5A06薄壁壳体超塑胀形过程壁厚分布规律及其控制  

Wall thickness distribution and its control of 5A06 thin-walled shell superplastic bulging

作　　者：李志强[1] 陆文林[1] 王伟亮[1] 王勇[1] 

机构地区：[1]北京机电研究所,北京100083

出　　处：《塑性工程学报》2017年第1期108-113,共6页Journal of Plasticity Engineering

基　　金：国家国际科技合作专项资助(2013DFR70860)

摘　　要：采用正反胀形法对薄壁壳体的壁厚分布进行了改善。首先通过数值模拟的方法,模拟了正胀形及两种不同反胀形模具气胀过程,进行了模具的设计制造;然后对正胀形及正反胀形进行了实验验证,并比较了两种不同反胀形形状对最终零件壁厚分布的影响,提出了用壁厚分布均方差判定壁厚均匀性的判据。研究表明,与正胀形相比,采用两种正反胀形法成形的零件的最小壁厚从0.69 mm增加到0.91 mm和0.89 mm,使零件的壁厚分布均方差从0.1236降低到0.0727和0.0642,证明了正反胀形法可以改善5A06铝合金壁厚分布均匀性。The wall thickness distribution of the thin-walled shell was improved by using positive and negative bulging method. Firstly,the bulging processes with positive bulging and two different negative bulging dies were simulated,and the design and manufacture of the dies were conducted; then the positive bulging and positive and negative bulging processes were verified by the experiments,and the effects of two different negative bulging shapes on the wall thickness distribution of final part were compared; finally,a criterion for determining the wall thickness uniformity of the mean square error was put forward. The results show that,compared with the positive bulging,the minimum wall thickness by using the positive and negative bulging increases from 0. 69 mm to 0. 91 mm and 0. 89 mm,respectively,and the mean square deviation of wall thickness distribution decreases from 0. 1236 to 0. 0727 and 0. 0642,respectively,which proves that the positive and negative bulging method can improve the uniformity of 5A06 aluminum＇s wall thickness distribution.

关 键 词：正反胀形 壁厚均匀性 超塑性气胀 均方差 

分 类 号：TG306[金属学及工艺—金属压力加工]