大型铝合金铸件水力模拟与数值模拟的研究

Study on Hydraulic Simulation and Numerical Simulation of Large Aluminum Alloy Casting

为保证大型铝合金铸件的质量 ,通过水力模拟和数值模拟两个途径优化铸造工艺 ;水力模拟依据相似理论 ,建立水力模型 ,选出最佳浇注系统 ,防止吸气、浇不足等缺陷 ;数值模拟通过计算铸件动态温度场 ,来预测缩孔、缩松等缺陷 ,据此来改变冒口、冷铁的尺寸及数量 ,控制铸件凝固顺序 ,保证铸件内部质量。最后 ,综合水力模拟和数值模拟结果 ,确定了合理的工艺方案 。

Both hydraulic simulation and numerical simulation were used to optimize casting technology in order to ensure the quality of large aluminum alloy castings. Based on analogic theory, hydraulic model was founded to choose the optimum gating system for prevention from casting defects including gas hole and misrun. Numerical simulation was used to predict shrinkage cavity, porosity through calculating dynamic temperature field of aluminum casting. Based on numerical simulation, riser and chill size and amount were changed and casting solidification sequence was controlled to ensure inner quality of casting. At last, both hydraulic simulation and numerical simulation were synthesized to determine rational processing sketch for pouring success at first time