锻压技术

基于热拉深技术的车用轻量化高强7075铝板拉深性能研究

英文标题：Research on high strength aluminum 7075 sheet for lightweight automobile based on thermal deep drawing technology

作者：崔华丽吴媛媛

分类号：TG356

出版年,卷(期):页码：2018,43(5):0-0

摘要：

采用模内加热的方式，比较不同工艺条件下 1 mm 厚 7075铝合金板料的拉深成形能力，研究高强7075铝板在热成形条件下的拉深性能。结果表明：随温度上升，高强7075铝板极限拉深的值持续增加，当温度达到450 ℃后，极限拉深比值开始逐渐降低，试样在300~400 ℃的拉深温度范围内可以获得最优的拉深极限；将热拉深速度设定在8.5 mm·s-1，成形过程可以达到 1.96的最大极限拉深比值；最佳的成形温度在300~400 ℃之间。筒壁区域晶粒受拉应力作用被明显拉长；圆角区域只有部分晶粒出现被拉长的现象。

The drawing abilities of aluminum 7075 sheet with thickness of 1 mm under different process conditions were compared by heating the internal die, and the drawing properties of high strength sheet under the condition of hot forming were studied. The results show that with the rising temperature, the drawing limit of high strength aluminum 7075 sheet continuously increases, and when temperature is up to 450 ℃, the limit drawing ratio gradually reduces. Therefore, optimal drawing limit of specimens is obtained at the temperature of 300400 ℃. Furthermore, the thermal deep drawing speed is set to 8.5 mm·s-1 in the forming process, and the maximum limit drawing ratio of 1.96 can be reached at the best forming temperature of 300400 ℃. Finally, the grain in the cylinder wall is significantly elongated by tensile stress, and only partial grains appear the phenomenon of elongation at the rounded area.

基金项目：

河南省高等学校重点科研项目计划(16A460030)

作者简介：崔华丽（1980-）,女，硕士，讲师 Email：mpydjg2@126.com

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