汽车用5754铝合金温拉深成形性能的研究

Forming properties of 5754 aluminum alloy for automotive body sheet during warm deep drawing processes

通过筒形件拉深试验,研究了压边力、变形速率及变形温度等因素,对5754铝合金板材拉深成形过程的影响规律,并通过扫描电子显微镜(SEM)观察分析了不同条件下筒形件拉裂断口形貌.研究结果表明:在压边力为1.0N/mm2时,筒形件成形质量较高;在以低于0.5mm/s的速率拉深时,5754铝合金板的成形性能比高速拉深时的成形性能好;当变形温度低于523K时,5754铝合金板的极限拉深比随温度的升高而增大,在523K时达到最大极限,拉深比为2.30,之后随着温度的继续升高,拉深比反而降低;从断口形貌上看,随着温度的升高,板材塑性成形性能逐渐改善.

By cylindrical workpieces drawing test, the paper had researched the influence of blank holder force,strain rate and temperature on 5754 aluminum alloy, and analyzed the fracture morphology of cylinder under different conditions by SEM. It is found that under the blank holder force is 1.0 N/mm^2 , aluminum alloy could gain optimum drawing performance. The forming properties of 5754 aluminum alloy sheet are better when the drawing speed is lower than 0. 5 mm/s. LDR increases while the forming temperature increases before it gets to the maximum value 2.30 at 523K,and LDR value decreases after that. By analyzed the fracture morphology, it is found that the forming properties of the sheet can be improved gradually with the temperature increasing.