| 摘要 |
PROBLEM TO BE SOLVED: To achieve both of securement of high formability of an Al-Mg-Si-based aluminum alloy sheet mainly used as an automotive body sheet and keeping of high productivity in the forming. SOLUTION: Regarding the Al-Mg-Si-based aluminum alloy sheet lying in a sub-aged state by age hardening or in a worked and hardened state by rolling, before cold press forming therefor, solution heat treatment is partially performed, a strength difference is imparted to a heated part and a non-heated part, and the heated part having low strength is made to abut on the pressure pad part, and the non-heated part having high strength is made to abut on a punch shoulder part, thus cold press forming is performed. In the partial solution heat treatment, rapid cooling is performed at≥50°C/min in such a manner that the heating arrival temperature of the heated part is controlled to 480 to <580°C. COPYRIGHT: (C)2010,JPO&INPIT |
