铝合金罐体低压铸造工艺研究与分析

Analysis of Low Pressure Casting Large Aluminum Alloy Shell

大型铝合金罐体由于体积大、结构复杂、凝固时间长,浇注时容易出现缩孔、缩松等缺陷。通过ProCAST软件对罐体铸造过程流场和温度场进行模拟分析,预测缺陷形成的区域。根据模拟结果,在产生缺陷区域安放冷铁能起到强制冷却作用,改善了铸件的温度场,使铸件符合顺序凝固的原则,有效地消除了铸件的缩松缺陷,经X射线检测合格。

Due to the large aluminum shell with large volume,complicated structure and long solidification time,it is easy to generate casting defects,such as shrinkage cavity and shrinkage porosity.The flow field and temperature field in pouring process were simulated by the ProCAST software to visualize the potential defect position.Based on the simulated results,chills were placed at the defective area to play a strong cooling forced,which could improve the temperature field of the casting and make the castings conform to the principle of sequential solidification,eliminating effectively the shrinkage in the casting and predicting the ogenerated defect region,so the quality of the qualified rate was improved.The product is qualified by X-ray detection.