基于计算机仿真的核级蝶阀阀体铸造工艺研究

Simulation Research on Casting Process for Nuclear Grade Butterfly Valve Body

通过三维造型软件对蝶阀体创建实体三维造型,采用JSCAST软件模拟分析铸件的凝固及充型过程,预测铸件在铸造过程中所可能产生的裹气现象、充填不良、缩松及缩孔等缺陷问题,根据模拟的结果优化工艺参数。结果表明,铸造工艺经过改进后,充型时较为平稳,结束充型后铸件上的温差很小,且按照一定顺序进行凝固,无有害的热节存在,同时缩松及缩孔现象消失。

The 3D entity model of butterfly valve body was created by three dimensional modeling software, the solidification and filling process of the casting were analyzed by JSCAST simulation software, the wrapped gas, poor filling, shrinkage porosity and shrinkage cavity defects caused in the process of casting were predicted, then according to the simulation result, the process parameters were optimized. The results show that, using improved casting process, the filling is relatively stable, the temperature difference of the casting is small after filling, and the sequence solidification can realize. There exists not harmful hot-spot, and the phenomenon of shrinkage porosity and shrinkage cavity disappears.