镁合金轮毂低压铸造工艺数值模拟.pdf

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 1 2 1 彭颖红 　王迎春 　李大永 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 : T G292 ; T G2 1 　　　文章编号 :1004 —132X 2006 19 —2034 —04 Numerical Simulation of Low Pressure Die Casting of Magnesium Alloy Wheel Peng Yinghong1 　Wang Yingchun2 　Li Dayong1 1. Shanghai Jiaotong Univer sity , Shanghai , 200030 2 . Bao shan Iron Steel Co . , Lt d. , Shanghai , 20094 1 Abstract : The simulation of low p ressure die casting p rocess of a magnesium alloy wheel was p resented. Through calculating t he temp erature field and t he velocity field during filling and solidification stages , t he e volution of temperature and liquid fraction was analyzed. Then , the potential defect s including t he gas pores in t he middle of t he spokes , shrinkages at t he top of t he rim and t he rim/ spokes j unctions were p redicted. The reasons for these defect s were al so analyzed and t he solutions to eliminate t hem were p ut forward. The air gas pores and t he shrinkages at t he top of t he rim were eliminated effectively by reducing t he pouring velocity . Furt hermore , t he cooling capacity at t he rim/ spokes j unctions was al so investigated. Through analyzing t he shrinkage defect s generated in various cooling modes , it is p roven t hat t he cooling