热轧带钢卷取机的卷取过程研究及发展

对热轧带钢卷取机进行了试验研究,分析了卷取良好卷形的机理,将现代热轧带钢卷取机的发展划分为三代,并作了对比,对卷取机的引进与改造提出了参考意见。     

热轧卷取机带钢头部堆钢现象分析

在现代热连轧带钢生产中,带钢卷取机是十分重要的设备。在卷取过程中,可能因设备故障、工艺参数设定不合理、操作失误等造成卷取失败,俗称"卷取机堆钢"。而带钢的头部散卷,在堆钢事故中占比较大。结合长时间的生产和维护实践,本文只对多种头部散卷堆钢原因进行综合分析,并制定相应的措施,从而有效降低头部堆钢发生的几率。     

关于优化卷取机刚度提高卷形合格率的研究

热轧带钢生产线卷取机稳定性在带钢生产过程中起着关键性作用,而助卷辊刚度的水平更是决定卷取机稳定性的一大重要因素,我厂在生产过程中多次出现钢卷心部反松、头部塔形及高强钢助卷辊压不住尾的情况,我们针对这些难题在卷取机芯轴及助卷辊领域展开了相关研究。     

B700分条机组的改造实践

广东西南冷轧厂有一台Ｂ７００型冷轧带钢分条机组，是用于生产２×７００ｍｍ以下冷轧带钢的分条机组。该机组投产后，主要问题是：钢卷在卷取机上卷不紧，或卷取机与圆盘剪机不同步的情况。因而难以保证该机组的正常生产，经常造成故障停车。经分析得知：主要是卷取机与圆盘剪机线速度不一致造成。因为该卷取机为无心卷取，随着钢卷越来越大，钢卷在卷取机上打滑也越来越厉害，这样就造成了该卷取机的一些主要问题。改造的目标是减少分条机组故障停车，提高分条机组的生产能力，降低机组的维护费用。改造措施主要是采用电磁调速电机代替分…     

新颖的热带钢卷取机

热轧带钢厚度增加促成开发踏步控制卷取技术。为此对传统的助卷辊传动机构实施大刀阔斧的改造,并采用电一液伺服控制技术实现助卷辊的初始辊缝调定、予定位和踏步控制,从而诞生了新颖的全液压卷取机。调试实践证明可以用踏步控制方式卷取各种厚度的(包括薄的)带钢,并且踏步方式修改演变。一年多试生产表明新卷取机运行平稳、冲击小、噪声低,卷出的钢卷紧密、齐边,而且不损伤带钢表面。     

太钢热连轧特殊钢卷取的变张力控制

热连轧卷取机的张力控制是带钢卷取控制的核心,如何提高带钢卷形合格率一直是热连轧工序研究的课题。本文结合实际,介绍了热连轧特殊钢卷取变张力控制的思想,在保证卷取带钢张力控制的前提下,实现了头部变张力控制。生产实际表明,在采用该控制模型后,卷形合格率由90.52%提高到98.2%,并改善了冷轧不锈钢的头部板形。     

对太钢热连轧卷取机卷筒扬度的探讨

卷取机是用来将带钢卷取成卷以便贮存和运输的设备,在卷取过程中,由于受各种外力的作用会使卷筒产生弹性变形,为弥补其变形量,安装过程中应在规范允许的范围内使卷筒向上、向后倾斜,以保证卷取机正常工作。     

欧洲最新开发的全液压步控式卷取机

卷取机在带钢生产中处于十分重要的位置。一套热轧带钢设备的优劣,要看它生产出来的带钢的厚度在整个长度范围内是否均匀和有无缺陷。因此,较长时间以来,专家们评价一个热轧带钢厂首先就看它卷取机的功能及其卷取钢卷的质量如何。     

简易冷带有芯涨缩卷筒的设计

在冷带生产中,有芯张力卷取是改善板形、大卷轧制的重要手段。目前,我国中、小型带钢厂,很多采用实心卷筒式卷取机。为便于卸卷,有人在实心轴上设置带有轴向槽口的套筒,由转轴带动套筒收卷带钢。卷取结束,带钢卷连同套筒,一起从转轴卸出。这种卷取方式需要配备一批开槽套筒,以供生产车间的周转     

重卷拉矫机组卷筒结构的改进

<正>1问题的提出冷轧带钢精整线上的卷取机负责将处理后的钢带卷取成卷,其工作状态直接影响着机组的生产效率、产品的质量。卷筒是卷取机中最重要的部分,柳钢冷轧板带厂1号重卷拉矫机组卷筒为斜楔胀缩卷筒,主要由芯轴、扇形块、轴向拉杆、楔形滑块、卷筒轴头、胀缩缸及旋转接头等组成。带钢的卷取动作分两个过程:初始卷取阶段,带头由前方夹送辊驱动,通过转向辊将带     

热轧平整分卷大张力卷取机卷筒设计

介绍了热轧平整分卷机组大张力卷取机的结构及功能,描述了卷筒的设计内容和方法.利用有限元进行设计分析,开发了适应不同带宽和张力的系列化卷筒,满足平整分卷生产线的使用要求.     

冷轧可逆式大张力卷取机研制

介绍了冷轧可逆式大张力卷取机的结构及功能,详细阐述了设备研制的主要内容和方法。到目前为止,已相继研制出卷筒工作直径为Φ510mm、Φ610mm等,可适应不同卷径、不同板宽及不同卷取张力的系列化产品,能满足冷轧生产的各种要求。     

Improved hot and cold rolling of steel strip

The potential for decreasing the end thickness of hot-rolled strip in traditional broad-strip rolling mills is demonstrated. The change in thickness depends on the temperature difference over the length of the hot-rolled intermediate strip. Additional reduction of the rear end of hot-rolled intermediate strip is worthwhile for other reasons. The rolling of thinner rear ends of hot-rolled strip in continuous cold-rolling mills decreases the loss of metal in end trimming.     

基于贝叶斯决策模型的热轧卷筒电机故障诊断

卷筒电机是卷筒的动力来源,对钢卷卷形质量和卷取稳定性有着重要影响。针对热连轧机组卷取工序中卷筒电机的鼠笼条断裂问题,通过从现场采集卷筒电机电流信号,并经过信号截取、滤波、拟合等操作提取出信号特征,利用多元高斯模型进行建模,并基于最小风险的贝叶斯分类算法对其进行故障诊断。试验结果表明,采用最小风险贝叶斯决策模型可以较好地识别卷筒电机的鼠笼条断裂故障,与支持向量机、Fisher等分类器相比,该方法具有较好的分类效果,且通过调节风险系数能够增强对异常样本的捕获能力。     

355 mm热轧窄带钢和翼缘板共线生产分析

分析了355 mm热轧窄带钢生产线共线生产热轧窄带钢和翼缘板的设备特点,工艺流程及控制系统.     

Stress–Strain State of Coiled Steel

In a new mathematical model of the stress–strain state of steel strip in the course of cooling, the nonplanarity, surface roughness, and transverse thickness variation (convexity of the cross section) are taken into account. The stress–strain state of a coil of thin steel sheet has a significant influence on factors such as the temperature distribution in the coil; the scale formation on cooling in the course of hot rolling; the adhesion of adjacent turns in the annealing of cold-rolled strip; and the shape of the coil itself. The mathematical model is based on representation of the coil as individual nested hollow cylinders of finite length. The cylinders are divided into sections over the width. The sum of solutions of the Lame equation for individual sections is shown to converge to the solution for the cylinder as a whole. The model permits calculation of the coil’s stress–strain state, taking account of gap formation between adjacent turns as a result of the transverse variation in strip thickness. The modeling results show how the radial and tangential stress formed in strip winding is distributed within the coil. The model permits calculation of the stress–strain state of the coil in the winding of even strip; in the winding of convex even strip with no tension; in the loose winding of convex even strip with tension less than that in tight winding; in tight winding of even convex strip with the correct tension; and in the winding of convex uneven strip without tension. The decrease in distance between contacting rough surfaces is calculated on the basis of a probabilistic approach. An algorithm is presented for calculation of the coil’s stress–strain state. The result obtained for the stress distribution in the coil is typical for the winding of steel strip. The model is verified for the winding of hot-rolled strip, in terms of the size of the region with tight contact of adjacent turns. The tightness of contact is assessed on the basis of the temper color on the edges of the hot-rolled strip. The discrepancy between the calculated and measured size of the region with tight contact is 3%.     

热轧钢卷边裂的调研

跟踪调查热轧钢卷生产工艺、坯料质量,分析造成柳钢热轧钢卷边裂的原因,制定检验热轧钢卷边裂的原则。     

热连轧带钢断面形状的修正模型及其应用

 为实现热轧带钢断面凸度和局部高点的准确预报,基于模型、传递和遗传等多因素考虑,从轧机承载辊缝对带钢断面形状的传递效应角度出发,建立起热轧带钢断面形状修正模型,定量分析了带钢厚度和压下率等条件对修正系数的影响。数学模型的有效性得到了生产试验验证,不仅提高了带钢断面形状仿真系统的计算精度,而且为热轧带钢断面形状的准确预报与控制提供了重要的技术支持,并将其应用到鞍钢1 580 mm七机架热连轧机的生产实践中,取得了良好的使用效果。     

珠钢薄规格热轧板开发与生产实践

本文简述热轧薄板的市场应用情况，总结了珠钢CSP工艺技术开发和热轧薄板的生产过程及其产品质量情况，并展望热轧薄板生产技术新趋势。     

Microstructure,texture and precipitates of grain-oriented silicon steel produced by thin slab casting and rolling process

A grain-oriented silicon steel strip with AlN as main inhibitor was produced by thin slab casting and rolling (TSCR) process.The microstructure, texture and precipitates of the hot-rolled strip were investigated by use of optical microscope (OM), X-ray diffractometer, transmission electron micro-scope (TEM) and energy dispersive spectroscope (EDS).The result shows that the microstructure and texture exhibit a through-thickness gradient similar to that of the hot-rolled strip produced by con-ventional high-temperature slab-reheating process;the preferred orientation varies from{110}<001>in the surface layer to{001}<110> in the center layer, and the Goss texture with a maximum inten-sity mainly concentrates on the surface layer.In addition, some other texture components, for ex-ample rotated Goss texture, form in the 1/4 thickness layer, which are not observed in the hot-rolled strip produced by conventional high-temperature slab-reheating process.The precipitates in the hot-rolled strip are mainly (Mn,Cu)S and AlN compound particles with dimension of 100-200 nm, and the fine precipitates are significantly less than that in the hot-rolled strip produced by conven-tional high-temperature slab-reheating process.Moreover, the areal density of the fine precipitates in the center layer is more than that in the surface layer.