Optimum press-die design for springback compensation by material-mechanical meta-model building

2015 Fiscal Year Final Research Report

• Project/Area Number: 24360056
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Production engineering/Processing studies
• Research Institution: Hiroshima University
• Principal Investigator: Yoshida Fusahito 広島大学, 工学(系)研究科(研究院), 教授 (50016797)
• Co-Investigator(Kenkyū-buntansha): HINO RYUTARO 広島大学, 大学院工学研究院, 准教授 (10283160) ; HAMASAKI HIROSHI 広島大学, 大学院工学研究院, 助教 (30437579) ; UEMORI TAKESHI 岡山大学, 自然科学研究科, 准教授 (70335701)
• Project Period (FY): 2012-04-01 – 2016-03-31
• Keywords: 板材成形 / プレス金型 / スプリングバック / 最適プロセス

Outline of Final Research Achievements

Nowadays, high strength steel sheets and aluminum sheets are increasingly used in automotive industry for the weight reduction and crush-safety worth of car structures. Springback control and compensation is a key technology in press forming of these sheet metals. In the present work, a new technology of springback elimination, by applying an additional bending by a counter-punch, was presented for U- and Hat-shaped sheet products. For this process, optimum die-shapes and process parameters (sheet-clamping, bottoming, and counter-punch loads) were determined. Furthermore, for accurate numerical simulation of sheet metal forming and springback, an anisotropic hardening model of plasticity to describe the anisotropy evolution together with the Bauschinger effect was proposed.

Free Research Field

Engineering elasto-plasticity