Analysis of bulging process of aluminum alloy by overlapping sheet metal and its formability  

铝合金覆层板胀形过程及成形性能（英文）

作　　者：高铁军[1] 刘洋[1] 陈鹏[1] 王忠金[2] 

机构地区：[1]沈阳航空航天大学航空航天工程学部,沈阳110136 [2]哈尔滨工业大学材料科学与工程学院,哈尔滨150001

出　　处：《Transactions of Nonferrous Metals Society of China》2015年第4期1050-1055,共6页中国有色金属学报（英文版）

基　　金：Project(51205260)supported by the National Natural Science Foundation of China;Project(L2012046)supported by the Liaoning Provincial Committee of Education,China

摘　　要：The influences of strength coefficient K, work hardening exponent n and thickness t of the overlapping sheet on bulging process are analyzed based on hardening material model. Also, bulging experiments are carried out by taking the aluminum alloy LF21 as formed sheet metal, and selecting overlapping sheet with different thicknesses and material properties, by which accuracy of the above analysis result is verified in the aspects of geometric shape, thickness distribution and limit bulging height. The results show that higher strength coefficient K, larger work hardening exponent n and proper thickness of the overlapping sheet are helpful to improve the formability and forming uniformity of formed sheet metal.基于幂硬化材料模型,分析覆板材料强度系数K、加工硬化指数n及厚度t对成形板材胀形性能的影响,并以铝合金LF21为研究对象,选择不同厚度及性能的覆板进行了粘性介质压力胀形实验,从覆板材料性能及厚度等方面对板材胀形试件几何形状、壁厚分布规律及极限胀形高度等方面验证了分析结果的准确性。研究结果表明:覆板成形时,选择强度系数K较高、加工硬化指数n值较大及适当厚度的覆板有助于板材成形性能的提高。

关 键 词：overlapping sheet aluminum alloy BULGING power hardening material FORMABILITY 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG306[金属学及工艺—金属材料]