随着拉速的提高，铸坯在二冷区内停留时间更短，单位时间内导出的热量增加，凝固坯壳承受各种应变的 能力减弱。为研究高拉速小方坯连铸二冷支撑导向技术，基于弹性力学基础开发出三维蠕变有限元鼓肚计算软件，利用 黏弹性蠕变模型可准确地预测出方坯的鼓肚量，用于确定最优夹持长度，可为高拉速连铸机辊列设计提供有益参考。结 合生产统计数据，提出了足辊设计准则：生产160mm×160mm以上断面的普碳钢，一旦拉速超过5.2m/min需增设独立 的密排导向段才能有效控制铸坯的鼓肚变形。

With increasing casting speed, the residence time of a billet in the secondary cooling zone decreases, the heat derived per unit time increases, and the ability of the solidified billet shell to withstand various strains decreases. To study secondary cooling support guidance technology for high-casting speed billets, 3D creep finite element bulging calculation software was developed on the basis of elastic mechanics. The bulging volume of a billet can be accurately predicted via a viscoelastic creep model, which can be used to determine the optimal clamping length and provide a useful reference for the roll design of high-casting-speed continuous casting machines. On the basis of the production statistics data, the design criterion of foot roll is proposed; that is, when the casting speed exceeds 5.2 m/min, an independent dense guide roll segment should be added to effectively control the bulging deformation for the production of a 160 mm×160 mm cross section of an ordinary carbon steel billet.