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中文摘要：
摘要面向航空航天轻量化制造对超薄三通管的需求，开展了不锈钢和铝合金薄壁三通管内高压成形研究。通过内高压成形实验研究，给出Y型不锈钢三通和铝合金三通内高压成形典型缺陷，采用合理的加载路径和预成形工序，实现了径厚比（原始管材直径和壁厚的比值）为183的超薄不锈钢Y型三通管和径厚比为40的铝合金薄壁三通管内高压成形。通过不同补料比Y型三通管内高压成形实验研究，分析了补料比对Y型三通管壁厚和形状的影响，指出因Y型三通管两端非对称，补料比是Y型三通管内高压成形的关键工艺参数。
英文摘要：
Hydroforming processes of a thin-walled stainless steel and an aluminum alloy three-way tube are investigated to meet the lightweight demand of aerospace craft. Through experimental research, typical defects in hydroforming of Y-shaped three-way tubes of stainless steel and aluminum alloy are found out. By applying reasonable loading path and preforming process, the thin-walled stainless steel three-way tube with a diameter-to-thickness ratio of 183 and the aluminum three-way tube with a ratio of 40 are produced. Effects of axial feed ratio on thickness distribution and profile of the three-way tube are analyzed through hydroforming experiments with different axial feed ratios. It is concluded that because the Y-shaped three-way tube is asymmetric, the axial feed is a vital parameter to form the three-way tube.
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