基于液态渣动量和质量守恒原理,建立结晶器非正弦振动模式下弯月面区液体摩擦力计算模型, 通过分析 2.0m×min$-1拉速时液体摩擦力极值问题, 提出新的液体摩擦机制. 研究表明:液体摩擦力受渣道形状、熔渣池深度 和结晶器与铸坯间相对运动状态等影响,并随振动波形变化; 理想状态下最大液体摩擦力发生在振动速度与拉速相等时刻附近; 表面裂纹生成于临近负滑脱段的正滑脱时段内,并在负滑脱段得到愈合.
On the basis of laws of momentum and mass conservation of liquid flux, a mathematical model to represent the liquid friction force in meniscus under non-sinusoidal oscillation was established, and a new liquid friction mechanism was proposed by solving extremum equations of liquid friction force as 2.0 m•min-1 casting speed. The results show that liquid friction force was mainly influenced by the shape of flux channel, depth of molten flux pool and relative motion between oscillating mold and strand and varies with oscillation waveform. Maximum liquid friction force occurs nearby the moment of oscillation velocity equal to casting speed under an ideal state. Surface cracks formed in the positive strip time adjacent to negative strip time, and healed during the negative strip time.
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