为了研究辊缝收缩对减轻板坯中心偏析的作用,采用数值模拟方法计算了板坯的温度场和凝固收缩,分析了坯壳厚度和凝固收缩量在冶金长度内的分布,建立了3种辊缝收缩实验方案并比较了其效果.结果表明,在凝固末端以前2~3个扇形段进行辊缝收缩有效减轻了板坯中心偏析,辊缝收缩量应略大于铸坯自由凝固收缩量.
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