七机架热连轧机组板形综合控制技术  

Integrated flatness control technology for seven-stand tandem hot strip mill

作　　者：张金飞 么洪勇 李子正 邝霜 白振华 ZHANG Jin-fei;YAO Hong-yong;LI Zi-zheng;KUANG Shuang;BAI Zhen-hua(National Engineering Research Center for Equipment and Technology of Cold Strip Rolling,Yanshan University,Qinhuangdao 066004,Hebei,China;Technical Center,Tangshan Iron and Steel Group Co.,Ltd.,Tangshan 063000,Hebei,China;State Key Laboratory of Metastable Materials Science and Technology,Yanshan University,Qinhuangdao 066004,Hebei,China)

机构地区：[1]燕山大学国家冷轧板带装备及工艺工程技术研究中心,河北秦皇岛066004 [2]唐山钢铁集团有限责任公司技术中心,河北唐山063000 [3]燕山大学亚稳材料制备技术与科学国家重点实验室,河北秦皇岛066004

出　　处：《钢铁》2023年第3期97-103,157,共8页Iron and Steel

基　　金：河北省重大科技成果转化专项资助项目(22281001Z)。

摘　　要：针对七机架热连轧机组机架数量多,轧制工艺复杂,各机架控制能力得不到充分发挥而造成轧件板形出现中浪、边浪以及复合浪等问题,充分考虑七机架热连轧机组设备结构特点,同时结合轧制工艺条件,采用相对长度差法来表示轧件板形值,并以轧机有载辊缝为桥梁,根据辊系弹性变形模型与金属变形模型的耦合关系进行求解,建立热连轧机组板形预报模型。根据工作辊弯辊力和窜辊量对轧件板形可快速调整的特点,结合现场实际生产情况,确定工作辊弯辊力和窜辊量的研究范围,通过板形预报模型定量分析不同工作辊弯辊力和窜辊量情况下轧机有载辊缝凸度和轧件板形的变化过程,得到轧件板形的调控域,在此基础上提出板形综合控制策略。同时为了保证轧件凸度要求和避免轧辊过度磨损,提出各机架轧件出口厚度精度和辊间压力均匀度约束条件,并以各机架轧件板形波动最小为目标函数,对工作辊弯辊力与窜辊量进行综合优化,开发出适合热连轧机组板形综合控制技术。将该技术应用到某2 050热连轧机组生产实践,结果表明,典型规格产品在工作辊弯辊力和窜辊量优化后,轧件在热连轧过程中板形质量明显改善,轧件出口板形由10.5 I改善到4.8 I,现场应用效果良好。In the seven-stand tandem hot strip mill,due to the large number of stands,the complex rolling process and the control capability of each stand cannot be fully exerted,resulting in problems such as medium wave,edge wave and complex wave in the shape of the rolled product.Taking full account of the structural characteristics of the equipment of the seven-stand tandem hot strip mill,combined with the rolling process conditions,the relative length difference method is used to express the shape value of the rolled piece.Taking the loaded roll gap of the rolling mill as a bridge,the coupling relationship between the elastic deformation model of the roll system and the metal deform-ation model is used to solve the problem,and the shape prediction model of the hot strip mill is established.Accord-ing to the characteristics that work roll bending force and roll shifting amount can rapidly adjust the flatness of the rolled piece,and combined with the actual production situation,the research scope of work roll bending force and roll shifting amount is determined.Based on the shape prediction model,the change process of the roll gap crown with load of the rolling mill and the flatness of the rolled piece under the conditions of different work roll bending forces and roll shifting amount is quantitatively analyzed,and the control region of the flatness of the rolled piece is obtained.On this basis,the comprehensive flatness control strategy is proposed.At the same time,in order to en-sure the requirements of the crown of the rolled piece and avoid excessive wear of the rolls,the constraint conditions of the thickness accuracy of the rolled piece outlet and the contact pressure uniformity between rolls of each stand are proposed.Taking the minimum fluctuation of the rolled piece flatness of each stand as the objective function,the bending force and roll shifting amount of the work roll are comprehensively optimized,and the comprehensive flat-ness control technology suitable for the hot strip mill is developed.The technology w

关 键 词：热连轧 有载辊缝 板形控制 弯辊力 窜辊量 

分 类 号：TG333[金属学及工艺—金属压力加工]