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为确保提高连铸板坯铸坯内部质量,开发了一套完整的轻压下模型,包括凝固传热、二冷水动态控制和辊缝控制模型,并对动态轻压下技术的关键参数进行了优化.通过射钉实验和铸坯表面温度测量,对该模型进行了校核.实验结果与模型计算结果较为一致;当拉速变化时,铸坯表面温度可以保证在较小的范围内波动.采用不同的轻压下参数进行生产试验,并通过铸坯低倍检验和中心偏析分析,对压下量和压下位置进行了优化,得出固相率(fs)0.2～0.5、单位压下量1.2mm.m-1为本铸机最佳的轻压下参数.
In order to ensure the improvement of the internal quality of continuous casting slab, a complete soft reduction model was developed, including the solidification heat transfer, the second cooling water dynamic control and the roll gap control model. The key parameters of dynamic soft reduction technology The model was verified by the nailing experiment and the measurement of the slab surface temperature.The experimental results are in good agreement with the model calculation results.The slab surface temperature can be guaranteed to fluctuate within a small range when the casting speed changes. Different soft reduction parameters were used for the production test. Through the analysis of slab low magnification and center segregation analysis, the reduction and depressing position were optimized, and the solid fraction (fs) was 0.2 ~ 0.5. The unit pressure The amount of 1.2mm.m-1 for the caster optimal soft reduction parameters.