锻压技术

5083铝合金板在不同温度下的伸长率及拉胀成形极限

英文标题：Elongation and bulging limit of 5083 aluminum alloy sheet under different temperatures

作者：吕琳姚云欢周杰陈康邓明

单位：重庆理工大学

分类号：TG146.2+1

出版年,卷(期):页码：2019,44(4):151-156

摘要：

通过在不同变形温度和变形速率下进行单向拉伸实验，得到5083铝合金板材的伸长率变化规律，变形速率为1 mm·min-1、变形温度为350 ℃时,伸长率达到最大值131％。运用Dynaform模拟5083铝合金板材在不同温度下的温成形实验，并利用自行设计的温成形实验装置进行实验验证，得到了不同温度下数值模拟和物理实验的成形极限图，对比发现：随着温度的增加，铝合金板的胀形极限增加，在300 ℃时材料的成形极限最高。最后，模拟了5083铝合金板材在不同温度下的温拉深破裂实验，并利用铝合金板温成形实验装置进行实验验证，得到了不同温度下的板料拉深极限直径，计算出不同温度下的极限拉深系数。研究表明，极限拉深系数随着温度的增加呈高-低-高的变化规律，5083铝合金板的温成形最佳温度为250 ℃。

The elongation changing rule of 5083 aluminum alloy sheet was obtained by uniaxial tensile experiment at different deformation temperatures and deformation rates，and the maximum elongation is 131% at the deformation rate of 1 mm·min-1 and the deformation temperature of 350 ℃. Then, the warm forming experiments of 5083 aluminum alloy sheet at different temperatures were simulated by software Dynaform, and the experimental verification was conducted by the self-designed warm forming device. Furthermore, the forming limit diagrams（FLD） of numerical simulation and physical experiment were obtained at different temperatures. By contrast, it is found that the bulging limit of 5083 aluminum alloy sheet increases with the increasing of temperature, and the forming limit of material is highest at 300 ℃. Finally, the warm deep drawing rupture experiments of 5083 aluminum alloy sheet at different temperatures were simulated, and the experimental verification was conducted by the warm forming device of aluminum alloy sheet to obtain the limit drawing diameter of sheet at different temperatures. Furthermore, the limit drawing coefficient at different temperatures were calculated. The results show that the limit drawing coefficient shows a high-low-high changing rule with the increasing of temperature, and the optimum temperature of warm forming for 5083 aluminum alloy sheet is 250 ℃.

基金项目：

国家自然科学基金资助项目（51375521）

吕琳（1968-），女，硕士，教授 E-mail：lulin@cqut.edu.cn 通讯作者：邓明（1960-），男，硕士，教授 E-mail：dm@cqut.edu.cn

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