热连轧机轧辊热辊型及冷却制度研究

针对热带钢连轧机由于带钢规格变化(主要指窄料和宽料)导致轧辊热辊型的大幅度波动,对轧辊温度场、热凸度和冷却效应进行了分析。采用有限差分法对轧辊温度场和热凸度进行了数值模拟,计算值和实测值吻合较好。进而应用该模型根据来料规格、压下规程等因素来确定工作辊冷却水轴向分布,为热带钢连轧机工作辊冷却系统的改造提供了可靠依据。     

热带钢精轧机工作辊概况

介绍了热带钢连轧机组精轧机轧辊的材质概况。     

热带钢连轧机工作辊冷却水优化设计

 轧辊热凸度是影响热带钢连轧机负载辊缝的重要因素,高效率的工作辊冷却水系统是生产高质量热轧板带的重要保证。为了设计工作辊的冷却水量及分布,建立了工作辊横断面温度场计算模型、轴对称平面温度场计算模型和热凸度计算模型。在此基础上,采用优化设计方法对1450热带钢连轧机工作辊冷却水量及其沿轧辊周向和轴向的分布进行优化设计。     

热带钢连轧机轧制条件及用辊综述(续)

（上接2002年第2期41页）从图9可以看出高速工具钢（SKH-S）的断裂韧性、耐热冲击性、抗热裂性及耐粘结性均高于高NiCr铸铁（GH-S），而其磨损量仅为高铸铁NiCr的，因此有望取代高复合铸铁轧辊用于热1/5NiCr带钢连轧机精轧工作辊。表是法国生产的两种高速钢轧辊19FORCAST的化学成份，洛林连轧公司年使用这种高速钢1993轧辊在三套热带钢连轧机的不同机架进行了个100辊役的应用[8]，应用机架及轧辊数量如表。20使用结果表明，所有轧辊的磨损量只有原轧辊的，轧辊无剥落，带钢表面质量良好，但有1/3一支用于架轧辊出现尾印问题而增加…     

高镍铬无限冷硬复合铸铁轧辊辊身基体组织选择雏议

1 前言高镍铬无限冷硬复合铸铁轧辊,从三十年代问世以来,广泛应用于热轧带钢连轧机工作辊;五十年代初开始推广应用于宽中厚板轧机工作辊。至目前止,国内外几乎所有热轧带钢连轧机精轧后段工作辊,仍然一直选用高镍铬无限冷硬复合铸铁轧辊;国外3300mm以上的宽中厚板轧辊,特别是精轧机架尽管欧洲开发了高铬铸铁轧辊,但不少厂家沿于操作习惯,仍选用高     

热宽带钢轧机过程模型的新发展

在热宽带钢轧机中，用于控制轧制和冷却过程并使之最佳化的ＡＶＩ设计方案是建立在采用数学模型准确地模拟物理过程及人工智能基础之上的。为了改善轧机的预调整，使用了动态过程模型，以及根据实践掌握的过程参数、对模型参数具有连续的适应性。评估轧机调整的最佳化主要取决于达到带钢厚度、带钢温度、带钢外形和带钢平直度等目标值的轧制策略，其中，也要考究到轧辊热凸度，轧辊磨损、轧辊弯曲和轧辊外形等影响。材料硬度的适应性     

我国热带钢轧机技术概述

叙述了我国热带钢轧机之立辊轧机、调（定）宽压力机、轧机的弯辊装置、轧辊横移轧机、轧辊交叉轧机、热卷箱、轧机布置技术及薄板坯、中薄板坯技术应用和发展情况。     

热带钢轧机轧辊磨损研究

论述了热带钢轧机轧辊磨损的形成机理及磨损分布的基本规律 ,分析了轧辊磨损的影响因素及目前磨损预报模型存在的问题 ,提出了今后轧辊磨损研究工作的建议。     

国产热带钢连轧机主要设备技术分析

分析了我国热带钢连轧机主要设备技术状况 ,国内外技术对比 ,对我国热带钢连轧机的国产化 ,参与国际竞争具有重要作用。     

国产1750mm热带钢连轧机主要设备及技术

分析了首套国产1750 mm热带钢连轧机主要设备技术,对我国热带钢连轧机的技术发展及实现国产化,参与国际竞争具有重要作用.     

降低热轧窄带钢中精轧机轧辊消耗

轧制生产过程中,轧辊始终处于复杂的应力状态中,如果轧辊的材质、加工、生产、操作等工艺不合理,就会出现断辊、爆辊、辊面损伤、裂纹等情况,造成轧辊失效,缩短轧辊寿命,甚至报废。宣钢热带生产线通过技术改造、对轧辊改造再利用、加强管理等措施,降低了轧辊消耗,使轧辊效用达到最大化。     

热轧轧制润滑在珠钢CSP的应用

介绍在珠钢CSP生产线上应用轧制润滑的情况，可以降低轧制力和辊耗，改善带钢表面和板形质量及辊面质量，增加薄规格比例，取得了较好的经济效益。     

过程控制级模拟轧钢系统的研制及在热轧试车中的应用

宝钢集团上海第一钢铁有限公司(后面简称一钢)新建的不锈钢工程1780热轧项目中,为了能在较短周期内完成所有的应用软件开发与测试任务,特别研制了模拟轧钢功能。本论文主要阐述利用计算机的集成思想,结合热轧工艺,来开发模拟轧钢功能,以及利用模拟轧钢进行现场各种情况的模拟测试。     

Three-Dimensional Model for Strip Hot Rolling

Steel stripis widely usedin many fields such asautomobile ,building,transportation and householdappliance ,etc·. Withthei mprovement in productiv-ity and automation of strip processing,the require-ments for crown and flatness of strip have been in-creasingly severe ,and“crown free”steel strips arerequired for some special applications such as for au-tomobile parts andtinplate cans .In order toi mprovethe strip quality , an effective three-di mensionalmodel is needful to further study on the…     

VCR back-up roll and negative work roll contour design for solving roll spalling and transfer bar profile problems in hot strip mill

Abstract

During the first year of production in the 2250 mm hot strip mill of Qian'an Iron and Steel Company of Shougang Steel Corporation, roll spalling and broken rolls were frequent occurrences, especially on the second stand of roughing mill (R2), and resulted in enormous economic losses. In addition, improvements to strip shape were required. One of the factors resulting in strip shape defects after finish rolling is that the transfer bar usually had an unsound profile such as a large wedge, camber or negative crown after roughing rolling. To solve these problems, a variable contact back-up roll contour curve with six order of polynomials and negative crown contour was designed and applied to the back-up roll and work roll of roughing mill stands R1 and R2 instead of a conventional flat roll contour. After the application, roll spalling, crown and wedge quality of the transfer bar and strip quality all improved.     

Analysis of rolling load generated by pair crossed rolling mill

Abstract

Although a pair crossed rolling mill has a very high control capability of strip crown, a frictional force always occurs in the strip width direction between the strip and the work rolls. An analysis of rolling load was carried out, considering the shear deformation of strip cross-section caused by the frictional force. From the examination of the calculated results for a large-scale mill for production, the following conclusions were obtained: (a) the cross angle hardly influences the rolling force and torque, (b) the thrust force on the roll induced by the frictional force decreases as a result of shear deformation, (c) the thrust factor, i.e. the thrust force divided by the rolling force, is little influenced by the strip deformation resistance and the friction coefficient between the work rolls and the strip during hot rolling, (d) the thrust force applied to the rolls during hot rolling is 3–6% of the rolling force for the cross angle of 1° and this is not an obstacle related to the design of rolling mills.     

Roll Wear Evaluation of HSS,HiCr and IC Work Rolls in Hot Strip Mill

While it is acknowledged that roll wear is one of the most challenges to hot strip mills (HSM), very few studies which detail an exact prediction model have been published. The aim of this work is to evaluate and compare two prediction models with measured roll wear. The first prediction model, model 1, developed for a plate mill, was modified to use in strip rolling process. The second prediction model, model 2, is a simplified on‐line model. Data of two hot strip mills were used to investigate the influence of different rolling schedules. The rolls and strip properties were described and the rolling conditions were detailed. The influence of hot rolling factors, such as strip strength, roll grades, rolling temperature, rolling force, reduction and contact length, were also studied. When rolling with different work roll materials and strip grades, the modified prediction model has better prediction accuracy than the simplified model. The accuracy of both models becomes better at higher roll wear > 150 μm. HSS work rolls were confirmed to exhibit improvement of roll wear in comparison with HiCr rolls, the wear resistance was 3 to 4 times better. The influence of strip grade on roll wear was shown to be significant, with higher accuracy of the regression statistics for rolling with similar strip grades and lower regressed accuracy for rolling with mixed strip grades. The roll wear was evaluated at the centre of the barrel.     

热轧薄带轧制稳定性影响因素分析

结合热轧薄带生产的技术特点,对其轧制稳定性影响因素进行了分析,提出了应对措施:采取合理安排轧制计划、提高加热温度、减少除鳞道次、严格控制辊形、提高轧机各支承辊和工作辊装配精度等,可以提高热轧薄带轧制的稳定性。     

基于多目标满意优化的热轧非对称工作辊设计

热轧非对称工作辊可兼顾板形控制和自由规程轧制,其关键参数通常采用经验设计法,缺乏相应的依据.本文提出了热轧非对称工作辊关键参数的理论设计方法.由于设计过程中无法精确给定已知条件,因此把多目标满意优化引入到非对称工作辊的参数设计中,建立了综合满意度目标函数,并用模拟退火遗传算法进行满意度最优值求解.采用满意解代替最优解,使得辊形参数的优化设计结果更具科学性.在某热连轧生产线上的实际应用表明,优化设计的辊形在板形控制和自由规程轧制方面均取得了理想的效果.      

超纯铁素体不锈钢热轧生产控制方法

结合宝钢不锈钢事业部生产不锈钢产品经验,说明了超纯铁素体不锈钢在热轧生产过程中存在的主要质量问题,同时从轧制计划编排、关键工艺控制、轧辊材质使用、设备功能状态等多个角度详细阐述了热轧生产的具体控制要求。着重从解决超纯铁素体不锈钢轧制过程中存在的黏结现象着手,对关键工艺控制点提出了合理的控制范围,并将理论分析与大生产实践经验相结合对其控制原理进行了解释和说明。