|Budget Amount *help
¥18,330,000 (Direct Cost: ¥14,100,000、Indirect Cost: ¥4,230,000)
Fiscal Year 2015: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2014: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2013: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2012: ¥5,850,000 (Direct Cost: ¥4,500,000、Indirect Cost: ¥1,350,000)
|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.