中厚板轧机组合式机架的性能分析

机架是整个轧机的重要组成部分,分析了整体式机架和组合式机架的特点。利用有限元软件ANSYS对组合式机架进行了有限元仿真计算,并进行了不同预紧力的影响和机架承载的应力应变分析;根据有限元仿真分析结果得出了组合机架的最佳预紧力范围和组合机架的薄弱环节,并对整体式机架和组合式机架在同等载荷下的应力应变进行了对比分析,证明了在工作中两者可以相互替代。     

1580线E2轧机机架辊改进实践

针对E2轧机机架辊频繁损坏现象,对机架辊轴承座和干油泵进行了改进,重新设计了机架辊独立润滑系统和机架辊挡水装置,使机架辊使用寿命提高了2倍。     

框架式矫直机嵌入式预应力机架设计

提出了一种全新的框式矫直机机架的设计方法,在框架式矫直机机架设计过程中采用应力套作为机架定位基准,改变了以立柱为机架定位基准的传统方式,其目的在于更好的提高框架式矫直机机架的整体刚度和稳定性,使机架处于短应力线受力状态,有效的降低机架和立柱的变形量。     

预应力宽厚板轧机机架的设计与制造

国内外特大宽厚板轧机机架有两种结构,即整体式机架和组合式机架。通过对整体式机架和组合式机架的结构、制造难度和使用状况的比较分析后,引入了预应力机架的设计思想,并对预应力机架的可行性进行了分析,对机架的结构形式、制造方法等方面进行了论述。由于重型预应力机架为分块式结构,制造的难度也随之降低,零件质量容易得到保证,制造周期也会因单件重量降低而大大缩短,更加符合重型机械制造低碳化的发展趋势。     

轧钢机机架设计研究

本文主要对轧钢机机架强度进行综合研究。文中以有限元法及光弹测试方法对某厂轧钢机机架进行了计算、测定,精确地得到了机架各部位的应力值,找出了薄弱环节。其结果与现场使用情况相符。 为改进机架设计,文中以最优化方法(采用SUMT法)对机架进行优化设计,得到最优参数的新机架,新机架不仅刚度好、重量轻,同时也降低了危险点(机架转角处)应力,这证明新设计的机架是可取的。     

轧机AGC油缸试验台加载机架结构优化设计

根据加载机架工作特点和机架强度分析计算的结果,提出了改造设计方案;运用优化设计方法对改造设计进行了优化;并用解析法和有限单元法对改造设计的机架进行了验证分析.发现优化后机架的性能优于原机架的性能.     

热轧飞剪机架强度分析及改进措施研究

针对某热轧厂切头飞剪机架产生裂纹的问题,利用有限元软件对机架进行应力场分析,并与实际的应力测量数据进行对比,得到了飞剪机架应力分布趋势与机架薄弱环节,找出了产生裂纹的原因是疲劳损伤。对该厂飞剪机架提出可行性改进建议,利用有限元软件进行了改进后的验证,实现飞剪机架结构的优化。     

轧管机主机机架的分体设计

由于大规格轧管机主机机架重量重、尺寸大、结构复杂和制造困难等问题,提出了分体机架结构形式,这类机架由整体机架改为分体机架,可以降低制造成本,缩短生产周期。     

三辊楔横轧机机架结构参数的研究

本文用有限元法计算并分析了三辊楔横轧机机架的应力,得出了机架各部位的应力状态及应力值,绘制了典型断面及机架外廓的主应力图。针对机架应力集中严重部位,对其结构与参数作了研究,找出了合理的结构参数值,为机架的改造和设计提供了理论依据。     

宝钢1580热轧SP定宽压力机机架在线修复

对宝钢1580热轧SP定宽压力机机架在线修复的成功实施进行了阐述及总结,根据机架本身设计特点,通过计算机仿真,模拟了机架受力分布和机架在线加工过程,并成功进行了在线修复,为轧钢行业同类型机架在线修复提供一定的技术支持与积累,供轧钢行业借鉴。     

Simulation of thermal history of work rolls of finishing stand in hot strip mill: a numerical approach

Abstract

The work rolls in the finishing stands of any hot strip mill (HSM) experiences thermal shock owing to changes in temperature from initial boundary conditions. The thermal expansion owing to the change of temperature is a major contributing factor to the final shape or the profile of the strip generated at different stands of finishing stands of the HSM. A mathematical model has been developed for the prediction of temperature profile for the surface and the inner depth of the roll in the finishing stand of a HSM. The numerical result from the model calculates the temperature profile in each stand of six finishing stands of the HSM and the corresponding thermal expansion at different stands. The temperature profile and the thermal expansion of the work rolls for a complete rolling schedule have been found from this model. The measurement of the thermal expansion has been found to match closely with the calculated one.     

Optimizing the Drying and High-Temperature Heating of the Lining of Steel-Pouring Ladles

This article describes the characteristics of the equipment of stands designed to dry the lining of steel-pouring ladles in shops at the West Siberian Metallurigical Combine. The equipment makes such stands more efficient and lowers fuel consumption. Specialists at the combine have designed a stand for heating the ladle lining to 1100–1200°C and have installed it in converter shop No. 2. Regimes have been developed for the drying and high-temperature heating of ladles on two vertical stands designed by the company American Combustion. The stands have an automated process control system. Drying and high-temperature heating regimes have also been developed for a newly rebuilt horizontal stand.     

Research and Application of Flat Roll Technology in the Downstream Stands for CSP

  CVC mills are generally used in the whole stands of CSP (Compact Strip Product). Their special “s” curve of work roll contour and shifting strategy aimed at controlling strip shape, and the characteristics of continuous casting and rolling production, which make the work roll wear in downstream stands seriously uneven, and easily form abnormal transverse profile at the rolling end. As a result, CVC mill configuration in the downstream stands can not meet the profile and flatness control requirement for schedule free rolling, and bring some difficulties in profile and flatness control for the subsequent cold rolling. Based on the characteristics of the shape control system of CSP production line, and combined with the theory of flat roll technology, a kind of technology solution of using flat roll in the downsteam stands for CSP hot strip mills was proposed. At last, industrial test was carried out in the last stand of Masteel CSP, and good results were obtained.     

热轧带钢终轧温度控制数学模型

根据生产现场工艺和设备实际情况，确定了热轧带钢终轧温度的控制策略。基于带钢在机架间温度变化的精确预报模型，通过调节轧制速度或机架问冷却水流量，有效地将带钢温度控制到目标范围内。     

Development and introduction of a technology for continuous rolling on light-section and rod mills with undriven stands

Some results are presented from studies of an unconventional process that employs undriven stands to roll sections. This technology has been put to use on the continuous 250/150-6 light-section/rod mill at the Mittal Stil. Krivoy Rog Metallurgical Plant. The current objectives are to make more efficient use of such stands on the single-strand 250/150-6 light-section/rod mill and to experiment with their use on the two-strand 150-1 rod mill at the plant. It has been found that rolling sections with undriven stands can effectively solve numerous technical problems encountered in the production process.     

1 800 mm CSP轧机板形调控特性分析

 为掌握1 800 mm CSP轧机的板形调控特性,以某1 800 mm CSP轧机为研究对象,建立了不同机架的有限元模型。利用有限元模型分析了不同带钢宽度下的弯辊力与窜辊对带钢板廓的影响,计算出上、中、下游机架的板形调控特性,得出当前中游机架板形调控能力最强,上游次之,下游最弱,并且板形控制能力随着带钢宽度的减小而减小。根据弯辊与窜辊在当前板形控制中所占比例,得出CVC窜辊是当前凸度控制的主要手段。对现场实际窜辊数据进行分析,得出上游机架凸度控制能力不足,中游机架凸度控制能力偏大,同时,通过对不同宽度带钢窜辊数据的分析得出轧制窄带钢时更易出现凸度控制能力不足的情况。现场数据与有限元仿真结果相互验证,研究结论可以为现场的辊形改进提供较好的理论分析基础。     

1780mm生产线上无芯轴隔热屏热卷箱及其功能

一钢公司1780mm热轧生产线在粗轧机和精轧机组之间增设了具有侧向隔热屏的无芯轴的钢卷转移热卷箱.文章主要介绍热卷箱的设备组成、运行方式及其主要功能.使用热卷箱后可以减少中间带坯的头尾以及宽度方向的温降,缩短粗轧至精轧之间距离和降低中间带坯报废的功能,从而提高产品质量和成材率.     

双半径成型时变形量分配对带坯边缘伸长的影响

双半径成型时，焊管坯中心采用变形量平均分配法会使相邻机架间的带坯边缘伸长量不等，并有可能在前几架产生边缘性伸长，经研究发现变形量非平均分配法对均匀机架间的边缘伸长，提高成型质量有明显的优点。     

宝钢1420冷轧机中5/4机架间张力超调原因及对策

宝钢1420冷轧机在轧制汽车板时,5/4机架间经常发生张力超调,张力超调下轧制的带钢占40%以上.造成该张力超调的主要原因是5/4机架间的张力环存在缺陷和4机架中工作辊与中间辊间出现打滑.文章提出了解决张力超调的方法和措施,在实际生产中实施后,处在张力超调下轧制的带钢量从40%以上减少到2%左右.     

宽带钢热连轧机选型配置与板形控制

通过测试并分析机组上游与下游机架对控制性能的不同要求、服役周期内工作辊和支持辊辊形变化及其对板形控制性能的影响,结合1700mm热连轧机进行的现场试验及工程应用实践,提出热轧上游机架应采用凸度控制能力较强的轧机机型,下游机架宜采用长行程窜辊型轧机机型,全机组均可采用强力弯辊和变接触轧制技术提高机组板形控制能力。