轧辊交叉对中间坯镰刀弯生成过程的影响
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摘要
粗轧过程中出现的轧辊两侧轴承间隙差异较大的情况,会造成轧辊交叉,导致板带两侧轧制力失衡,进而引起或加剧中间坯的镰刀弯缺陷,影响最终产品质量精度和后续精轧的轧制稳定性.为研究轧辊交叉对中间坯镰刀弯生成过程的影响,建立了轧辊交叉、偏移的轧件-辊系耦合动态有限元模型,利用模型分析了不同工况条件下,轧辊交叉位置、交叉角度对中间坯楔形、弯曲量及两侧轧制力差的影响,进而总结了由轴承间隙引起的轧辊非对称交叉对中间坯镰刀弯弯曲量的影响规律.结果表明:镰刀弯弯曲量与交叉角、交叉位置比分别呈线性关系,与辊系间隙比呈二次曲线关系.
The shape of a hot rolled strip is a main indicator of its quality,and camber is a significant defect arising from problems in shape quality.Differences in the bearing clearance of the two sides of a rough mill can cause a crossed roller,which leads an imbalance in the rolling force and,thereby,camber.A camber defect adversely affects product quality and the stability of the subsequent finish-rolling production process.The simulation and control of asymmetric shapes is one of the hottest topics in the field of modern strip rolling.To solve this problem and enhance the quality and precision of the strips produced,exploring and analyzing the problem of camber in hot rough rolling is necessary.This study investigated the generation of camber in the 1580 mm roughing mill R2 of a steel plant during the hot-continuous-rolling process.This paper established a three-dimensional elastic-plastic dynamic coupling model of the rolls and slab using the finite element(FE) analysis software ABAQUS/Explicit.In addition,the paper used a data analysis method based on the node-set coordinate output.By balancing the relationship between computational precision and efficiency,the study found the FE model to run stably.Using the proposed model,the paper systematically investigated the influence of cross position and angle on the camber,slab wedge,and amount of rolling force under different conditions.Based on the FE results,the paper then characterized the influence law for the occurrence of a cross roll with respect to bearing clearance and slab camber.Numerical examples demonstrate that the relationship between the camber and cross-angle position is linear,and that between the slab camber and clearance is a quadratic curve.
The shape of a hot rolled strip is a main indicator of its quality,and camber is a significant defect arising from problems in shape quality.Differences in the bearing clearance of the two sides of a rough mill can cause a crossed roller,which leads an imbalance in the rolling force and,thereby,camber.A camber defect adversely affects product quality and the stability of the subsequent finish-rolling production process.The simulation and control of asymmetric shapes is one of the hottest topics in the field of modern strip rolling.To solve this problem and enhance the quality and precision of the strips produced,exploring and analyzing the problem of camber in hot rough rolling is necessary.This study investigated the generation of camber in the 1580 mm roughing mill R2 of a steel plant during the hot-continuous-rolling process.This paper established a three-dimensional elastic-plastic dynamic coupling model of the rolls and slab using the finite element(FE) analysis software ABAQUS/Explicit.In addition,the paper used a data analysis method based on the node-set coordinate output.By balancing the relationship between computational precision and efficiency,the study found the FE model to run stably.Using the proposed model,the paper systematically investigated the influence of cross position and angle on the camber,slab wedge,and amount of rolling force under different conditions.Based on the FE results,the paper then characterized the influence law for the occurrence of a cross roll with respect to bearing clearance and slab camber.Numerical examples demonstrate that the relationship between the camber and cross-angle position is linear,and that between the slab camber and clearance is a quadratic curve.
引文
[1]Kang Y,Jang Y J,Choi Y J,et al.An improved model for camber generation during rough rolling process.ISIJ Int,2015,55(9):1980
[2]Wang X C,He F,Yang Q,et al.Finite element study on the formation regularity of slab cambering at a slab sizing press of hot rolling.J Univ Sci Technol Beijing,2013,35(11):1521(王晓晨,何峰,杨荃,等.热轧定宽压力机板坯侧弯形成规律有限元仿真.北京科技大学学报,2013,35(11):1521)
[3]Zhao X Q,Liu Y L,Fu Z,et al.3-D numerical simulation of aluminum strip steering process under asymmetric variations in hot rolling.J Hunan Univ Nat Sci,2011,38(7):37(赵先琼,刘义伦,付卓,等.非对称扰动下热轧铝带跑偏过程三位数值模拟.湖南大学学报(自然科学版),2011,38(7):37)
[4]Wang G D.Control and Theory of Plate Shape.Beijing:Metallurgical Industry Press,1986(王国栋.板形控制和板形理论.北京:冶金工业出版社,1986)
[5]Hu X L,Wang Z D,Jiao Z J,et al.Influence of bilateral stiffness difference of plate mill on gap-setting.J Iron Steel Res,2003,15(3):14(胡贤磊,王昭东,矫志杰,等.中厚板轧机两侧刚度差异对辊缝设定的影响.钢铁研究学报,2003,15(3):14)
[6]Zhao X M,Liu X H,Wang G D,et al.Influence of asymmetrical technical conditions during roughing on bar cambering.Iron Steel,2003,38(3):25(赵宪明,刘相华,王国栋,等.板坯轧制过程中不对称工艺参数对侧弯的影响.钢铁,2003,38(3):25)
[7]Wang H Y.Study and Application of Asymmetrical Shape Control Model in Rough Rolling of Hot Strip Mills[Dissertation].Beijing:University of Science and Technology Beijing,2015(王海玉.热连轧粗轧非对称板形控制模型研究及应用[学位论文].北京:北京科技大学,2015)
[8]Hol C W J,de Roo J,Kampmeijer L,et al.Model predictive controller for strip-tracking during tail-out of the finishing mill//16th IFAC Symposium on Control,Optimization and Automation in Mining,Minerals and Metal Processing.San Diego,2013:397
[9]Sun J L,Gu S W,Liu H M,et al.Influence of asymmetric rolling parameters on rolling force deviation for heavy plate.J Plast Eng,2016,23(6):94(孙建亮,谷尚武,刘宏民,等.非对称轧制参数对厚板轧制力偏差的影响.塑性工程学报,2016,23(6):94)
[10]He C Y.Study and Application of High Accuracy Camber Control in Plate Rolling[Dissertation].Shenyang:Northeastern University,2009(何纯玉.中厚板轧制过程高精度侧弯控制的研究与应用[学位论文].沈阳:东北大学,2009)
[11]Kainz A,Pumhoessel T,Kurz M,et al.Prediction of camber formation,suppression and control of wedge-shaped hot rolled slabs by analytical concepts and finite elements.IFAC-Papers OnLine,2016,49(20):238
[12]Schausberger F,Steinboeck A,Kugi A.Optimization-based reduction of contour errors of heavy plates in hot rolling.J Process Control,2016,47:150
[13]Schausberger F,Steinboeck A,Kugi A.Mathematical modeling of the contour evolution of heavy plates in hot rolling.Appl Math Modell,2015,39(15):4534
[14]Liu Y,Wang X C,Yang Q,et al.Analysis of shape control performance for intermediate roll shifting of universal crown mill.J Mech Eng,2016,52(4):82(刘洋,王晓晨,杨荃,等.万能凸度轧机中间辊偏移板形调控能力分析.机械工程学报,2016,52(4):82)
[15]Yan J M.Study on Rolling Force Deviation of PC Mill[Dissertation].Qinhuangdao:Yanshan University,2010(闫静敏.PC轧机轧制力偏差研究[学位论文].秦皇岛:燕山大学,2010)
[16]Xu L P,Zhou J,Peng Y.Three-dimensional finite element simulation of PC mill on rolling force.J Yanshan Univ,2010,34(1):13(徐利璞,周骏,彭艳.PC轧机轧制过程轧制力三维有限元模拟.燕山大学学报,2010,34(1):13)
[17]Li C S,Song S N,Mei R B,et al.Online arithmetic by fast finite elment in strip rolling.J Mech Eng,2009,45(6):193(李长生,宋叔尼,梅瑞斌,等.板材轧制过程中快速有限元在线算法.机械工程学报,2009,45(6):193)
[18]Toshikazu S,Haruhiro I,Atsuo M,et al.Relation between camber and wedge in flat rolling under restrictions of lateral movement.ISIJ Int,1991,31(6):583
[19]Wang J.Research and Application of Plate Camber Model and Control Strategy[Dissertation].Shenyang:Northeastern University,2013(王君.中厚板侧弯模型及控制策略的研究与应用[学位论文].沈阳:东北大学,2013)
[2]Wang X C,He F,Yang Q,et al.Finite element study on the formation regularity of slab cambering at a slab sizing press of hot rolling.J Univ Sci Technol Beijing,2013,35(11):1521(王晓晨,何峰,杨荃,等.热轧定宽压力机板坯侧弯形成规律有限元仿真.北京科技大学学报,2013,35(11):1521)
[3]Zhao X Q,Liu Y L,Fu Z,et al.3-D numerical simulation of aluminum strip steering process under asymmetric variations in hot rolling.J Hunan Univ Nat Sci,2011,38(7):37(赵先琼,刘义伦,付卓,等.非对称扰动下热轧铝带跑偏过程三位数值模拟.湖南大学学报(自然科学版),2011,38(7):37)
[4]Wang G D.Control and Theory of Plate Shape.Beijing:Metallurgical Industry Press,1986(王国栋.板形控制和板形理论.北京:冶金工业出版社,1986)
[5]Hu X L,Wang Z D,Jiao Z J,et al.Influence of bilateral stiffness difference of plate mill on gap-setting.J Iron Steel Res,2003,15(3):14(胡贤磊,王昭东,矫志杰,等.中厚板轧机两侧刚度差异对辊缝设定的影响.钢铁研究学报,2003,15(3):14)
[6]Zhao X M,Liu X H,Wang G D,et al.Influence of asymmetrical technical conditions during roughing on bar cambering.Iron Steel,2003,38(3):25(赵宪明,刘相华,王国栋,等.板坯轧制过程中不对称工艺参数对侧弯的影响.钢铁,2003,38(3):25)
[7]Wang H Y.Study and Application of Asymmetrical Shape Control Model in Rough Rolling of Hot Strip Mills[Dissertation].Beijing:University of Science and Technology Beijing,2015(王海玉.热连轧粗轧非对称板形控制模型研究及应用[学位论文].北京:北京科技大学,2015)
[8]Hol C W J,de Roo J,Kampmeijer L,et al.Model predictive controller for strip-tracking during tail-out of the finishing mill//16th IFAC Symposium on Control,Optimization and Automation in Mining,Minerals and Metal Processing.San Diego,2013:397
[9]Sun J L,Gu S W,Liu H M,et al.Influence of asymmetric rolling parameters on rolling force deviation for heavy plate.J Plast Eng,2016,23(6):94(孙建亮,谷尚武,刘宏民,等.非对称轧制参数对厚板轧制力偏差的影响.塑性工程学报,2016,23(6):94)
[10]He C Y.Study and Application of High Accuracy Camber Control in Plate Rolling[Dissertation].Shenyang:Northeastern University,2009(何纯玉.中厚板轧制过程高精度侧弯控制的研究与应用[学位论文].沈阳:东北大学,2009)
[11]Kainz A,Pumhoessel T,Kurz M,et al.Prediction of camber formation,suppression and control of wedge-shaped hot rolled slabs by analytical concepts and finite elements.IFAC-Papers OnLine,2016,49(20):238
[12]Schausberger F,Steinboeck A,Kugi A.Optimization-based reduction of contour errors of heavy plates in hot rolling.J Process Control,2016,47:150
[13]Schausberger F,Steinboeck A,Kugi A.Mathematical modeling of the contour evolution of heavy plates in hot rolling.Appl Math Modell,2015,39(15):4534
[14]Liu Y,Wang X C,Yang Q,et al.Analysis of shape control performance for intermediate roll shifting of universal crown mill.J Mech Eng,2016,52(4):82(刘洋,王晓晨,杨荃,等.万能凸度轧机中间辊偏移板形调控能力分析.机械工程学报,2016,52(4):82)
[15]Yan J M.Study on Rolling Force Deviation of PC Mill[Dissertation].Qinhuangdao:Yanshan University,2010(闫静敏.PC轧机轧制力偏差研究[学位论文].秦皇岛:燕山大学,2010)
[16]Xu L P,Zhou J,Peng Y.Three-dimensional finite element simulation of PC mill on rolling force.J Yanshan Univ,2010,34(1):13(徐利璞,周骏,彭艳.PC轧机轧制过程轧制力三维有限元模拟.燕山大学学报,2010,34(1):13)
[17]Li C S,Song S N,Mei R B,et al.Online arithmetic by fast finite elment in strip rolling.J Mech Eng,2009,45(6):193(李长生,宋叔尼,梅瑞斌,等.板材轧制过程中快速有限元在线算法.机械工程学报,2009,45(6):193)
[18]Toshikazu S,Haruhiro I,Atsuo M,et al.Relation between camber and wedge in flat rolling under restrictions of lateral movement.ISIJ Int,1991,31(6):583
[19]Wang J.Research and Application of Plate Camber Model and Control Strategy[Dissertation].Shenyang:Northeastern University,2013(王君.中厚板侧弯模型及控制策略的研究与应用[学位论文].沈阳:东北大学,2013)