对紫铜长支管T型管复合胀形工艺进行了试验研究，介绍了包括冲头挤压力的公式与计算，试验中所用复合胀形模具结构和部分重要零件的设计与选取及试验结果。
A technology to form copper long-branch tee pipe directly in compound forming of bulging and extrusion is developed, the formula and calculation of the forming force are introduced.
分析了挤压翻边与传统翻边应力状态的不同之处，以及翻边凸模的冲头曲率半径对翻边效果的影响。
The differences of stress state between extrusion-flanging and traditional flanging, and the influences of curvature radius of burring punch on flange height were analyzed.
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