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Roll shifting strategy with varying stroke and step in hot strip mill

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Journal of Central South University 2012年第5期19卷 1226-1233页

作者：李维刚刘相华郭朝晖黄建平 College of Information Science and Engineering Northeastern University Automation Division Baosteel Research InstituteBaoshan Iron&Steel Co.Ltd. Research Institute of Science and Technology Northeastern University hot strip mill Plant Baoshan Iron&Steel Co.Ltd.

A new roll shifting strategy with varying stroke and varying step was investigated,Two characteristic parameters including cat ear height and gap contour smoothness were introduced to assess the effect of shifting strategy on roll wear,and the relation between characteristic parameters and shifting strategy was *** varying stroke and varying step can reduce cat ear height and gap contour smoothness,so the shifting strategy with varying stroke and varying step is better than the one with either varying stroke or varying step,Based on the effect of shifting control parameters on characteristic parameters of roll wear,the selection principle of these shifting control parameters was gained.A case study was conducted to validate the proposed roll shifting strategy,reducing uncontrollable quartic loading gap contour,improving strip profile and extending rolling length of a rolling campaign.

关键词：行程轧带轧机特征参数轧辊磨损控制参数滚动运动钢

Fuzzy C-means Rule Generation for Fuzzy Entry Temperature Prediction in a hot strip mill

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Journal of Iron and Steel Research(International) 2016年第2期23卷 116-123页

作者： Jose Angel BARRIOS Cesar VILLANUEVA Alberto CAVAZOS Rafael COLAS Mechanical and Electrical Engineering Faculty Autonomous University of Nuevo LeonSan Nicolas de los Garza 66451Nuevo LeonMexico hot Rolling Department Ternium ChurubuscoMonterrey 64000Nuevo LeonMexico

Variable estimation for finishing mill set-up in hot rolling is greatly affected by measurement uncertainties, variations in the incoming bar conditions and product changes. The fuzzy C-means algorithm was evaluated for rule base generation for fuzzy and fuzzy grey-box temperature estimation. Experimental data were collected from a real- life mill and three different sets were randomly drawn. The first set was used for rule-generation, the second set was used for training those systems with learning capabilities, while the third one was used for validation. The perform- ance of the developed systems was evaluated by five performance measures applied over the prediction error with the validation set and was compared with that of the empirical rule-base fuzzy systems and the physical model used in plant. The results show that the fuzzy C-means generated rule-bases improve temperature estimation; however, the best results are obtained when fuzzy C-means algorithm, grey-box modeling and learning functions are combined. Application of fuzzy C-means rule generation brings improvement on performance of up to 72%.

关键词： gray-box modeling ANFIS hot rolling temperature estimation fuzzy C-means rule base generation

Comprehensive Shape Control Technology for CSP hot strip mills

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International Journal of Automation and computing 2015年第6期12卷 611-619页

作者： Chao-Chao Chen Jian Shao An-Rui He Nan-Feng Zhang National Engineering Research Center for Advanced Rolling Technology University of Science and Technology Beijing CSP hot strip mill Hunan Valin Lianyuan Iron & Steel Co. Ltd

With the increasing demand on higher strip quality, the profile and flatness of hot rolling strips have become subjects of concern, particularly for compact strip product(CSP) hot strip mills. Based on the roll contour, control model, and rolling process, a comprehensive shape control technology is proposed and applied to CSP hot strip mill of Lianyuan steel, which includes optimization and design of the work roll contour and varying contact back-up roll(VCR) plus backup roll contour, analysis of the flatness feedback control model, as well as improvement of the rolling process control system. The application of the technology has significantly improved the shape control performance. The roll wear is improved and the general roll consumption of the finishing mill is reduced by 29.86%.The percentages that satisfy the control target ranges of the average strip flatness and crown are increased by approximately 15.40%and 14.82%, respectively. The rejection rate of grade Q235 due to shape quality problem is reduced monthly by 39.69%, which creates significant economic benefits for the plant.

关键词： Compact strip product(CSP) hot strip mills roll co

Opti mization and Model of Laminar Cooling Control Systemfor hot strip mills

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Journal of Iron and Steel Research(International) 2006年第1期13卷 18-22页

作者： XIE Hai-bo LIU Xiang-hua WANG Guo-dong ZHANG Zhong-ping State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110004 Liaoning China School of Mechanical Engineering Nanhua University Hengyang 421001 Hunan China hot strip mill Panzhihua Iron and Steel （Group） Co Panzhihua 617062 Sichuan China

The structure of laminar cooling control system for hot rolling was introduced and the control mode, cooling strategy, segment tracking and model recalculation were analyzed. The parameters of air/water cooling models were optimized by regressing the data gathering in situ, and satisfactory effect was obtained. The coiling temperature can be controlled within ±15℃.

关键词： hot rolled strip laminar cooling control system model parameter optimization

PROFILE AND FLATNESS CONTROL SYSTEM IN 1700mm hot strip millS OF ANSTEEL

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Chinese Journal of Mechanical Engineering 2008年第3期21卷 103-107页

作者： HE Anrui YANG Quan CHEN Xianlin ZHAO Lin National Engineering Research Center for Advanced Rolling Technology University of Science and Technology Beijing Beijing 100083 China hot strip Plant Anshan Iron ＆ Steel Group Company Anshan 114021 China

Varying contact-length backup roll and linearly variable crown work roll are provided for improving the mill performance of profile and flatness control. Integrated with theses technologies, relevant profile and flatness control models are developed for hot strip mills on the basis of large amount of finite element calculation. These models include shape setup control model in process control system, bending force feedforward control model, crown feedback control model and flatness feedback control model in basis automation system. Such a profile and flatness control system with full functions is applied in 1 700 mm industrial hot strip mills of Ansteel. Large amount of production data shows that the crown precision with the tolerance of±18 μm is over 90%, the strip percentage which the actual flatness is within ±25 I-unit surpasses 96%, and general roll consume is reduced by 28% by using the profile and fiatness control system. In addition, schedule-free rolling is realized.

关键词： hot strip mills Profile and flamess control Roll contour Schedule-free rolling

Mechanism and control of nonuniform phase transformation of microalloyed dual-phase steel during cooling process after hot rolling

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Journal of Iron and Steel Research(International) 2024年第2期31卷 428-441页

作者： Wen-quan Sun Sheng-yi Yong Tie-heng Yuan Chao Liu San-bao Zhou Rui-chun Guo Meng-xia Tang National Engineering Research Center for Advanced Rolling and Intelligent Manufacturing University of Science and Technology BeijingBeijing100083China strip Production Plant Xichang Steel and Vanadium Corporation of Pangang GroupXichang615000SichuanChina

After cooling in the hot rolling process,the metallographic structure of microalloyed dual-phase steel is nonuniform along the rolling direction,while the thickness fluctuation of microalloyed dual-phase steel with a nonuniform metallographic structure will occur during cold *** mechanism of nonuniform phase transformation of microalloyed dual-phase steels was studied during the cooling process after hot rolling,and the nonuniform phase transformation of microalloyed dual-phase steel was regulated during the cooling process after hot rolling through process ***,the empirical equation of phase transformation temperature was measured by a dilatometer considering thermal ***,the phase field and temperature field of laminar cooling process were calculated to provide initial boundary conditions for the finite element *** that,the coupling finite element model of the temperature phase transformation of the strip steel in coiling transportation process was *** simulation results show that the different thermal contact conditions of the microalloyed dual-phase steel during coil transportation lead to uneven cooling of the coil,which leads to nonuniform transformation of the coil along the rolling *** addition,by prolonging the time interval from coiling to unloading,the phenomenon of nonuniform phase transformation of microalloyed dual-phase steel can be effectively *** simulation results are applied to industrial *** application results show that prolonging the time interval from coiling to unloading can effectively improve the nonuniform phase transformation of microalloyed dual-phase steel in the cooling process after hot rolling.

关键词： Microalloyed dual-phase steel Thickness fluctuation Cooling Heat conduction Nonuniform phase transition Finite element method

Development of strip Flatness and Crown Control Model for hot strip mills

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Journal of Iron and Steel Research(International) 2010年第3期17卷 21-27,45页

作者： LI Hai-jun XU Jian-zhong WANG Guo-dong SHI Li-jun XIAO Yong State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110004 Liaoning China China Offshore Oil Engineering Co Ltd Tianjin 300452 China hot strip Plant Ganglu Iron and Steel Group Co Tangshan 064200 Hebei China

The strip flatness and crown control model is the foundation of automatic strip shape control. Considering the metal transverse flows and the inter stand second deformation, the trip flatness and crown control model has been developed, which can be applied to CVC mills and PC mills as well as normal four-high mills. The strip flatness and crown control model has high precision, and has been successfully applied to the automatic strip shape control system reconstruction of Tangshan Ganglu 1 250 mm hot strip plant.

关键词： strip flatness crown automatic strip shape control hot strip influence function method

A novel mechanism fusion data control method for slab camber in hot rolling

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Journal of Iron and Steel Research(International) 2023年第5期30卷 960-970页

作者： Le-bao Song Dong Xu Peng-fei Liu Jin-hang Zhou Hui-qing Yan Jing-dong Li Hai-nan He Hai-jun Yu Xiao-chen Wang Quan Yang National Engineering Technology Research Center of Flat Rolling Equipment University of Science and Technology BeijingBeijing 100083China Xinjiang Joinworld Co. Ltd.Urumqi 830000XinjiangChina 2250 hot strip mill Hunan Lianyuan Iron and Steel Co.Ltd.Loudi 417000HunanChina

For asymmetric plate shape,control over the hot rolling process mainly depends on the subjective judgement and personal experience of the operator as there are great deviations and much instability in hot ***,the intrinsic mechanisms and sensitivity affecting characteristic parameters and variables in the asymmetric rolling process remain ***,a novel mechanism fusion data control method for slab camber in hot rolling using dimensional analysis and data-driven technique was *** approach of dimensional analysis was used to establish a mathematical model and analyse the main parameters affecting the slab camber of the rough ***,the established mathematical model combined with the data-driven techniques was employed to accurately predict the slab bending ***,the superiority and effectiveness of the proposed model were demonstrated by a comparison with three regression ***,the proposed control strategy was successfully applied in a 1580 mm hot rolling industrial *** automatic control results show that the hit rate of slab cambers in different sizes from 10 to 30 mm is improved,and the quality stability of intermediate slab is significantly improved.

关键词： Mechanism model Dimensional analysis Data-driven technique Camber control hot rolling

Modeling and Simulation of Hydraulic Roll Bending System Based on CMAC Neural Network and PID Coupling Control Strategy

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Journal of Iron and Steel Research(International) 2013年第10期20卷 17-22页

作者： JIA Chun-yu SHAN Xiu-ying CUI Yan-cao BAI Tao CUI Fa-jun College of Mechanical Engineering Yanshan University hot strip mill of Jinan Iron and Steel Co. Ltd

The hydraulic roll bending control system usually has the dynamic characteristics of nonlinearity, slow time variance and strong outside interference in the roiling process, so it is difficult to establish a precise mathemati- cal model for control. So, a new method for establishing a hydraulic roll bending control system is put forward by cerebellar model articulation controller （CMAC） neural network and proportional-integral-derivative （PID） coupling control strategy. The non-linear relationship between input and output can be achieved by the concept mapping and the actual mapping of CMAC. The simulation results show that, compared with the conventional PID control algo- rithm, the parallel control algorithm can overcome the influence of parameter change of roll bending system on the control performance, thus improve the anti jamming capability of the system greatly, reduce the dependence of con- trol performance on the accuracy of the analytical model, enhance the tracking performance of hydraulic roll bending loop for the hydraulic and roll bending force and increase system response speed. The results indicate that the CMAC-P1D coupling control strategy for hydraulic roll bending system is effective.

关键词： hydraulic roll bending CMAC neural network PID control genetic algorithm