消除护壳铸件缩松缺陷的工艺实践

Process Practice of Eliminating Shrinkage of Protective Shell Castings

为了解决薄壁护壳铸件的局部热节缩松缺陷,对发生缺陷的部位进行了解剖观察,分析判定了产生缺陷的原因,改进了原有铸造工艺,并利用CAE模拟软件对改进工艺进行了数值模拟。模拟结果显示,改进工艺实现了铸件的顺序凝固,消除了局部热节缩松等缺陷,同时,为了解决了个别铸件的晶粒粗大问题,对原有热处理工艺进行调整,生产实践表明,采用改进、调整后的铸造及热处理工艺生产的护壳铸件,消除了上述缺陷,符合设计及技术要求。

By observing defect parts and analyzing the defect type,the original casting process was improved to solve the shrinkage porosity defects of thin protective shell castings,then the improved process was simulated by CAE software. The result shows that the improved process can realize progressive solidification and eliminate shrinkage porosity defects on the local hot spot. In addition, the original heat-treating process was improved to solve the grain coarsening defects. The production practice indicates that the improved casting and heat treatment process eliminated the above defects, which meets the design and technical requirements.