摘要
采用MAGMA数值模拟软件对旁通阀铸件的熔模铸造工艺进行数值模拟及优化,通过分析金属液进入型腔时的流动,预判了可能因卷气、断流等造成的气孔、冷隔等缺陷。并在此基础上重新优化了浇口杯位置,对优化后工艺的充型、凝固过程进行模拟,预测了可能出现缩孔、缩松风险的位置。结果显示:工艺优化后,充型过程中金属液流动比较稳定,实现了铸件的顺序凝固,没有出现孤立液相区,仅有发生微小缩孔缩松的风险。在实际试制时,在浇道和内浇口等位置采用包保温棉来解决可能出现的缩孔、缩松风险。对试制生产的铸件进行X射线探伤及解剖验证,未发现缩松、缩孔、裂纹等缺陷。随炉试样化学成分、力学性能等均满足技术要求,这说明优化后的旁通阀铸件熔模铸造工艺合理。
The investment casting process of a bypass valve casting was numerically simulated and optimized by using MAGMA numerical simulation software.The casting defects such as porosity and cold shut caused by air entrainment and discontinuous liquid flow were predicted by analyzing the flow of the metal liquid into the mold cavity.On this basis,the position of the pouring cup was re-optimized,and the filling and solidification processes of the optimized process were simulated,and the location of the possible risk of porosity defects was predicted.The results show that after the process optimization,the metal liquid flow during the filling process is relatively stable,the sequential solidification of the casting is achieved,with no isolated liquid phase area,and it only has the risk of small shrinkage.In the actual trial production,package of insulation cotton was used in the runner and inner gate to solve the possible risk of shrinkage defects.The trial production castings were subjected to X-ray inspection and dissection verification,and no shrinkage,porosity and crack defects were found.The chemical composition and mechanical properties of the in-furnace samples meet the technical requirements,it shows that the investment casting process of the optimized bypass valve casting is reasonable.
作者
匡锐
杨国超
杨小建
马敏静
李冰雪
李丰
徐龙
KUANG Rui;YANG Guochao;YANG Xiaojian;MA Minjing;LI Bingxue;LI Feng;XU Long(Guangzhou Bureau of Naval Equipment Department,Kunming 650031,China;No.12 Research Institute of CSSC,Xingping 713102,China)
出处
《热加工工艺》
北大核心
2024年第23期130-134,140,共6页
Hot Working Technology
关键词
旁通阀铸件
熔模铸造
MAGMA
数值模拟
bypass valve casting
investment casting
MAGMA
numerical simulation
