基于Dynaform软件平台,建立了Y型异径三通管三维弹塑性有限元模型.运用数值模拟方法,研究了AZ31镁合金Y型异径三通管热态内高压成形过程、成形缺陷、等效应变分布.探讨了初始管坯长度、左右冲头轴向进给量与成形支管高度之间的关系；研究得到了相同支管长度下成形不同Y型夹角三通管所需的左右冲头进给量.结果表明:随着初始管坯长度减小,支管高度随之增加；在左右进给量相同的情况下,左侧金属流向支管阻力更小,支管高度增加明显；随着Y型夹角的增大,右侧冲头进给增加,轴向补料比减小,总补料比增加,当夹角为90°时,左右补料相同.
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