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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。
Based on Dynaform software platform, a three-dimensional elasto-plastic finite element model of Y-shaped reducer was established. The numerical simulation method was used to study hot forming internal pressure forming process, forming defects and equivalent strain distribution of AZ31 magnesium alloy Y-type reducing tee. The relationship between the initial tube blank length and the axial feed rate of the left and right punches and the height of the forming branch pipe was discussed. The left and right punch feed rates for forming the Y-shaped tee angle tee with the same branch length were obtained. The results show that the height of the branch pipe increases with the decrease of the initial length of the billet. With the same amount of left and right feed, the resistance of the left metal flow to the branch pipe is smaller and the height of the branch pipe increases obviously. Large and right punch feed increases, the axial feed ratio decreases, the total feed ratio increases, when the angle is 90 °, about the same feed.