Title:
SHAPE CHANGE PREDICTION METHOD OF PRESS-FORMED PRODUCT
Document Type and Number:
Japanese Patent JP2022025865
Kind Code:
A
Abstract:
To provide a shape change prediction method of a press-formed product, predicting a shape change with the lapse of time of a press-formed product curved in plan view.SOLUTION: A shape change prediction method of a press-formed product is for predicting a shape change due to stress relaxation with the lapse of time after springback at the moment of release from a metallic mold, with respect to a press-formed product 1 which has a top plate part 3 and a vertical wall part 7 continuous from the top plate part 3 via a punch shoulder R part 5, and a curved shape in plan view. The method includes steps of: (S1) a step of acquiring by springback analysis a shape and residual stress of the press-formed product 1 just after springback; (S3) a step of setting a value of stress more relaxed and reduced than the residual stress just after springback, with respect to the whole or partial part of the press-formed product 1 just after springback; and (S5) a step of obtaining a shape in which moments of force are balanced, with respect to the press-formed product 1 whose relaxed and reduced stress value is set.SELECTED DRAWING: Figure 1
Inventors:
MINOTE TORU
FUJII YUSUKE
URABE MASAKI
FUJII YUSUKE
URABE MASAKI
Application Number:
JP2020129006A
Publication Date:
February 10, 2022
Filing Date:
July 30, 2020
Export Citation:
Assignee:
JFE STEEL CORP
International Classes:
B21D22/00; B21D22/20
Domestic Patent References:
| JP6683269B1 | 2020-04-15 | |||
| JPH0679372A | 1994-03-22 |
Other References:
TAKAYUKI HAMA: "Time-Dependent Springback of Various Sheet Metals: An Experimental Study", MATERIALS TRANSACTIONS, vol. 61, no. 5, JPN6021038857, 25 April 2020 (2020-04-25), JP, pages 941 - 947, ISSN: 0004609144
Attorney, Agent or Firm:
Toshihiko Ishikawa