中文摘要：

将结晶器移出感应加热器,使连续定向凝固时固液界面控制在结晶器出口;结合传热边界条件,求解连续定向凝固熔体区、液/固界面、空冷区和水冷区的一维稳态温度场方程,得出线坯最大稳态拉坯速度随熔体温度、结晶器长度、冷却距离和冷却水流量的变化规律;并基于直径为6 mm的Cu-12%Al（质量分数）线材制备的工艺条件,对理论解进行实验验证和讨论。结果表明：Cu-12%Al线材的最大稳态拉坯速度随熔体温度升高而降低,且降低速率逐渐减小,其中在1 150～1 300℃范围内降低37.3%;最大稳态拉坯速度随结晶器长度增加而增加,且增加速率逐渐减小,其中在20～40 mm范围内增加28.5%;最大稳态拉坯速度随冷却距离增加而降低,且降低速率逐渐减小,其中在4～12 mm范围内降低68.8%;冷却水流量在100～400 L/h范围内最大稳态拉坯速度变化不明显。当固液界面前沿温度梯度小于2.02℃/mm时,实际拉坯速度无法达到理论最大稳态拉坯速度;当固液界面前沿温度梯度大于4.17℃/mm时,最大稳态拉坯速度实验值和理论值吻合较好。

英文摘要：

By moving out of induction heater for crystallizer,the solid-liquid interface was controlled at the exit of crystallizer during Ohno continuous casting（OCC）.Based on the temperature field equations of melt region,liquid/solid interface,air cooling region and water cooling region,the relationship was deduced among the maximum steady-state drawing velocity,melt temperature,crystallizer length,cooling distance and water flow rate by using thermal boundary conditions.Through the solidification process of Cu-12%Al（mass fraction） wires with a diameter of 6 mm,the theoretical solutions were verified and discussed.The results show that,the maximum steady-state drawing velocity for Cu-12%Al wire decreases by 37.3% in the range of 1 150-1 300 ℃ with increment of melt temperature,increases by 28.5% in the scope of 20-30 mm with increment of crystallizer length,and decreases by 68.8% in the range of 4-12 mm with increment of cooling distance,changes weakly with cooling water flow rate in the range of 100-400 L/h.When the thermal gradient at solid-liquid interfaces is lower than 2.02 ℃/mm,the experimental drawing velocity cannot reach the theoretical maximum steady-state drawing velocity.When the thermal gradient at solid-liquid interface is higher than 4.17 ℃/mm,there is a good agreement between the experimental and theoretical values of the maximum steady-state drawing velocity.