基于数值模拟的导叶铸造缺陷分析及工艺优化

Defect Analysis and Technology Optimization of Vane Casting Based on Numerical Simulation

通过数值模拟技术分析了导叶铸件容易出现缩孔、缩松缺陷的位置,与生产实际吻合。针对铸造缺陷建立了导叶铸件合理的温度场。利用滚圆法设计出了导叶铸件的环形本体补贴,形成了导叶铸件顺序凝固时所需要的温度梯度场。优化的工艺解决了导叶铸件长轴和瓣体上缩孔、缩松等缺陷的问题。

The location of shrinkage and dispersed shrinkage in vane casting was analyzed by numerical simulation technology, and the result was in accordance with practical production. The reasonable temperature field against the casting defects was built, and the annular noumenon allowance of vane casting was designed by means of rounded technology. The temperature field which vane casting needed for sequential solidification was also set up. Finally, the shrinkage gradient and dispersed shrinkage of vane casting in the basic shaft and blade body was eliminated by the optimized technology.