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。
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 evolution 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 investigated. Through analyzing the shrinkage defects generated in various cooling modes, it is proven that the cooling pipe system set in the side mold alone is a valid way to enhance the cooling capacity at the rim/spoke junction areas.
出处
《中国机械工程》
EI
CAS
CSCD
北大核心
2006年第19期2034-2037,共4页
China Mechanical Engineering
基金
国家863高技术研究发展计划资助项目(2002AA331120)
关键词
镁合金
轮毂
缺陷
模具冷却性能
magnesium alloy
wheel
defect
cooling capacity in mold
