针对AZ31B铸轧镁合金板材温热拉深性能差的问题,提出预变形温热拉深工艺.对AZ31B铸轧镁合金板材在20～220 ℃进行预变形温热拉深实验研究.结果表明:预变形使铸轧镁合金板材的拉深性能明显改善,使AZ31B铸轧镁合金板材具有最佳拉深性能的冲头温度范围(20～95 ℃);凹模温度选择在160～220 ℃范围内,铸轧镁合金板材具有良好的拉深性能,极限拉深比可达到2.26;随着拉深成形温度的升高,工件中动态再结晶晶粒数量逐渐增加,220 ℃拉深成形时工件中再结晶晶粒分布趋于均匀.
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