本文针对薄壁Y型三通管在内高压成形过程中产生起皱、开裂缺陷的问题进行了相关研究.首先通过实验确定了Y型三通管在成形过程中产生典型缺陷的位置及类型;其次利用有限元方法分析了补料比对应力状态分区和典型点应力轨迹的影响;最后建立了加载路径的"内压-轴向补料"成形窗口.研究表明:补料比对应力状态有显著影响,通过调整补料比来改变应力状态,是避免起皱的有效措施.此外,本研究给出了不同实验结果在成形窗口中的对应位置,当加载路径超出成形区时,三通管件就会产生起皱或破裂的缺陷,甚至两种缺陷会依次发生.%The wrinkling and bursting during thin?walled Y?shaped tube hydroforming process were studied. The location and type of typical defects were identified through experiments. The effects of feeding ratio on the stress states zone and the stress trajectory of typical points were analyzed by finite element method. The forming window of "internal pressure?axial feeding" was established to guide the loading paths. The results indicate that the feeding ratio can exert a crucial role on stress states. Fine adjusting feeding ratio can effectively avoid wrinkling. Meanwhile, the corresponding position of different experimental results in forming window was identified. Wrinkling or bursting would occur, and even these two defects would happen successively as the loading path exceeds the range of forming zone.
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