铝合金汽缸盖低压铸造数值模拟及工艺优化
Numerical Simulation and Process Optimization on Low Pressure Casting for Aluminum Alloy Cylinder Head
赵建华1,2， 刘 涛1， 曾 礼1， 徐 慧1
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作者单位：1. 重庆大学 材料科学与工程学院，重庆400045； 2. 重庆大学 国家镁合金材料工程技术研究中心，重庆400045
中文关键字： 汽缸盖； 数值模拟； 工艺优化； 低压铸造
英文关键字：cylinder head; numerical simulation; process optimization; low-pressure casting
中文摘要：利用铸件凝固过程数值分析方法研究了铝合金汽缸盖的低压铸造凝固过程，预测了缸盖铸件内部可能产生的缺陷。模拟显示，内浇口到零件厚壁之间的通道易形成缩孔缺陷。根据模拟结果及理论，对低压铸造工艺进行了优化设计，分别采用增设冷却系统、控制模具的预热温度、对浇口进行保温处理三种工艺措施。同时采用上述三种工艺措施，对消除缸盖铸件热节点的缩孔、缩松缺陷效果最好。
英文摘要：The method of casting solidification numerical analysis was used to study the solidification stage of aluminum alloy cylinder head in low-pressure casting process， the inner defects of cylinder head casting were predicted. The results indicate that the shrinkage defects are prone to form at the passage between ingate and thick wall of part. According to the simulation results and theory, the low pressure casting process is optimized. The measures of adding cooling system, controlling the die's preheating temperature and heating treatment on the ingate are adopted. The combination of above three measures is best for the elimination of the casting's hot node and shrinkage defects.