摘要
浇注了一系列的球墨铸铁件,解剖铸件,测定铸件缩孔体积。对铸件开展了凝固过程三维温度场数值模拟,并应用G/R法对铸件进行了缩孔缩松预测。结果表明,空间步长、时间步长、计算G/R值的评价温度以及判断缩孔缩松的临界值均影响G/R值,从而影响缩孔缩松预测的准确程度,G/R法不适用于球墨铸铁件缩孔缩松的预测。
Abstract A series of ductile iron sample castings were poured and dissected to determine the volume of shrinkage cavity of sample castings.The numerical simulation of 3D temperature field of castings during solidification process was carried out and the shrinkage cavity and porosity of sample castings were predicted using G/R method.The results showed that the G/R value are influenced by space increment,time increment,evaluation temperature of the computed G/R value and the critical value of predicting shrinkage cavity and porosity in castings,thus impairing the accuracy of its prediction.G/R method is not suitable for the prediction of shrinkage cavity and porosity of ductile iron castings.
出处
《铸造》
CAS
CSCD
北大核心
1998年第7期9-13,共5页
Foundry
基金
国家自然科学重点基金