基于流场优化的熔模铸钢件缩孔缺陷改善

Shrinkage Defects Improvement of Steel Casting Investment Casting Based on Flow Field Optimization

某大型熔模铸钢件试制过程中出现了严重缩孔缺陷,通过仿真分析发现金属液充型顺序不合理是导致铸件产生缩孔缺陷的主要原因。为消除浇口根部缩孔缺陷,基于流场优化法改进了工艺方案。流场模拟结果看出,优化方案充型合理,实物验证缩孔消除。基于这一缺陷改善经验,对前期生产中浇口根部出现严重缩孔缺陷的另一产品进行了工艺优化,改善充型过程,经批量生产验证,缩孔缺陷完全消除。

Batches of serious shrinkage defects occur in the process of trial-produce of large-scale steel investment casting. It is conjectured that the unreasonable filling sequence could be the main reason of shrinkage defects according to the results of flow field. And then improvement project was put forward based on flow field optimization. Simulation analysis shows that the improvement project has reasonable flow field. And physical verification shows that the improvement project has no defects. Based on the successful experience, casting process of the other product was optimized to improve the filling process. Production validation results indicate that the defects were eliminated entirely.