【摘要】 采用铸造过程数值模拟分析技术,对七档自动变速箱前壳体的三种流道设计方案条件下流场分布进行对比分析,获得了最优浇注系统设计方案:即三个主浇道、一个辅助浇道的设计方案;并对最优浇注系统方案下铸件凝固收缩缺陷进行分析,确定模具冷却系统的最佳分布方案。通过优化工艺方案的实际产品气密性的检测和外观检测的结果表明:这种经过压铸工艺优化后的浇注系统和冷却系统设计方案较为合理,可为类似大型、复杂变速箱壳体高压铸造工艺方案的开发提供参考依据。更多还原

【Abstract】 After a detailed comparison of the mold filling simulation results of three different runner systems in the die design of a seven-gear auto transmission case casting,the optimal scheme of the runner system was obtained.Through the evaluation of the solidification simulation results on locations of hot spots and shrinkage porosities,the cooling design for the die was determined.The optimal die design of the casting was successfully used in practical application and the results for air-leakage test and the appearance observation of the castings show that numerical simulation could be used as a tool for the die design of large and complex die design and this optimal die design of the seven-gear auto transmission case could be used as a reference for the die design of similar products.更多还原