链轮球铁件缩孔、缩松的改进措施
mproving Measures of Shrinkage and Porosity in Ductile Iron
李德胜1， 周建强1， 梅建春2， 纪玉华1
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作者单位：1.青岛农业大学 机电工程学院，山东 青岛 266109； 2.泰安鸿昌达铸造有限公司，山东泰安 271000
中文关键字： 球墨铸铁； 缩孔缩松； 均衡凝固理论
英文关键字：ductile iron; shrinkage and porosity; proportional solidification theory
中文摘要：对球铁链轮铸件缩孔、缩松的形成机理进行了分析研究，提出了提高砂型紧实度、控制碳当量在4.4%～4.6%之间、控制浇注温度在1350～1380 ℃之间、采用均衡凝固技术设置雨淋式浇注系统、压边冒口和冷铁等措施。经实际生产的验证，基本上消除了缩孔、缩松缺陷。
英文摘要：The formation mechanism of shrinkage and porosity in the ductile iron sprocket casting was analyzed. The improving measures were proposed such as increasing sand compactibility, controlling carbon equivalent at 4.4%～4.6%, controlling pouring temperature at 1350～1380 ℃, setting up shower gating system, edge riser and iron chill with the theory of proportional solidification, etc. Shrinkage and porosity were basically eliminated by actual experiment.