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Research and Application of Non-symmetrical Roll Bending Control of Cold Rolling Mill

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Chinese Journal of Mechanical Engineering 2012年第1期25卷 122-127页

作者： WANG Pengfei zhang dianhua LI Xu LIU Jiawei WANG Junsheng State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110004China Anshan Iron and Steel Company Anshan 114001China

The existing research of the flatness control for strip cold rolling mainly focuses on the calculation of the optimum adjustment of individual flatness actuator in accordance with the flatness deviation, which can be used for general flatness control. However, it does not work for some special rolling processes, such as the elimination of ultra single side edge-waves and the prevention of strip break due to tilting roll control overshooting. For the purpose of solving these problems, the influences of non-symmetrical work roll bending and intermediate roll bending on flatness control were analyzed by studying efficiencies of them. Moreover, impacts of two kinds of non-symmetrical roll bending control on the pressure distribution between rolls were studied theoretically. A non-symmetrical work roll bending model was developed by theoretical analysis in accordance with practical conditions. The model was applied to the revamp of a 1250 6-H reversible universal crown mill (UCM) cold mill. Theoretical study and practical applications show that the coordination utilization of the non-symmetrical work roll bending control and tilting roll control was effective in flatness control when there appeared bad strip single side edge waves, especially when the incoming strip was with a wedge shape. In addition, the risk of strip break due to tilting control overshooting could be reduced. Furthermore, the non-symmetrical roll bending control can reduce the extent of uneven distribution of pressure between rolls caused by intermediate roll shifting in flatness control and slow down roll wear. The non-symmetrical roll bending control technology has important theoretical and practical significance to better flatness control.

关键词： non-symmetrical roll bending flatness control cold rolling actuator efficiency roll wear strip break

Prediction and Analysis of the Force and Shape Parameters in Variable Gauge Rolling

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Chinese Journal of Mechanical Engineering 2022年第4期35卷 79-92页

作者： Yuanming Liu Zhenhua Wang Tao Wang Jie Sun Xianguang Zheng dianhua zhang Qingxue Huang College of Mechanical and Vehicle Engineering Taiyuan University of TechnologyTaiyuan 030024China Engineering Research Center of Advanced Metal Composites Forming Technology and Equipment Ministry of EducationTaiyuan 030024China TYUT-UOW Joint Research Center Taiyuan University of TechnologyTaiyuan 030024China State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China

Variable gauge rolling is a new process to obtain a plate for which the thickness changes continuously by continuously and dynamically adjusting the roll gap upward and downward in the rolling *** technology is an efective method for producing lightweight,low-cost,and economical ***,variable gauge rolling is an unsteady process,and the changes in the force and deformation parameters are *** this research,based on the minimum energy theory of the variational principle and considering the characteristics of the roll movement and workpiece deformation comprehensively,the internal plastic deformation,friction,shear and tension powers,and the minimum result of the total power functional in upward and downward rolling are obtained with the frst integral and then with a variation of adopting the specifc plastic power and strain rate vector inner *** analytical results of the deformation and force parameters are also established using the variational *** the precision of this model is certifed using the measured values in a medium plate hot rolling plant and the experimental data for Tailor Rolled Blank *** agreement is ***,the variation rule of bite angle,neutral angle,and location neutral points are shown,and the change mechanism of the friction parameter on the stress state efect coefcient is given in variable gauge *** research proposes a new mathematical model for rolling process control that provides a scientifc basis and technical support for obtaining an accurate section shape in variable gauge rolling production.

关键词： Variable gauge rolling Analytical solution Roll separating force Energy method Neutral point

Texture evolution during semicontinuous equal-channel angular extrusion process of interstitial-free steel

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Baosteel Technical Research 2015年第4期9卷 45-51页

作者： YAN Bo JIAO Sihai zhang dianhua State Key Laboratory of Rolling and Automation Northeastern University Research Institute Baoshan Iron & Steel Co.Ltd.

Semicontinuous equal-channel angular extrusion（ SC-ECAE） is a novel severe plastic deformation technique that has been developed to produce ultrafine-grain steels. Instead of external forces being exerted on specimens in the conventional ECAE,driving forces are applied to dies in SC-EACE. The deformation of interstitial-free（ IF） steel w as performed at room temperature,and individual specimens w ere repeatedly processed at various passes. An overall grain size of 0. 55 μm w as achieved after 10 passes. During SC-ECAE,the main textures of IF steel included { 111} ,{ 110} ,{ 112} ,{ 110} ,and { 110} At an early stage,increasing dislocations induce new textures and increase intensity. When the deformation continues,low-angle boundaries are formed betw een dislocation cell bands,w hich cause some dislocation cell bands to change their orientation,and therefore,the intensity of the textures begins to decrease. After more passes,the intensity of textures continues to decrease w ith high-angle boundaries,and the sub-grains in dislocation cell bands continuously increase. The present study reports the evolution of textures during deformation; these w ere examined and characterized using high-resolution electron backscattered diffraction（ EBSD） in a field emission scanning electron microscope. The mechanisms of texture evolution are discussed.

关键词： severe plastic deformation semicontinuous equal-channel angular extrusion interstitial-free steel texture evolution electron backscattered diffraction

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冷轧四辊轧机弹性变形在线模型

中南大学学报（自然科学版） 2017年第6期48卷 1432-1438页

作者：陈树宗彭良贵王力张殿华东北大学轧制技术及连轧自动化国家重点实验室辽宁沈阳110819

为提高轧机弹跳值的计算精度,开发一种四辊轧机弹性变形的在线计算模型,模型中将轧机弹性变形分为辊系弹性变形和轧机牌坊弹性变形;综合考虑各影响因素,设计辊系和轧机牌坊弹性变形的模型结构。基于所设计的模型结构和测试方案,针对某1 ... 详细信息

为提高轧机弹跳值的计算精度,开发一种四辊轧机弹性变形的在线计算模型,模型中将轧机弹性变形分为辊系弹性变形和轧机牌坊弹性变形;综合考虑各影响因素,设计辊系和轧机牌坊弹性变形的模型结构。基于所设计的模型结构和测试方案,针对某1 800 mm单机架可逆冷轧机,采用影响函数法得到支撑辊辊径、工作辊辊径、带钢宽度、轧制力和弯辊力等因素对辊系弹性变形的影响,并建立辊系弹性变形在线模型;通过对轧机的现场测试,回归得到轧机牌坊弹性变形模型中的系数,并应用于该机组中。研究结果表明:采用该模型,辊缝设定值的计算偏差可控制在±0.1 mm以内,表明该模型具有较高的计算精度,满足现场控制要求。

关键词：轧机弹跳辊系弹性变形影响函数法牌坊弹性变形轧机刚度辊缝

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CSP产线全流程负荷分配策略优化

中南大学学报（自然科学版） 2020年第3期51卷 697-703页

作者：陈小睿张殿华马建阳彭文东北大学轧制技术及连轧自动化国家重点实验室辽宁沈阳110819

为了降低热连轧生产能耗,将出炉温度和负荷分配作为优化变量,建立生产能耗目标函数,采用一种参数自学习动态差分进化算法对目标函数进行求解,实现出炉温度和压下负荷分配的最优化。研究结果表明:对于典型规格,与传统的工艺制度相比,能... 详细信息

为了降低热连轧生产能耗,将出炉温度和负荷分配作为优化变量,建立生产能耗目标函数,采用一种参数自学习动态差分进化算法对目标函数进行求解,实现出炉温度和压下负荷分配的最优化。研究结果表明:对于典型规格,与传统的工艺制度相比,能耗降低9%左右,收敛速度快,计算时间能够满足在线使用要求,证明了该方法在线使用的有效性,为现场工艺提供了指导。

关键词：薄板坯连铸连轧(CSP) 出炉温度负荷分配差分进化算法

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热连轧轧制特性分析及轧制力动态锁定策略

中南大学学报（自然科学版） 2017年第6期48卷 1492-1498页

作者：彭文姬亚锋陈树宗张殿华东北大学轧制技术及连轧自动化国家重点实验室辽宁沈阳110819 太原科技大学重型机械教育部工程研究中心山西太原030024

为获得热连轧最优厚度控制策略,进一步提高厚度控制精度,基于轧制特性过程分析,分析轧制过程中辊缝、来料厚度和温度等对出口成品厚度的影响,得到各影响因素的厚度影响系数。针对厚度计AGC和监控AGC存在相互干扰的问题,提出一种动态锁... 详细信息

为获得热连轧最优厚度控制策略,进一步提高厚度控制精度,基于轧制特性过程分析,分析轧制过程中辊缝、来料厚度和温度等对出口成品厚度的影响,得到各影响因素的厚度影响系数。针对厚度计AGC和监控AGC存在相互干扰的问题,提出一种动态锁定轧制力控制策略,并将优化后的厚度策略应用于某热连轧厚度控制系统中。研究结果表明:对于典型规格的带钢,平均厚度偏差在±25μm范围内厚度预测精度可达96.8%以上,偏差在±50μm范围内厚度预测精度可达98.8%以上,优于现场控制要求。

关键词：热连轧动态锁定轧制力策略影响系数监控AGC 厚度计AGC

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基于有限元分析的中间坯温度预报策略

中南大学学报（自然科学版） 2017年第11期48卷 2874-2881页

作者：彭文陈树宗马更生张殿华东北大学轧制技术及连轧自动化国家重点实验室辽宁沈阳110004

在辊道运输过程中,中间坯上、下表面的换热边界条件不同,使表面温降过程存在差异,影响到精轧入口温度的预报,对厚度设定模型的精度也会产生影响。为提高模型精度,采用有限元法对传热过程进行系统分析,基于分析获得轧件辊道停留时间、粗... 详细信息

在辊道运输过程中,中间坯上、下表面的换热边界条件不同,使表面温降过程存在差异,影响到精轧入口温度的预报,对厚度设定模型的精度也会产生影响。为提高模型精度,采用有限元法对传热过程进行系统分析,基于分析获得轧件辊道停留时间、粗轧出口温度及轧件厚度对表面温度的影响规律,进一步通过拟合得到轧件到达精轧入口时表面温度,并对轧件平均温度预报模型进行优化。研究结果表明:优化模型的预测精度能够有效满足实际控制要求。

关键词：热连轧有限元分析对流换热温度预报

边部感应加热过程中的轧件热行为与温度均匀性研究

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机械工程学报 2024年第2期60卷 119-131页

作者：彭文张丽李旭东刘军孙杰张殿华东北大学轧制技术及连轧自动化国家重点实验室沈阳110819 东北大学低碳钢铁前沿技术研究院沈阳110819 首钢集团有限公司技术研究院北京100043 鞍钢集团北京研究院有限公司北京102211

用边部感应加热器提高带材边部温度,改善产品质量是近年来带材生产的新工艺。目前对于边部感应加热过程中带材的温度分布及感应加热后带材的温度均匀性的研究较少。为获得感应加热过程轧件宽向温度的分布规律,利用COMSOL软件建立了C型... 详细信息

用边部感应加热器提高带材边部温度,改善产品质量是近年来带材生产的新工艺。目前对于边部感应加热过程中带材的温度分布及感应加热后带材的温度均匀性的研究较少。为获得感应加热过程轧件宽向温度的分布规律,利用COMSOL软件建立了C型边部感应加热器的电磁-热耦合的有限元模型,系统探讨轧件运动过程中工艺参数变化对电磁场分布、涡流密度及轧件宽向温度分布的影响规律。结果表明,使用边部加热器能够快速补偿边部温降,轧件边部温升与电流频率、电流大小成正比,与轧件厚度和运行速度成反比;为进一步研究感应加热后轧件运行过程中温度变化对温度分布均匀性的影响,用宽向温度标准差对宽向温度分布均匀性进行评价,研究发现边部温度提高有助于减小温度标准差,提升温度分布均匀性,但仍会由于边部过热出现“猫耳状”高温区,在感应加热过程中当边部温度提高约80℃时,精轧入口测温点处的宽向温度分布均匀性最优,温度标准差由13.71℃减小至6.15℃。研究结果能够为运动条件下轧件边部加热工艺的优化提供参考依据。

关键词：热连轧感应加热电磁场温度场温度均匀性

Optimization of Rollgap Self-learning Algorithm in Tandem Hot Rolled Strip Finishing Mill

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Optimization of Rollgap Self-learning Algorithm in Tandem Ho...