摘要
分析了实际生产中四种常见的球墨铸铁排气歧管的浇注缺陷,讨论了流场与温度对浇注的影响,并对传统的模具进行了优化设计。研究结果表明:铸件中氧化物的分布,既受浇注温度的影响,也受流场特性的影响,浇注过程中氧化物含量增多会大幅降低铸件的品质;将模具空腔内的流道尺寸优化后,液态金属具有持续稳定的流动,所产生的氧化物能够快速累积于冒口处,不会由于湍流的作用而滞留于铸件中,减少了缺陷,提高了排气歧管铸件质量。
The four common casting defects of nodular cast iron exhaust manifold in practical production process were analyzed, and the influence of flow field and temperature on the casting was discussed, and the optimal design of the traditional mold was carried out. The research results show that the distribution of oxide in the casting is not only influenced by the pouring temperature, but also influenced by the flow pattern. The increase of the oxide content can significantly reduce the casting quality. After optimization of the flow channel size in the mold cavity, the liquid metal has steady flow, and the oxide can quickly accumulate in riser and not be stranded in casting due to turbulence, which reduces the defects and improve the exhaust manifold quality.
出处
《热加工工艺》
CSCD
北大核心
2017年第13期247-250,共4页
Hot Working Technology
基金
武汉理工大学自主创新基金项目(2016-ND-C1-14)
关键词
球墨铸铁
排气歧管
浇注温度
流场
氧化物
nodular cast iron
exhaust manifold
pouring temperature
flow field
oxide
