镁合金轮毂低压铸造模具冷却与温度场的模拟  

Investigation of Cooling Capacity and Temperature Field Simulation in Mold during LPDC of Magnesium Wheel

作　　者：谢敏[1] 王迎春[1] 李大永[1] 彭颖红[1] 曾小勤[2] 

机构地区：[1]上海交通大学机械与动力工程学院知识工程研究所,上海200030 [2]上海交通大学材料科学与工程学院轻合金精密成型国家工程研究中心,上海200030

出　　处：《铸造技术》2005年第4期296-299,共4页Foundry Technology

基　　金：国家863计划重点项目(2002AA331120)资助

摘　　要：在镁合金轮毂低压铸造过程中,易在轮辋与轮辐连接处产生热节,对产品的质量造成不良影响。本文运用软件PAM CASTTM对这些部位的模具冷却性能进行研究,分析不同冷却方式对热节产生的影响。通过对比发现单独设置侧模冷却管道是一种有效的冷却方式,能够很好地减小镁合金轮毂低压铸造凝固过程中在轮辐与轮辋连接处所产生的合金液体孤岛体积,使其位置向轮心方向移动,进而降低这些区域的缩孔缺陷。最后,对铸造过程的模具温度场进行了循环模拟,确定稳定生产前的浇注次数。The hot spots are easy to form at the rim/spokes junctions during the magnesium alloy wheel low pressure die casting, which have detrimental effect on the products. In the paper, the cooling performance at these key areas of mold was investigated using PAM-CASTTMin the casting process. Through analyzing the shrinkage defects generated in various cooling modes, it was found the cooling pip system set in the side mold alone was a valid way to enhance the cooling capacity at the rim/spoke junctions. The mode not only lowered obviously the volumes of hot spots at the areas, but also transferred the positions of the hot spots towards the center of wheel. Considering the great effect of temperature field in the mold to the quality of the casts, the simulation of the temperature distribution in the mold was implemented at last to ascertain the number of the cycles before the steady production.

关 键 词：镁合金 轮毂 模具冷却性能 温度场的模拟 

分 类 号：TG27[金属学及工艺—铸造]