摘要
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 to increasing slab percentage of center segregation grade below 1.0 induced by relaxed displacement sensor calibration and labor roll gap accuracy, the accuracy of roll gap before the start of a sequence casts was measured through a multi-functional roll gap measurement instrument and the factors influencing online roll gap accuracy were analyzed. Considering the typical roll gap control system, incorrect offset values of displacement sensors upon cylinders on segments, especially on the solidification crater end zone, was the main reason of poor roll gap accuracy on the soft reduction region. Through strictly implement of offline calibration of displacement sensors, the online roll gap accuracy was highly improved with high precision between the left and right displacement sensors at the segments exit or entrance. Through the application of offline calibration of displacement sensor, the online roll gap deviation could be stably controlled within ± 0.2 mm, resulting in the increasing percentage of center segregation grade below 1.0 from 29.5 % to 92.0 % and eliminating triangular crack defect.
出处
《炼钢》
CAS
北大核心
2016年第2期25-29,共5页
Steelmaking
关键词
板坯连铸
辊缝精度
标定
内部质量
continuous casting slab
roll gap accuracy
calibration
internal quality
