粗轧板坯镰刀弯评价系统及因素分析
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摘要
热轧带钢镰刀弯大小是评价产品质量好坏的重要指标之一,而粗轧中间坯镰刀弯状态直接决定了产品镰刀弯程度。针对梅钢1780热轧产线缺少镰刀弯评价的现状,开发了粗轧板坯镰刀弯评价系统,该系统可客观定量地评价粗轧中间坯的板形质量。通过对比试验定量验证了垂直辊系间隙精度、辊面氧化膜均匀性、阶梯垫表面清洁度等因素对粗轧板坯镰刀弯存在显著影响,通过对这些因素的改进,使粗轧板形得到明显改善,头部中心偏移最大值小于40 mm块数命中率从45%提升至75%。
The degree of camber of hot rolled strip is one of the most important indexes to evaluate the quality of products,and the condition of camber of rough rolling transfer bar directly determines the degree of camber of products. Aiming at the lack of camber evaluation system in a 1 780 mm hot rolling plant,an online evaluation system for R2 camber is developed,which can objectively and quantitatively evaluate the R2 shape. Some factors have significant effects on R2 shape,such as clearance of vertical roll system,the uniformity of oxide film on work roll surface,cleanliness of step plate,etcs,which was verified by comparative tests. R2 shape was improved by optimized these factors. The hit rate for coils of the maximum centerline of headend less than 40 mm was raised from 45% to 75%.In addition,the non-main influencing factors such as roughing pass mode,E2-R2 continuous rolling relationship,R2 impact compensation speed,R2 rolling speed,R2 working roll cooling water and so on were excluded. The direction for the subsequent R2 shape improvement was defined.
The degree of camber of hot rolled strip is one of the most important indexes to evaluate the quality of products,and the condition of camber of rough rolling transfer bar directly determines the degree of camber of products. Aiming at the lack of camber evaluation system in a 1 780 mm hot rolling plant,an online evaluation system for R2 camber is developed,which can objectively and quantitatively evaluate the R2 shape. Some factors have significant effects on R2 shape,such as clearance of vertical roll system,the uniformity of oxide film on work roll surface,cleanliness of step plate,etcs,which was verified by comparative tests. R2 shape was improved by optimized these factors. The hit rate for coils of the maximum centerline of headend less than 40 mm was raised from 45% to 75%.In addition,the non-main influencing factors such as roughing pass mode,E2-R2 continuous rolling relationship,R2 impact compensation speed,R2 rolling speed,R2 working roll cooling water and so on were excluded. The direction for the subsequent R2 shape improvement was defined.
引文
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[2]杨辉.在线钢板镰刀弯自动检测系统[J].冶金自动化,2016,40(6):54.
[3]徐冬,杨荃,王晓晨,等.基于机器视觉的热轧中间坯镰刀弯在线检测系统[J].中南大学学报:自然科学版,2018,49(7):1657.
[4]LEE J,CHOI Y J. Development of camber and steering control system in hot strip mill[C]//Proceedings of the2014 IEEE Emerging Technology and Factory Automation. Barcelona:IEEE,2014:1.
[5]HLOBIL H,NIEL K,PRINZ M,et al. Camber measurement at hot strip mill at voestalpine by using image processing method[C]//Machine Vision Applications in Industrial Inspection XIII. San Diego:SPIE,2005:140.
[6]王海玉,杨荃,王晓晨.粗轧板坯镰刀弯控制模型的研究与应用[J].工程科学学报,2017,39(2):294.
[7]王海玉,杨荃,王晓晨,等.粗轧中间坯走偏对镰刀弯的影响分析和控制[J].钢铁,2014,49(8):59.
[8]王建功.热轧粗轧镰刀弯工艺控制技术研究.矿冶[J]. 2013,22(S1):95.
[9]张建华,高文刚.热轧镰刀弯产生原因分析及控制措施[J].金属世界,2013(5):47.
[10]MONTAGUE R J,WATTON J. Centre-line deviation as a measure of camber in steel slabs during unrestricted horizontal rolling[J]. Mechanical Engineering Science,2005,219(8):775.