热轧带钢加密冷却装置的设计及研究

介绍热轧带钢加密冷却装置的主要结构组成、特点、工作原理。     

紊流酸洗工艺的应用

分析热轧带钢氧化铁皮的生成机理,提出减少氧化铁皮的方法。介绍浅槽紊流酸洗工艺,针对酸洗工艺中酸洗循环系统,提出加强酸洗效果的方法。最后介绍酸洗过程中缓蚀剂的应用及洗涤塔喷淋循环水的处理过程。     

热轧变形区润滑条件与板带钢表面质量关系试验研究

为研究热轧变形区润滑条件与轧后板带钢表面质量关系,对热轧变形区润滑机理进行计算分析,设计一种可移动式热轧工艺润滑装置,用于板带钢热轧工艺润滑试验。研究不同热轧变形区润滑条件对轧后板带钢表面粗糙度、氧化膜断面厚度、钢板酸洗后形貌的影响。结果表明:在热轧变形区内,当轧制速度大于2m/s时,热轧油油滴在变形区的停留时间在0.07s以内,远小于油滴着火延迟时间与油滴燃烧需要的时间之和,油水混合液来不及燃烧便已通过变形区,仍为传统的液态润滑形式;采用工艺润滑与无润滑相比,表面粗糙度降低40%左右,氧化膜厚度减少50%以上。通过3D显微镜进一步对酸洗后钢板表面进行观察分析,可以发现热轧变形区润滑能够明显减少钢板表面缺陷,使板带钢轧后表面轧制纹络清晰,表面质量得到显著改善。     

宽幅薄规格热轧带钢纵向屈曲变形行为解析研究

对于宽幅热轧带钢板形控制成套技术,完善的带钢屈曲生成机理是高精度板形控制模型建立的必要前提,也是板形质量改进研究的重要基础。针对目前超薄规格宽幅热轧带钢生产时的浪形问题,研究热轧中常见的纵向屈曲变形行为,建立统一形式的高次三角函数描述复杂多变的带钢纵向屈曲应力场和浪形挠曲模态,同时创新性引入局部系数n描述全宽和局部纵向屈曲浪形。根据弹性薄板小挠度理论的能量原理建立纵向屈曲力学模型,获得热轧带钢纵向屈曲的临界屈曲应力表达式,同时运用ABAQUS有限元软件,对纵向屈曲变形行为进行仿真计算,验证解析模型的正确性。最后结合热轧带钢高温特性,考虑分析不均匀分布的温度场、张应力、局部系数等多因素耦合作用对临界屈曲的影响。该解析模型进一步揭示了热轧带钢高次板形生成机理,并能够快速获得不同纵向屈曲浪形的临界屈曲应力,为宽幅薄规格热轧带钢的板形控制提供理论和数据基础,可应用于热轧带钢在线板形控制系统中。     

热轧中宽带钢层流冷却控制系统的改进

通过对层流冷却控制系统的分析，结合670mm热轧带钢层流冷却装置的实际，提出了一种简单可行的计算机层流冷却自动控制改进方案，可供同类型机组或热轧窄带钢生产线参考。     

热轧带钢更换规格卷取温度分析及其补偿研究

热轧带钢卷取温度是反映热轧带钢性能指标的重要参数之一,介绍了某700 mm热连轧机层流冷却的组成及其工作原理,针对其具体情况,基于实时数据,应用数据挖掘工具,从理论和工艺的角度分析了控冷过程中热轧带钢更换规格温差大问题产生的原因,得出了热轧带钢更换规格的规律,并应用回归统计建立了温度补偿模型,进行了实验研究,实验结果表明,应用数据挖掘技术从立体的现场数据中得出热轧层流冷却控制模型的做法,对提高控冷精度,优化生产工艺具有一定意义。     

卷取机前热输出辊道的改造

针对热轧带钢卷取机前部分热输出辊道存在的钻钢现象进行分析和改造 ,并就其效果进行论证     

热轧带钢表面缺陷在线检测的方法与工业应用

热轧带钢表面的温度高,辐射光强,并且存在着水、氧化铁皮、光照不均等现象,与冷轧带钢的表面存在着很大的差别.将线阵CCD摄像机作为图像采集装置,用绿色激光线光源作照明,通过窄带滤色镜滤除钢板表面的辐射光,从而提高了缺陷对比度.根据热轧带钢表面的特点提出新的缺陷检测与识别算法流程,通过增加4种不同类型的缺陷检测步骤,去除了大量由水、氧化铁皮等造成的伪缺陷,在保证缺陷检出率的同时,减小缺陷的误识率.经在线应用,该方法可以满足在线检测的要求,缺陷的检出率达95%以上,识别率达85%以上.     

提高热轧带钢头尾剪切精度的措施和方法

针对热轧带钢头尾剪切只能定尺切割而无法优化剪切的问题进行了分析,找到了因蒸汽大而导致传感器失真这一主要原因,并通过加装蒸汽吹扫装置和优化轧制工艺的手段,实现了飞剪的优化剪切,提高了带钢头尾剪切精度,有效降低了带钢头尾切废率。     

热轧带钢组织性能预报技术

热轧带钢组织性能预报技术兴起于20世纪70年代,随着钢铁企业的发展,其应用前景非常广阔,受到了国内外众多钢铁企业的重视,然而,该技术的实际应用效果并非很理想。本文对热轧带钢组织性能预报模型建立过程中存在的问题进行了简单的分析,并提出了一些建议性的解决思路,希望能够提高热轧带钢组织性能预报的实际应用效果,为钢铁企业的生产发展做出贡献。     

Control Scheme Using Forward Slip for a Multi-stand Hot Strip Rolling Mill

Forward slip is an important parameter often used in rolling-speed control models for tandem hot strip rolling mills. In a hot strip mill, on-line measurement of strip speed is inherently very difficult. Therefore, for the set-up of the finishing mill, a forward slip model is used to calculate the strip speed from roll circumferential velocity at each mill stand. Due to its complexity, most previous researches have used semi-empirical methods in determining values for the forward slip. Although these investigations may be useful in process design and control, they do not have a theoretical basis. In the present study, a better forward slip model has been developed, which provides for a better set-up and more precise control of the mill. Factors such as neutral point, friction coefficient, width spread, shape of deformation zone in the roll bite are incorporated into the model. Implementation of the new forward slip model for the control of a 7-stand hot strip tandem rolling mill shows significant improvement in roll speed set-up accuracy.     

国内铜板带生产技术与加工装备现状

重点介绍了中色科技所研制开发的铜板带热轧机、铜带坯水平连铸机、铜带粗轧机、铜带精轧机、铜带拉弯矫直机、铜带(酸洗)脱脂清洗机等铜加工设备的技术特点、装机水平及其加工工艺。     

热轧宽带钢自由规程轧制中机型的配置

为了提高自由规程轧制中热连轧机的板形调节能力,提出了热轧宽带钢的机型配置方案。新机型的特点在于轧机的上游机架采用线性变凸度工作辊技术,下游机架使用锥形工作辊技术,全机组采用变接触轧制技术和强力弯辊。生产实绩表明,新机型配置方案使得宽带钢热连轧机板形控制性能大幅提高,能够适应自由规程轧制的需求。     

On the full stand modeling and tension control for the hot strip finishing mill with PID structure

We describe a looper controller design for a hot strip finishing mill in steel plants. The main function of the looper system is to balance the mass flow of the strip by accumulating material in the middle of the stands. Another function is to control the strip tension which influences the width of the strip. To ensure strip quality, it is very important to control the tension of the hot strip finishing mill. However, because there is a mutual interaction between the looper angle and the strip tension, it is difficult to control the looper system. Previous researches examined only the operation of a single stand. But it is not sufficient to examine the operation and effect of whole stands because the operation is wholly interdependent. In this paper, we present a full model of the hot strip finishing mill in order to more effectively control strip tension. We propose several control methods for the full-stand hot strip finishing mill, denoted as conventional PI, PI with cross gain, and coefficient diagram method (CDM) PID control. In the real plants, there are some problems by using higher order controllers such as LQ, LQG and H∞. By comparison, the PID controller is very simple and easy to apply to all real plants. To that end, we present our findings on PID controls and their potential use in the hot strip finishing mill.     

热连轧精轧机下阶梯垫板设计

对热连轧精轧机下阶梯垫板级次设计与应用的相关因素进行分析并建立数学模型,以某1580 mm热连轧机为例,介绍该模型的使用方法.     

650mm热轧窄带钢生产线设备改造

介绍国内某650 mm热轧窄带钢生产线改造项目上的飞剪区、层流冷却区、地下卷取机区机械设备的技术改造。阐述了采用转鼓式飞剪、精轧机后设置层流冷却装置、由卧式全液压四助卷辊卷取机取代传统窄带钢立式卷取机的优越性。     

热带钢平整工艺及设备配置

介绍热带钢平整的作用、工艺及设备组成。并与冷带钢平整设备做比较。     

Neural network model of the profile of hot-rolled strip

The dynamics of shape or profile depends on the several process parameters in a hot strip mill. This research paper presents the prediction of the profile or strip crown generated during rolling in the finishing stands of a hot strip mill with the use of artificial neural network (ANN) by taking into account the operational parameters such as width, thickness, speed, and roll bending, among others. A multi-layer perceptron neural network is trained with a back-propagation algorithm. Verification of the model is made by a comparison of the measured and predicted strip profile. A sensitivity analysis of the contributing factors to the profile variations is also carried out that shows the strip speed as one of the major contributor to the strip profile. A good comparison is found between the measured strip crown with the ANN-predicted crown demonstrating the modeling route as a robust one.     

HAGC系统在热窄带连轧机组上的应用

介绍了用于崎丰272mm窄带热连轧机上的HAGC控制系统的硬件配置及其功能，并对动态设定型AGC和监控AGC的控制算法进行了详细阐述。该项目是国内第一个HAGC系统在窄带热连轧机上的应用实例。     

Genetic based sensorless hybrid intelligent controller for strip loop formation control between inter-stands in hot steel rolling mills

Safe operating environment is essential for all complex industrial processes. The safety issues in steel rolling mill when the hot strip passes through consecutive mill stands have been considered in this paper. Formation of sag in strip is a common problem in the rolling process. The excessive sag can lead to scrap runs and damage to machinery. Conventional controllers for mill actuation system are based on a rolling model. The factors like rise in temperature, aging, wear and tear are not taken into account while designing a conventional controller. Therefore, the conventional controller cannot yield a requisite controlled output. In this paper, a new Genetic-neuro-fuzzy hybrid controller without tension sensor has been proposed to optimize the quantum of excessive sag and reduce it. The performance of the proposed controller has been compared with the performance of fuzzy logic controller, Neuro-fuzzy controller and conventional controller with the help of data collected from the plant. The simulation results depict that the proposed controller has superior performance than the other controllers.