(1．清華大學(xué) 機(jī)械工程系， 北京 100084；
2. 北京科技大學(xué) 鑄造研究所， 北京 100083；
3. 河北科技大學(xué) 材料科學(xué)與工程系， 石家莊 050054)
摘 要: 通過對(duì)凝固層的受力分析，提出了滯留層初期尺寸的預(yù)測(cè)模型及定量計(jì)算方法，并據(jù)此分析了各工藝因素的影響趨勢(shì)。結(jié)果表明，在通常范圍內(nèi)增加結(jié)晶器直徑或減小其長(zhǎng)度、提高凝固系數(shù)或提高結(jié)晶器內(nèi)的縱向溫度梯度、減小拉坯速度、降低制漿室高度、改善結(jié)晶器潤(rùn)滑，都可以提高初期裂口的形成位置，減小滯留尺寸，進(jìn)而有利于提高半固態(tài)連鑄過程的穩(wěn)定性。驗(yàn)證實(shí)驗(yàn)表明，這一預(yù)測(cè)模型的誤差在5%～10%范圍內(nèi)。
關(guān)鍵字: 半固態(tài)金屬； 連鑄； 滯留層
（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
