(1. 東北大學 材料電磁過程研究教育部重點實驗室，沈陽 110004；
2. 東北大學 冶金學院，沈陽 110004)
摘 要: 提出一種約束控制金屬鼓包變形的新方法，研究線圈結構參數和電參數對電磁力分布規(guī)律的影響以及局部高頻交變磁場作用下金屬液面的變形和波動規(guī)律。結果表明：線圈結構參數決定電磁力的分布方式及分布范圍，合理設計線圈結構可得到理想的電磁力分布規(guī)律；電參數對金屬液內部電磁力的大小均有影響，但電流強度起主導作用；在局部交變磁場作用下，靜止的金屬液面會發(fā)生變形，液面的形狀與電磁力的分布形式相同。交變磁場自身會引起液面波動，波動較弱，電流強度達到1400 A, 最大波動幅度在±0.8 mm以內；高頻磁場作用于金屬液面鼓包變形處時，液面波動和鼓包高度明顯減弱，液面趨于平緩穩(wěn)定。
關鍵字: Ga-In-Sn合金；液面波動；高頻磁場；液面變形；磁壓力
（1. Key Laboratory of National Education Ministry for Electromagnetic Processing of Materials, Northeastern University, Shenyang 110004, China;
2. College of Metallurgy, Northeastern University, Shenyang 110004, China）
Abstract:A novel method controlling free surface fluctuation and deformation was presented. The effect of structural and electrical parameters of coils on the distribution regular of electromagnetic force (EMF) was investigated. The behavior of free surface fluctuation and deformation under high-frequency local magnetic field was also observed. The results show that structural parameters of coils determine the distribution form and action region of EMF. The desired EMF distribution may be obtained by rationally designing coil structural parameters. Although the magnitude of EMF is impacted by electrical parameters, current intensity plays a leading role. When the magnetic field imposing on stationary free surface, a deformation depending on the distribution of EMF forms. Besides, the free surface keeps fluctuating with small amplitude due to alternating electromagnetic force. The largest amplitude keeps within ±0.8 mm even if the current intensity reaches 1400 A. When free surface with bulge deformation is subjected to a high-frequency magnetic field, the fluctuation due to that liquid flow and the height of bulge have a decreasing tendency and the free surface tends to smooth and steady.
Key words: Ga-In-Sn alloy; free surface fluctuation; high-frequency magnetic field; free-surface deformation; magnetic pressure
