以100 mm×100 mm大断面铜包铝棒坯为对象,建立棒坯连铸复合成形的数值模型,确定模型的边界条件,并通过设计的实验验证数值模型边界条件的准确性.基于验证的边界条件,采用ProCast软件对铜包铝棒坯立式连铸复合成形过程的稳态温度场进行数值模拟,得到了各工艺参数对连铸过程的影响规律,给出了工艺参数的调控策略和合理范围.结果表明,制备100 mm×100 mm大断面铜包铝铸坯的合理工艺参数范围为:在保持铜液温度1250℃的条件下,铝液铸造温度为760~790℃;一冷水流量为1600~2000 L/h;二冷水流量为900~1100 L/h;二冷水距结晶器石墨套出口距离为20 mm;拉坯速度为80~100 mm/min.
Taking the copper clad aluminum composite billet with a large section size of 100 mm×100 mm as an object, a numerical simulation of continuous core-filling casting was established. The boundary conditions of the numerical model were determined, and its accuracy was verified by convenient experiment. Based on the verified boundary conditions,the steady-state temperature field of large section copper clad aluminum during the casting was numerically simulated by ProCast software. The effect of each processing parameter on the casting processing is obtained and the controlling method and proper range of the processing parameters are given. The results show that the reasonable processing parameters in preparing copper clad aluminum in 100 mm×100 mm cross section are as follows: under the condition of the casting temperature of copper of 1250℃, the casting temperature of aluminum is 760?790℃, the flux of the first cooling water is 1600?2000 L/h, the flux of the second cooling water is 900?1100 L/h, the distance from the second cooling water to the exit of graphite crystallizer is 20 mm, and the withdrawing speed is 80?100 mm/min.
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