(1．清华大学 机械工程系， 北京 100084；
2. 北京科技大学 铸造研究所， 北京 100083；
3. 河北科技大学 材料科学与工程系， 石家庄 050054)
摘 要: 通过对凝固层的受力分析，提出了滞留层初期尺寸的预测模型及定量计算方法，并据此分析了各工艺因素的影响趋势。结果表明，在通常范围内增加结晶器直径或减小其长度、提高凝固系数或提高结晶器内的纵向温度梯度、减小拉坯速度、降低制浆室高度、改善结晶器润滑，都可以提高初期裂口的形成位置，减小滞留尺寸，进而有利于提高半固态连铸过程的稳定性。验证实验表明，这一预测模型的误差在5%～10%范围内。
关键字: 半固态金属； 连铸； 滞留层
（1. Department of Mechanical Engineering, Tsinghua University, Beijing 100084, P.R.China;
2. Foundry Research Institute, University of Science and Technology Beijing, Beijing 100083, P.R.China;
3. Department of Materials Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050054, P.R.China）
Abstract:Through mechanical analysis, the mathematics model to predict the dimension of the remained shell of semisolid continuous casting process is promoted and the influence of various process factors is discussed. The calculated results show that such methodsas increasing the diameter or decreasing the length of the copper mold, increasing the solidifying coefficient and the longitudinal temperature gradient in mold, decreasing withdrawal rate, decreasing the length of stirring chamber, or modifying the lubricating condition between copper mold and casting are beneficial to decreasing the dimension of the remained shell so as to modifying the stability of the process.The comparison between the calculated and the experimental results shows that the error of prediction is 5%～10%.
Key words: semisolid metals; continuous casting; remainedshell
