锻压技术

AZ31镁合金电池筒反挤压工艺仿真研究

英文标题：Numerical study of backward extrusion process for AZ31 magnesium alloy battery cylinder

作者：孙颖迪陈秋荣

关键词：AZ31镁合金反挤压数值模拟电池筒

分类号：TG379

出版年,卷(期):页码：2015,40(3):46-52

摘要：

基于Deform-3D与AZ31镁合金材料模型对1号镁合金电池筒的反挤压成形过程进行数值模拟，完成模具设计及各工艺参数下反挤压成形过程的对比优化。结果表明：在相同挤压速度下，随挤压温度升高，等效应力峰值不断降低，等效应变峰值不断升高，温度场向高温区推进，并在280 ℃时，损伤值降至最低，说明在该温度下AZ31镁合金反挤压过程的破损率最小；另外，在280 ℃下，随着挤压速度的提高，等效应力场峰值不断减小，等效应变场峰值增大，温度场峰值向高温区推进，并在12 mm·s-1的挤压速度下达到损伤极值最小值。根据优化工艺进行反挤压成形试验验证，生产出了合格的产，品且筒壁组织均匀细化。

The backward extrusion process of No.1 magnesium alloy battery cylinder was simulated by Deform-3D software based on the model of AZ31 magnesium alloys. The die structure was designed and the backward extrusion process with different parameters was compared and optimized. The results show that with the same extrusion speed, the equivalent stress peak reduces continually and equivalent strain peak increases continually with the increasing extrusion temperature. When the temperature field moves to high temperature region, the damage value decreases to the minimum at 280 ℃, namely, the damage rate of the backward extrusion process for AZ31 magnesium alloys reduces to the minimum. In addition, at this temperature, the equivalent stress peak reduces continually and equivalent strain peak increases continually with the increasing extrusion speed. When the peak of temperature field moves to high temperature region, the damage value reduces to the minimum at the extrusion speed of 12 mm·s-1. The test of the backward extrusion was carried out by the optimized process. The qualified products were produced, and the microstructure of cylinder sidewall was uniform.

基金项目：

嘉兴市重大科技专项镁合金板型材加工技术研究及产业化（2010AZ2001）

孙颖迪（1983-），女，博士，助理研究员

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