Title:
METHOD FOR PREDICTING CHANGE IN SHAPE OF PRESS-MOLDED ARTICLE
Document Type and Number:
WIPO Patent Application WO/2022/130683
Kind Code:
A1
Abstract:
The method for predicting a change in the shape of a press-molded article according to the present invention predicts a change in the shape of a press-molded article 1 having a U-shaped cross section comprising a top plate 3 and a pair of vertical walls 5 and including a curved shape along a lengthwise direction in a top surface view, said change in shape being a twisting at the ends in the lengthwise direction caused by alleviation of stress over time after springback which occurs after release from a mold. The method includes a step (S1) in which the shape and residual stress of the press-formed article immediately after the springback are acquired; a step (S3) in which a value for the stress which is more alleviated and reduced than that of the residual stress immediately after the springback is set for at least one of the pair of vertical walls 5 of the press-formed article 1 immediately after the springback; and a step (S5) in which a shape that balances moments of forces is determined for the press-formed article 1 for which the stress value that is alleviated and reduced has been set.
Inventors:
FUJII YUSUKE (JP)
URABE MASAKI (JP)
TOBITA SHUNSUKE (JP)
URABE MASAKI (JP)
TOBITA SHUNSUKE (JP)
Application Number:
PCT/JP2021/029313
Publication Date:
June 23, 2022
Filing Date:
August 06, 2021
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
B21D22/00
Domestic Patent References:
| WO2020126380A1 | 2020-06-25 |
Foreign References:
| JP2014065056A | 2014-04-17 | |||
| JP2020028888A | 2020-02-27 | |||
| JP2013198927A | 2013-10-03 | |||
| JP2013208622A | 2013-10-10 | |||
| JP2006315063A | 2006-11-24 | |||
| JP5795151B2 | 2015-10-14 | |||
| JP5866892B2 | 2016-02-24 | |||
| JP2013113144A | 2013-06-10 |
Other References:
HAMA TAKAYUKI, SUZUKI TOMOTAKA, NAKATSUJI YUYA, SAKAI TAKEYUKI, TAKUDA HIROHIKO: "Time-Dependent Springback of Various Sheet Metals: An Experimental Study", MATERIALS TRANSACTIONS, THE JAPAN INSTITUTE OF METALS AND MATERIALS, 1 May 2020 (2020-05-01), pages 941 - 947, XP055891273, Retrieved from the Internet [retrieved on 20220214], DOI: 10.2320/matertrans.MT-M2019283
Attorney, Agent or Firm:
SAKAI INTERNATIONAL PATENT OFFICE (JP)
Download PDF:
Previous Patent: AQUEOUS PRIMARY BATTERY
Next Patent: OPERATION DEVICE AND OPERATION INFERENCE METHOD
Next Patent: OPERATION DEVICE AND OPERATION INFERENCE METHOD