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结合真空差压铸造特点,采用专业流体软件ANSYS Fluent中标准k-ε模型对铝合金真空差压充型过程进行数值模拟,对某复杂薄壁铝合金壳体铸件进行了试制,并对模拟结果进行了验证与讨论。充型模拟结果表明,随着真空压力降低,真空度越高,铝合金液态金属的充型速度加快,充填形态更为平稳,无明显波动现象;在真空度为20kPa时,铝合金铸件充型完整,卷气和裹气现象明显减少。实际结果与充型过程的模拟预测相符合。
Combined with the characteristics of vacuum differential pressure casting, a standard k-ε model of professional fluid software ANSYS Fluent was used to simulate the process of aluminum alloy vacuum pressure filling. The casting of a complex thin-walled aluminum alloy shell was tested and the simulation results Verified and discussed. Filling simulation results show that with the decrease of vacuum pressure, the higher the degree of vacuum, the filling speed of aluminum alloy liquid metal is accelerated, the filling morphology is more stable, no obvious fluctuations; in the vacuum degree of 20kPa, aluminum alloy casting filling Complete, curly air and wrapped the phenomenon significantly reduced. The actual results are consistent with the simulation prediction of filling process.