钛合金立式离心熔模铸造凝固缺陷数值模拟

Numerical Simulation of Solidification Defects in Titanium Alloy by Vertical Centrifugal Investment Casting

对立式离心铸造的自由表面模型进行分析,以等效液面下降法为理论基础,建立了一种基于等效高度区间的立式离心铸造凝固过程数值方法来模拟空缺体积分配方法,实现了立式离心铸造凝固缺陷的计算。分别在重力铸造与离心铸造工艺下,使用山字型铸件对立式离心铸造的缺陷计算结果进行验证。结果表明,基于等效高度区间的立式离心铸造凝固过程数值模拟空缺体积分配方法,可以实现对铸件离心铸造中缩松、缩孔缺陷的定量计算。

The free surface model of vertical centrifugal casting was analyzed.Based on the equivalent liquid surface descent method,a vacancy volume distribution method for numerical simulation of solidification process by vertical centrifugal casting based on the equivalent height interval was established,and the calculation results of solidification defects by vertical centrifugal casting was achieved.The defect calculation results of vertical centrifugal casting were verified by 山 shaped casting under gravity casting and centrifugal casting,respectively.The results indicate that the quantitative calculation of shrinkage porosity and cavity defects in centrifugal casting can be realized through vacancy volume distribution method for numerical simulation of solidification process by vertical centrifugal casting based on equivalent height interval.