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针对某厂因辊缝标定偏差引起的辊缝控制精度不理想,铸坯中心偏析1.0级以下比例较低的问题,运用辊缝仪对铸机浇铸前在线辊缝控制精度进行整体检测,分析了实际辊缝与目标辊缝存在偏差的原因。结合铸机辊缝控制系统,指出凝固末端附近扇形段目标辊缝与位移传感器示数补偿值标定不准是轻压下区域辊缝控制精度差的重要原因之一。通过严格执行离线辊缝控制精度的标定程序,板坯连铸在线控制精度得到了明显的改善,可稳定控制在±0.2 mm以内,铸坯内部质量得到明显的提高,中心偏析C类1.0以下级别比例由29.5%提高至92.0%,三角区裂纹消除。
Aiming at the problem that the control precision of the roll gap caused by the deviation of the roll gap is not ideal, the segregation of the center of the slab is lower than 1.0, the roll gap is used to check the accuracy of the online roll gap control before casting, Actual roll gap and target roll gap deviation reasons. Combined with the roll gap control system of the caster, it is pointed out that the calibration of the target roll gap and the displacement sensor in the segment near the solidification end is not one of the important reasons for the poor precision of the roll gap control in the light pressure area. By strictly carrying out the calibration procedure of off-line roll gap control accuracy, the on-line control precision of slab continuous casting has been obviously improved, and the quality can be stably controlled within ± 0.2 mm. The internal quality of slab is obviously improved. The center segregation level C below 1.0 The proportion increased from 29.5% to 92.0%, and the cracks in the triangle area were eliminated.