动力涡轮机匣熔模铸造浇注系统优化设计与应用验证

Design Optimization and Application Verification of Investment Casting Process for Power Turbine Casing

针对某航空发动机用动力涡轮机匣熔模铸造过程,基于机匣的结构特征与前期浇注系统设计方案,结合实际浇注试验,对铸件的缩松、缩孔等缺陷形成机制进行了研究。在此基础上,设计了新的浇注系统,并采用ProCAST软件对机匣的熔模铸造工艺进行数值模拟,通过改变金属液的流向及提高补缩能力等手段,实现了铸造缺陷的控制。结果表明,动力涡轮机匣的冶金质量符合要求。

According to the investment casting process of a power turbine casing for an aero engine,the structure characteristics of the power turbine casing and the design scheme of the initial gating system were analyzed,and the formation mechanism of the shrinkage porosities(holes)defects in the turbine casing was described in combination with the actual casting process.A new casting system was designed based on the above analysis,and the casting process of the power turbine casing was simulated by the ProCAST software.The casting defects were controlled by changing the flow direction of the metal liquid and improving the filling capacity.The pouring test shows that the metallurgical quality of the power turbine casing can meet the requirements.