Title:
SHAPE CHANGE PREDICTION METHOD FOR PRESS-MOLDED ARTICLE
Document Type and Number:
WIPO Patent Application WO/2022/030057
Kind Code:
A1
Abstract:
This shape change prediction method for a press-molded article predicts shape change caused by stress alleviation over time after release from a mold and spring-back, for a press-molded article that has a top plate, a punch shoulder section, and a vertical wall and has a shape whereby, in a side surface view, the top plate side has bent in a recessed shape. The shape change prediction method includes: a step (S1) for acquiring the residual stress and the shape of the press-molded article immediately after the spring-back, by using spring-back analysis; a step (S3) for setting a residual stress that is alleviated and reduced more than the residual stress immediately after spring-back, for at least the punch shoulder section and/or the vertical wall in the press-molded article immediately after spring-back; and a step (S5) for determining a shape which achieves balance of the moment of force for the press-molded article that has an alleviated and reduced value of residual stress set therefor.
Inventors:
AGEBA RYO (JP)
FUJII YUSUKE (JP)
URABE MASAKI (JP)
TOBITA SHUNSUKE (JP)
FUJII YUSUKE (JP)
URABE MASAKI (JP)
TOBITA SHUNSUKE (JP)
Application Number:
PCT/JP2021/017369
Publication Date:
February 10, 2022
Filing Date:
May 06, 2021
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
B21D22/00; B21D22/20
Domestic Patent References:
| WO2020126380A1 | 2020-06-25 |
Foreign References:
| JP2014065056A | 2014-04-17 | |||
| JP2013198927A | 2013-10-03 | |||
| JP2013208622A | 2013-10-10 |
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)
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