由于Y型三通管结构不对称,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.利用数值模拟,基于Dynaform软件平台,建立了Y型三通管弹塑性模型,并利用该模型研究了镁合金Y型三通管热态内高压成形过程、塑性变形规律、失稳行为、各种成形缺陷以及补料比对成形的影响.结果表明；成形后零件左侧圆角过渡区壁厚最大,支管顶部壁厚最薄；随着补料比的增加,支管高度也随之增加,并在一定程度上能改善支管的壁厚减薄,但过度加大补料比会使支管顶部减薄严重.%Owing to the structure asymmetry of Y-shaped tube, there was a great influencc of axial feed ratio on hydroforming. With numerical simulation, based on Dynaform software platform, an elastic-plastic finite element model for Y-shaped tube was established, and the warm hydroforming process of Y-shaped tube by using the model, plastic deformation laws and failure behavior, kinds of defects in forming and effects of axial feed ratio on forming were studied. The results show that after forming the left fillet transition region is the thickest, and the top of the branch is the thinnest; the branch height also increases with the axial feed ratio increasing, and to some extent, it can improve the thinning of the branch, but an excessive axial feed ratio will lead the top of the branch to thinning seriously.
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