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中文摘要：
对于Y型三通管，由于其结构的不对称性，内高压成形过程中左右冲头的轴向补料比对成形有较大的影响。通过实验和数值模拟，研究了补料比对Y型三通管的壁厚影响规律以及成形中产生的缺陷。结果表明：成形后零件左侧过渡区圆角处壁厚最大，右侧过渡区圆角处次之，枝管顶部壁厚最薄；增加补料比能在一定程度上改善枝管部分的壁厚减薄，但过度加大左右补料比，会使试件左侧圆角处产生内凹缺陷。
英文摘要：
Tube hydroforming is a process to manufacture lightweight components, especially automotive parts, with advantages of cost and weight reduction, better structural integrity and increased strength and stiffness over the conventional process. For hydroforming a Y-shape tube, ratio of left axial feed and the right has a remarkable impact on the forming process due to non-syrmnetrie structure. The effect of this ratio on thickness distribution and forming defeet was investigated through experiments and numerical simulation. The results show that after forming the left fillet transition region is the thickest, the right is thicker and the top of the protrusion is the thinnest. It can reduce the thinning tendency through increasing the ratio of axial feed. However, an excessive ratio of axial feed will lead to dimpling and even wrinkling. A reasonable ratio zone of axial feed for hydrforming Y-shape tube is confirmed.
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