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针对薄板坯连铸漏斗型结晶器内凝固过程,采用热弹塑性有限元法,考虑铸坯与铜板的接触状态,建立了热力耦合模型。模拟分析了铸坯经过结晶器过程中坯壳内的温度场和应力场,得到了凝固坯壳形成过程的传热和变形规律。模拟结果表明:铸坯角部温度高于宽面和窄面中心温度并出现两个平台期;两个弧线段交界区域出现应力峰值,是铸坯裂纹敏感区。该结果为漏斗型结晶器形状的设计、结晶器锥度的优化以及提高连铸坯质量提供理论依据和技术基础。
Aiming at the solidification process in thin slab continuous casting hopper mold, the thermoelastoplastic finite element method was used to consider the contact state between the slab and the copper plate, and the thermal coupling model was established. The temperature field and stress field in the billet during the mold process are simulated and the heat transfer and deformation rules of the solidified billet shell are obtained. The simulation results show that the corner temperature of the slab is higher than the center temperature of the broad face and the narrow face, and two plateau phases appear. The peak of stress appears at the boundary between the two arc segments, which is the sensitive zone of slab cracks. The results provide theoretical basis and technical basis for the design of funnel-shaped mold, the optimization of mold taper and the improvement of the quality of slab.