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建立了环缝式电磁搅拌法制备半固态金属浆料系统电磁场的计算模型,采用商用ANSYS软件对制浆系统内电磁场分布进行了数值模拟,分析了电流、频率、坩埚材质、冷却器材质和环缝宽度对磁感应强度的影响规律,并进行了相应的实验验证.研究结果表明:电磁场模拟结果与实验结果具有较好地一致性,验证了计算模型与软件算法的可行性;系统电磁力主要分布于环缝内,提高了对合金熔体的搅拌强度;在相同的环缝宽度下,磁感应强度随频率的增大而依次减小,随电流的增大而依次增大;同时选用不锈钢坩埚与石墨冷却器可以使环缝内铝合金熔体的磁感应强度获得最大;相同电流和频率条件下,磁感应强度随着环缝宽度减小而逐渐增大;相同搅拌功率条件下,环缝式电磁搅拌法可以获得更加细小均匀的半固态组织,平均晶粒尺寸较普通电磁搅拌法减小31%.
The calculation model of electromagnetic field in semi-solid metal slurry system by ring-gap electromagnetic stirring was established. The distribution of electromagnetic field in pulping system was simulated by commercial ANSYS software. The current, frequency, material of crucible, The influence law of the width of the seam on the magnetic induction intensity, and the corresponding experimental verification.The results show that the electromagnetic field simulation results are in good agreement with the experimental results, and the feasibility of the calculation model and the software algorithm are verified. The electromagnetic field distribution of the system is mainly distributed In the girth, the agitation strength of the alloy melt is improved. Under the same girth width, the magnetic induction intensity decreases with the increase of the frequency and then increases with the increase of the current. At the same time, the stainless steel crucible and Graphite cooler can maximize the magnetic induction intensity of the aluminum alloy melt in the annular gap. Under the same current and frequency conditions, the magnetic induction intensity gradually increases with the decrease of the annular gap width. Under the same stirring power, the annular slot electromagnetic stirring Method can obtain more fine and uniform semi-solid structure, the average grain size is reduced by 31% compared with the conventional electromagnetic stirring method.