大径流涡轮壳铸造工艺研究

Research on Casting Process of Large Runoff Turbine Casing

采用Magma软件对涡轮壳进行铸造工艺模拟,根据模拟结果对铸造工艺进行优化,解决壳体厚大部位缩松难题。涡轮壳流道表面粗糙度及尺寸精度要求较高,采用热芯盒覆膜砂工艺,型、芯砂用覆膜砂,用树脂砂砂型套工艺增加砂型强度,以益于铸件自补缩,提高铸件的致密性。利用优化工艺生产的铸件,表面质量、尺寸精度均满足要求。

The casting process of turbine casing was simulated by Magma software. According to the simulation results the casting process was optimized to solve the shrinkage porosity in thick part. Due to the high requirement of surface roughness and dimensional precision of turbine casing, hot box coated sand technology was used. The core was made of coated sand. However, resin sand mold sleeve was used to enhance the strength of the mold, promote self-feeding and improve density of casting. The surface quality and dimensional accuracy of the castings produced by the optimized process meet the requirement.