低碳钢/铝合金双层管充液弯曲变形规律

Suxing Gongcheng Xuebao/Journal of Plasticity Engineering(2013)

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Abstract
为解决传统技术无法制造大径厚比、小弯曲半径铝合金薄壁弯管的难题,提出采用双层管充液弯曲新方法.运用数值模拟研究厚度比和内压对低碳钢/铝合金双层管充液弯曲过程中起皱行为和壁厚分布的影响.结果表明,随着厚度比的增加,起皱的现象得到缓解直至消除,内层弯管外侧减薄率逐渐减小,壁厚分布更为均匀;随着内压的增加,起皱现象逐渐延缓,内层管壁厚最大减薄率增加,因此增加厚度比和内压均有助于提高双层管弯曲成形的稳定性.通过实验成功研制出径厚比为63的铝合金薄壁弯管件,外侧最大减薄率为24%.
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Key words
hydroforming,double-layered tubes,bending
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