2250 mm CVC四辊热轧机轧制带钢金属的横向流动
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摘要
为了提高2 250 mm CVC四辊热轧机板形控制精度,使用非线性有限元软件MSC Marc建立了动态刚性轧辊-弹塑性轧件耦合模型,分析了带钢金属的横向流动规律。为提高精度,采用静态弹性辊系-弹塑性轧件耦合模型得到有载辊缝形状作为动态仿真的初始辊形。分析发现,金属横向流动值随着距轧件中心距离的增大逐渐增大;摩擦力是影响不同厚度间金属横向流动差别的重要因素;金属的横向流动量与压下率、弯辊力、来料凸度以及窜辊量呈线性关系。为了定量分析各因素与横向流动的关系,建立了各因素的影响系数函数,并进行正交试验及方差分析判断交互关系,最后建立插值计算模型,并通过仿真结果验证了其正确性,为相应轧机的在线板形控制提供参考。
To improve the flatness control precision of the 2 250 mm CVC 4-high hot rolling mill,the nonlinear software MSC Marc was used to establish the dynamic rigid roll-elastoplastic strip coupling model. In order to improve the accuracy of the simulation,the shape of the loaded roll gap was calculated with the static elastic rolls-elastoplastic strip coupling model as the initial roll shape of the dynamic simulation. It was found that the metal transverse flow of strips gradually increased with the increasing of the distance from the center of strips by analysis. Friction is an important factor which affects the metal transverse flow among different thicknesses of metal. The metal comprehensive transverse flow of strips was linear with the reduction rate,the roll bending force,the initial strip crown and the work roll shifting.The influence coefficient function of each factor was established for the quantitative analysis and orthogonal experiments were tested to judge their interaction relations through the variance analysis. Finally,an interpolation calculation model of metal transverse flow of strips was established and its correctness was verified by simulation results. An important reference for the online shape control of the corresponding rolling mill is provided.
To improve the flatness control precision of the 2 250 mm CVC 4-high hot rolling mill,the nonlinear software MSC Marc was used to establish the dynamic rigid roll-elastoplastic strip coupling model. In order to improve the accuracy of the simulation,the shape of the loaded roll gap was calculated with the static elastic rolls-elastoplastic strip coupling model as the initial roll shape of the dynamic simulation. It was found that the metal transverse flow of strips gradually increased with the increasing of the distance from the center of strips by analysis. Friction is an important factor which affects the metal transverse flow among different thicknesses of metal. The metal comprehensive transverse flow of strips was linear with the reduction rate,the roll bending force,the initial strip crown and the work roll shifting.The influence coefficient function of each factor was established for the quantitative analysis and orthogonal experiments were tested to judge their interaction relations through the variance analysis. Finally,an interpolation calculation model of metal transverse flow of strips was established and its correctness was verified by simulation results. An important reference for the online shape control of the corresponding rolling mill is provided.
引文
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[14]李洪波,张杰,曹建国,等. CVC热连轧机支持辊不均匀磨损及辊形改进[J].北京科技大学学报,2008,30(5):558.(LI Hong-bo,ZHANG Jie,CAO Jian-guo,et al. Characteristics of backup roll wear contour in a CVC continuous hot rolling mill[J]. Journal of University of Science and Technology Beijing,2008,30(5):558.)
[15]杨光辉,张高尚,张杰,等. 2 180 mm超宽六辊CVC冷轧机SMS-EDC边降控制特性[J].钢铁,2018,53(5):52.(YANG Guang-hui,ZHANG Gao-shang,ZHANG Jie,et al. SMS-EDC edge control characteristics of 2 180 mm super-wide 6-high CVC cold rolling mill[J]. Iron and Steel,2018,53(5):52.)
[2] PENG Xiang-kai,ZHONG Hao,ZHAO Liang,et al. Strip shape modeling and its setup strategy in hot strip mill process[J]. International Journal of Advanced Manufacturing Technology,2014,72(5-8):589.
[3] LI Hai-jun,XU Jian-zhong,WANG Guo-dong,et al. Development of strip flatness and crown control model for hot strip mills[J]. Journal of Iron and Steel Research,International,2010,17(3):21.
[4]武战军,马晓宝,王东城.冷轧带钢来料断面对张应力与出口断面的影响[J].中国冶金,2017,27(4):17.(WU Zhan-jun,MA Xiao-bao,WANG Dong-cheng. Effect of incoming section on cold rolling strip tension stress and delivery section[J]. China Metallurgy,2017,27(4):17.)
[5]孔令坤.数值模拟在极限规格H型钢工艺优化中的应用[J].中国冶金,2017,27(4):21.(KONG Ling-kun. Application of numerical simulation in process optimization of limited specification H-beam[J]. China Metallurgy,2017,27(4):21.)
[6]王晓崇,刘义伦,赵先琼,等.非对称情况下金属出口横向位移函数的求解[J].轧钢,2007,24(6):12.(WANG Xiao-chong,LIU Yi-lun,ZHAO Xian-qiong,et al. Unsymmetrical situation for analyzing the function of metal lateral displacement[J].Steel Rolling,2007,24(6):12.)
[7]杨利坡.板带轧制三维热力藕合条元法研究及仿真系统开发[D].秦皇岛:燕山大学,2006.(YANG Li-po. Research on the Strip Element Method of Three Thermo-Mechanical Coupling of Plate and Strip Rolling and Development of the Simulation System[D]. Qinhuangdao:Yanshan University,2006.)
[8]杨春彦,李忠富,张国柱,等.热连轧粗轧水平辊多道次可逆轧制宽展有限元模拟[J].北京科技大学学报,2011,33(2):227.(YANG Chun-yan,LI Zhong-fu,ZHANG Guo-zhu,et al.FEM simulation on width spread during the multi-pass and reversing process of roughing horizontal rolling for hot strip mills[J]. Journal of University of Science and Technology Beijing,2011,33(2):227.)
[9] Moazeni B,Salimi M. Investigations on relations between shape defects and thickness profile variations in thin flat rolling[J]. The International Journal of Advanced Manufacturing Technology,2015,77(5-8):1315.
[10]柴箫君,张杰,李洪波,等.热轧金属横向流动规律及其对板形的影响[J].工程科学学报,2017,39(12):1859.(CHAI Xiaojun,ZHANG Jie,LI Hong-bo,et al. Transverse flow law of metals and its effect on the shape of a steel strip[J]. Chinese Journal of Engineering,2017,39(12):1859.)
[11]李成伟,王晓晨,杨荃,等.热轧带钢金属横向流动及影响因素[J].北京科技大学学报,2013,35(2):222(LI Cheng-wei,WANG Xiao-chen,YANG Quan,et al. Metal transverse flow and its influence factors of hot rolled strips[J]. Journal of University of Science and Technology Beijing,2013,35(2):222.)
[12] CHEN X L,ZOU J X. A specialzed finite element model for investigating controlling factors affecting behavior of rolls and strip flatness[C]//Proceeding of the 4th International Conference on Steel Rolling. Deauville:British Metal Corporation,1987:41
[13]王连生,杨荃,何安瑞,等.热轧宽带刚厚度及轧制力横向分析的研究[J].钢铁,2011,46(6):55.(WANG Lian-sheng,YANG Quan,HE An-rui,et al. Thickness and transverse distribution of roll pressure for hot-rolled wide strip[J]. Iron and Steel,2011,46(6):55.)
[14]李洪波,张杰,曹建国,等. CVC热连轧机支持辊不均匀磨损及辊形改进[J].北京科技大学学报,2008,30(5):558.(LI Hong-bo,ZHANG Jie,CAO Jian-guo,et al. Characteristics of backup roll wear contour in a CVC continuous hot rolling mill[J]. Journal of University of Science and Technology Beijing,2008,30(5):558.)
[15]杨光辉,张高尚,张杰,等. 2 180 mm超宽六辊CVC冷轧机SMS-EDC边降控制特性[J].钢铁,2018,53(5):52.(YANG Guang-hui,ZHANG Gao-shang,ZHANG Jie,et al. SMS-EDC edge control characteristics of 2 180 mm super-wide 6-high CVC cold rolling mill[J]. Iron and Steel,2018,53(5):52.)