摘要
为了预测镁合金轮毂低压铸造过程中可能产生的缺陷,利用三维建模软件对镁合金轮毂进行数值建模并通过Procast模拟软件对镁合金轮毂的充型和凝固过程进行模拟分析。由于加压速度的快慢,对铸件充型的平稳性有很大影响,并且热节及孤立熔池部位极易产生缩孔缩松缺陷,因此对镁合金轮毂铸造过程的加压速度及温度场、流场进行研究。研究结果表明,通过降低加压速度能够很大限度地减少在浇注过程中所产生的气孔和缩孔缩松及氧化夹杂缺陷,对于轮辐处产生的热节,可以对该部位进行激冷处理,使其优先凝固,进而改善了铸件的质量。
In order to predict defects of a magnesium alloy wheel that may arise during the low pressure die casting, a three-dimensional mapping software was used to establish the solid model and the filling and solidification stages of the magnesium alloy wheel were simulated by the Procast software. Because the pouring velocity has a great influence on the state of filling, and the shrinkage can easily generate on the hot spot or isolated pool area, the research on pouring velocity, temperature, and flow field during the casting process of magnesium alloy wheels was conducted. The results show that the blowhole, shrinkage, dispersed shrinkage, and oxide inclusion at the top of the rim are eliminated effectively by reducing the pouring velocity. Adding chill on the part between the wheel rim and the wheel rib where the hot spot m.ay exist can make this part solid firstly, so that the quality of the casting can be improved.
出处
《铸造》
CAS
CSCD
北大核心
2011年第12期1214-1217,1221,共5页
Foundry
基金
辽宁省科技厅科学技术计划项目(项目编号2010221005)
关键词
镁合金
轮毂
低压铸造
数值模拟
magnesium alloy
wheel
low pressure die casting
numerical simulation
