文档介绍：2
中国机械工程第 17 卷第 19 期 2006 年 10 月上半月
镁合金轮毂低压铸造工艺数值模拟
彭颖红1 王迎春2 李大永1
1. 上海交通大学,上海,200030
2. 宝山钢铁股份有限公司,上海,200030
摘要:对汽车上镁合金轮毂的低压铸造过程进行了数值模拟,研究了填充和凝固过程中温度
场与流场的分布,预测在此过程中可能出现的各种缺陷,结果发现,通过降低浇注速度,可有效地
消除在浇铸过程中所产生的气孔和部分缩孔缺陷。对于容易在轮辋与轮辐连接处产生的热节,
通过对这些部位的模具冷却性能进行研究,分析了不同冷却方式对热节产生的影响,结果发现,
单独设置侧模冷却管道是一种有效的冷却方式,可以使热节减小,并使其位置发生改变。
关键词:镁合金;轮毂;缺陷;模具冷却性能
中图分类号: TG292 ; TG21 文章编号:1004 —132X(2006) 19 —2034 —04
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Numerical Simulation of Low Pressure Die Casting of Magnesium Alloy Wheel
Peng Yinghong1 Wang Yingchun2 Li Dayong1
1. Shanghai Jiaotong University , Shanghai , 200030
2. Baoshan Iron & Steel Co. , Ltd. , Shanghai , 200941
AbsΟtract : The simulation of low pressure die casting process of a magnesium alloy wheel was presented.
Through calculating the temperature field and the velocity field during filling and solidification stages , the e
volution of temperature and liquid fraction was analyzed. Then , the potential defects including the gas pores in
the middle of the spokes , shrinkages at the top of the rim and the rim/ spokes junctions were predicted. The
reasons for these defects were also analyzed and the solutions to eliminate them were put forward. The air gas
pores and the shrinkages at the top of the rim were eliminated effectively by reducing the pouring velocity.
Furthermore , the cooling capacity at the rim/ spokes junctions was also i