
CHEONG K, OMER K, BUTCHER C, GEORGE R, DYKEMAN J: "Evaluation of the VDA 238-100 Tight Radius Bending Test using Digital Image Correlation Strain Measurement", JOURNAL OF PHYSICS: CONFERENCE SERIES, vol. 896, no. 012075, 1 September 2017 (2017-09-01), pages 1 - 8, XP055745997
Attorney, Agent or Firm:
KOKUBUN, Takayoshi (JP)
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