消失模铸钢件侵入性气孔产生的原因与防止措施
Forming Reasons and Precaution Measures of Irruptive Gas-holes in Steel Casting with Lost Foam Casting
王孝良，武晓峰
点击：2881次 下载：0次
作者单位：辽宁工业大学 材料科学与工程学院, 辽宁 锦州121001
中文关键字：消失模铸造；铸钢件；侵入性气孔
英文关键字：lost foam casting; steel casting; irruptive gas holew
中文摘要：金属液与模样之间形成的气膜压力，模样受热形成的液态残留物聚集在与液态金属接触的涂料层界面的气体压力，二者增大分别是铸件顶部和侧表面形成侵入性气孔的主要原因。增加浇注时间、顶部或阶梯浇注、降低泡沫模样密度及增加涂层透气性是防止消失模铸钢件侵入性气孔的有效措施，这已在生产中得到验证。
英文摘要：The gas film pressure between liquid metal and foam, and the gas pressure of the interface between liquid metal and coating layer, increases of them both are the main reasons of forming irruptive gas hole in the top and side surface of the casting, respectively. Increasing pouring time, using top or step gating system, reducing the density of foam and increasing coating permeability are the effective measures to prevent the irruptive gas hole of steel casting in lost foam casting, which has been verified in production.