复杂钛合金铸件立式离心铸造过程的数值模拟

Numerical Simulation of Vertical Centrifugal Casting Process for Complex Ti Alloy Casting

利用三维可视化离心铸造数值模拟技术模拟某钛合金薄壁件的充型凝固过程,预测缺陷可能的位置。重点分析缺陷区域在不同转速下的缩松、缩孔分布情况,给出最佳转速。结果表明,缩松缩孔出现在铸件热节部位,与实际铸件X光检测显示一致。对比发现,在150r/min时的铸件缩孔明显减小。这是由于转速增大离心力增大,熔体充填型腔的能力增强,有效减小了缩孔体积,改善了缺陷情况。

The filling and solidification process of a thin-walled titanium alloy were simulated by the cen- trifugal casting numerical simulation technology of 3D visualization to predict the possible shrinkage zone in the parts. The shrinkage distribution under different rotation speeds was analyzed emphatically, and the optimized speed could be presented. The results reveal that the hot spot location from the visualiza- tion is well agreement with the X-ray detection. With the rotating velocity of 150 r/min, shrinkage hole size is decreased greatly, which is attributed to the increase of centrifugal forces improving the filling a- bility of the liquid metal to effectively decrease the shrinkage hole size and improve the defect condition.