水轮机转轮体铸造工艺设计与优化

摘要

The process characteristics of low alloy steel turbine runner body by sodium silicated-bonded sand are studied; the casting process is designed and optimized. The casting is modeled by SolidWorks software, and the flow field and temperature field of the casting filling process are simulated by AnyCasting software. The final casting process is determined, and verified by experiments. The results show that adopting stepwise pouring way can ensure the melt being filled smoothly and completely. The shrinkage and dispersed shrinkage of the casting can be efficiently eliminated by using of riser and chill. With optimal process scheme, the casting of low alloy steel turbine runner body is totally shaped and has a legible contour, and there are not obvious casting defects in the casting.%分析了水玻璃砂铸造低合金钢水轮机转轮体的工艺特点,对铸造工艺方案进行设计与优化.采用SolidWorks软件对铸件进行三维实体建模,利用AnyCasting软件对铸件充型过程的流场及温度场进行数值模拟.确定最终铸造工艺,并通过实验进行验证.研究结果表明:转轮体铸件选取阶梯式浇注系统,可以保证金属液平稳、完全充型;采用冒口与冷铁配合使用时可以有效消除铸件的缩孔与缩松.采用优化后的铸造工艺设计方案生产的铸件充型完整,铸件轮廓清晰,内部没有明显的铸造缺陷.