大斷面銅包鋁棒坯立式連鑄成形工藝參數對連鑄復合過程影響的數值模擬

大斷面銅包鋁棒坯立式連鑄成形工藝參數對連鑄復合過程影響的數值模擬Numerical simulation analysis of effects of processing parameters on forming process of vertical continuous core-filling casting for copper clad aluminum billets with large section

以100 mm×100 mm大斷面銅包鋁棒坯為對象，建立棒坯連鑄復合成形的數值模型，確定模型的邊界條件，并通過設計的實驗驗證數值模型邊界條件的準確性。基于驗證的邊界條件，采用ProCast軟件對銅包鋁棒坯立式連鑄復合成形過程的穩態溫度場進行數值模擬，得到了各工藝參數對連鑄過程的影響規律，給出了工藝參數的調控策略和合理范圍。結果表明，制備100 mm×100 mm大斷面銅包鋁鑄坯的合理工藝參數范圍為：在保持銅液溫度1250 ℃的條件下，鋁液鑄造溫度為760~790 ℃；一冷水流量為1600~2000 L/h；二冷水流量為900~1100 L/h；二冷水距結晶器石墨套出口距離為20 mm；拉坯速度為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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