7050铝合金圆锭软接触电磁铸造过程数值模拟  

Numerical Simulation of Soft-Contact Electromagnetic Casting Progress for 7050 Aluminum Alloy Round Ingot

作　　者：郭世杰[1] 薛冠霞[1] 徐义[1] 王家淳[1] 

机构地区：[1]苏州有色金属研究院,江苏苏州215026

出　　处：《铸造》2010年第5期487-490,494,共5页Foundry

基　　金：江苏省自然科学基金(BK2008562)

摘　　要：模拟研究了7050铝合金圆锭常规铸造和软接触电磁铸造过程中的温度场和流动场。首先模拟了Ф300mm铸锭常规铸造过程中铸锭内部的温度变化，模拟结果与试验结果吻合良好，验证了模拟模型的准确性；利用该模型研究了软接触电磁铸造过程中Ф500mm铸锭的温度变化规律。结果表明，施加软接触电磁场后，金属熔体受到分布于边部并指向中心的电磁力作用，电磁力的方向与铸锭轴线成一定的倾角。常规铸造时，Ф500mm铸锭的液穴深度为212mm。施加强度为0．3T、频率为5～100Hz的软接触电磁场后，铸锭液穴深度降至113～172mm。当频率在10～25Hz范围内变化时，铸锭液穴深度降至最低，为113-122mm。The temperature and melt flow distribution of 7050 alloy billets cast in the conventional DC casting and soft-contact electromagnetic casting were simulated and studied. The temperature field of Ф300 mm 7050 billet was simulated and compared to the experimental results. The calculated results were in good agreement with the experimental measurements, which verified the mathematic model applied in the simulation. Based on the verified mathematic model, the changes of temperature field and melt flow of Ф 500 mm 7050 billet were investigated. The results indicate that the melt was subjected to the Lorentz force directing to the axis of the billet after applying the soft-contact electromagnetic field. The depth of the sump was 212 mm when the billet was cast in the conventional conditions. However, after applying the soft-contact electromagnetic field with the frequencies from 5 Hz to 100 Hz, the sump of the billet was decreased to the range of 113-172 mm. When the frequencies of the electromagnetic field was in the range of 10-25 Hz, the sump of the billet was shallower, which changed in the range of 113-122 mm.

关 键 词：软接触电磁铸造 7050圆锭 液穴深度 

分 类 号：TG292[金属学及工艺—铸造]