铍铝合金支撑座熔模铸造数值模拟

Numerical Simulation of Solidification Process of Be-Al Alloy Bracket in Investment Casting

铍铝合金具有很宽的结晶温度区间,铸造凝固过程中易出现缩孔缩松等缺陷。为了优化其工艺方案,采用ProCAST软件对铍铝合金支撑座熔模铸造过程的温度场、流场进行数值模拟,预测缩孔缩松缺陷分布规律,并进行浇注实验验证。结合模拟结果对铸造工艺参数进行优化,结果表明,在优化浇道位置的同时,将铸件薄壁位置壁厚从6 mm增加至10 mm,可有效抑制铸件中缩孔缩松缺陷的产生。

Due to large freezing range, shrinkage porosity frequently occurs in Be-Al alloy castings. In order to optimize casting process parameters, the investment casting process of Be-Al alloy bracket was studied by numerical simulation method. The evolutions of the flow field and temperature field as well as the formation of shrinkage porosity defect were simulated, and a pouring experiment was carried out to verify the simulation results. Based on the simulation results, the casting process parameters were optimized. The results show that shrinkage defects in the casting could be reduced, when the gate location was optimized and the wall thickness of the casting increased from 6 mm to about 10 mm.