摘要
将石膏型熔模铸造和反重力铸造工艺相结合进行镁合金铸造，研究了充型压力对ZM5镁合金石膏型薄壁件成形及铸态组织和力学性能影响，结果表明，最佳成型压力为40kPa时，铸件成形较好，镁合金铸态力学性能最佳，试样抗拉强度为（19±5）MPa，延伸率为（1．54±0．2）％。生产结果证明，铸型预热温度330-350℃，镁合金浇注温度730-750℃，成型压力35-40kPa，能够满足镁合金薄壁件成形要求。
The gypsum mould and counter gravity casting process are combined for magnesium alloy casting to study the effect of pouring pressure on formation of the thin-wall casting and its microstructure and mechanical property of ZM5 magnesium alloy. The results showed that, the optimal pouring pressure with maximum mechanical proper-ty of ZM5 magnesium alloy. The results showed that, the optimal pouring pressure with maximum mechanical properties is 40 kPa at which formation of the thin-wall casting is better and tensile strength is （192±5） MPa, elongation （1. 5±0. 2）%. Production results show, the casting process with preheating temperature 330--350 ℃, pouring tern-perature 730-750 ℃ and pouring pressure 35--40 kPa, can meet the need of thin-wall casting of magnesium alloy.
关键词
ZM5镁合金
反重力铸造
充型压力
显微组织
力学性能
ZM5 magnesium alloy, counter gravity casting, pouring pressure, microstructure, mechanical property
