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基于连铸坯壳应力遗传特性建立二维方坯热力耦合模型,利用有限元分析软件ANSYS多载荷步法进行求解。模拟并对比了3种不同结晶器锥度值下的铸坯气隙生成及其分布规律。结果表明:离弯月面60～72mm角部首先出现气隙,随后向铸坯表面中心逐渐扩展,在结晶器出口处仅铸坯表面中心区域坯壳与结晶器存在接触。在结晶器上部300mm内气隙生长速度较快。随着离开弯月面距离增加,气隙生长速度逐渐降低。气隙宽度沿结晶器高度方向分布基本符合抛物线规律。随着锥度增加,气隙出现时机逐渐推迟,气隙宽度和存在范围也相应缩小。
A two-dimensional billet thermal coupling model was established based on the stress inheritance of slab shell. The finite element analysis software ANSYS multi-load step method was used to solve the problem. The formation and distribution of slab air gap were simulated and compared under three kinds of different mold taper values. The results show that the air gap first appears at the corner of 60 ~ 72mm from the meniscus and then gradually expands to the center of the slab surface. At the outlet of the mold, only the blank shell contacts the mold in the center of the slab surface. In the upper mold 300mm air gap growth rate faster. As the distance from the meniscus increases, the airgap growth rate gradually decreases. The width of air gap along the height direction of the crystallizer basically parabolic law. As the taper increases, the timing of the air gap is gradually delayed, and the width and extent of the air gap are correspondingly reduced.