多辊轧机在纯钛轧制中的应用

针对纯钛的变形特点和对冷轧机的基本要求，介绍了各类多辊轧机的结构、性能特点．指出六辊轧机、森吉米尔轧机和SUNDWIG四立柱式轧机是适合纯钛轧制的机型。     

Spatial vibration characteristics of six-high cold strip rolling mills

The vibration characteristic technical indexes of six-high cold strip rolling mills are not given, and thus the chatter vibrations cannot be predicted and prevented. The strip rolling mills can be divided into the non-statically determinate and statically determinate mills according to the statically determinate theory of mechanism. This statically determinate characteristic of the mill does not be distinguished in the traditional mill vibration analysis. In this paper, for these two distinct mill configurations, a complete spatial vibration characteristic analysis involving six degree of horizontal, vertical, axial, torsional, cross and swinging vibration will be presented based on the modified multi-body Riccati transfer matrix method. The results demonstrate that the vibration characteristics of the statically determinate mills are much better that that of nonstatically determinate ones, which significantly indicates the perniciousness of the offset distance and uncontrolled side clearance, and clarifies the necessity of upgrading of the traditional mills.     

SINAMICS—the high efficiency drive technology for rolling mills

In the Metals Industry,interruption-free processes to produce high-quality end products are a prerequisite. The main drives together with the mill stands play a key role in the success of rolling mills.The crucial demands placed on the drive system are:high-dynamic performance of drive and its control system,ability to handle the process related overloads,smooth running,high availability,high efficiency,easy serviceability and ability to integrate seamlessly with the automation systems.With numerous reference installations and many years of experience Siemens VAI has the wider expertise and the portfolio to provide the right drive for every application. This paper examines the latest innovation,SINAMICS drive technology,for both new drive applications as well as for modernizing the existing drives in rolling mill applications like hot strips mills,plate mills,cold rolling mills,and long rolling mills.     

Grinding Mill Operation and Scale-up: Theory and Equations

Current scale-up equations are discussed critically. The ratio: rotational mass flow of media to axial mass flow of ore—a concept recently introduced—has been refined and extended. It can account for similar breakage in scaled mills by the trade-off between ore/media encounter frequency and average impact energy with specific energy constant. Further consequences are that in scaled mills the average number of revolutions during the residence of an element of ore in the mill, and ore flow path tortuosity, both decrease strongly while axial flow increases very strongly as mill diameter increases. These factors can result in capacity limitations when mill diameters reach a critical range, especially for coarser feed sizes of certain ores. Autogenous mills can operate satisfactorily at relatively large diameters because their large active volumes are occupied either completely or mostly by ore, resulting in higher values of nominal residence time and flow path tortuosity.     

无芯轴热卷箱技术及其在不锈钢热轧生产中的应用

文中简述了热卷箱技术在热轧带钢生产中的发展历史,重点介绍了热卷箱的主要设备组成和工作原理,同时对热卷箱减少中间坯温降、恒速轧制、缩短粗轧机与精轧机之间距离、提高带钢成材率和改善产品质量等技术特点进行了论述;同时结合国内2250mm不锈钢热轧带钢轧机实际生产情况分析了新式无芯轴热卷箱在不锈钢极限规格生产、薄规格轧制稳定性、产品边部和表面质量改善等方面的积极作用。     

炉卷轧机生产线轧机分布形式分析

分析了多种不同炉卷轧机的生产工艺模式;得出了根据市场需求且考虑轧机技术发展和生产均衡性而在多种机型中选用合适轧机机型模式的结论;提出了一种炉卷轧机最佳生产工艺方案。为炉卷轧机的设计和生产选型提供了依据。     

Spatial Vibration and Its Numerical Analytical Method of Four-high Rolling Mills

The rolls in contemporary four-high mills cannot be maintained parallel during the rolling process. There- fore, four-high rolling mill vibrations take place in six degree of freedom （DOF） leading to spatial behaviors invol- ving vertical, horizontal, axial, torsional, cross and swinging vibration modes resulting in complex relative motions between the rolls. Two numerical methods, modified Riccati-transfer matrix method （Riccati-TMM） and finite ele- ment method （FEM）, are presented to analyze a spatial vibration characteristic of two four-high rolling mills with different stability. The natural frequency and mode shape of four-high rolling mills are obtained, and the clearance has a great effect on natural frequency and mode shape. In addition, field testing experiment is also conducted to measure natural frequency by power spectrum analysis of rolling mill vibration. Experimental results basically agree with those calculated by Riccati-TMM and FEM, which means that the Riccati-TMM and the FEM can be used for analysis of spatial vibration of four-high rolling mill. Meanwhile, the spatial vibration shows more compound vibra- tion behaviors and the negative effect of horizontal, vertical, cross and swinging vibration modes are effectively con- trolled after redesign of rolling mill. These advantages have a great significance for the rolling mill to be operated with a much higher rolling speed and improved yield of products.     

用幂函数建立张力减径机工作机组减径率分配通式

有关张力减径机减经分配目前尚没有一种统一的方法，提出的用幂函数建立的张力减径机减径率分配通式及其计算方法可适用于各种张力减径机。只要选择不同的幂指数值，即可获得不同分配规律的减径率计算公式。其中幂指数ｎ〉１的非线性分配规律，适用于多机困大减径量的张力减径机。     

无孔型轧制技术的开发与应用

通过3#轧机浅槽轧制试验,找出金属流动规律,依照规律进行粗轧无孔型轧制试验;建立箱形轧件扭转参数的数学模型,在7#、8#机组进行无孔型扭转轧制试验。试验成功后,相继在粗、中轧机组应用,采用无孔型轧制后,轧辊寿命提高约2～3倍,电耗降低约7%,年产生经济效益约1 200万元。     

Effective broaching in mills of different design

Helical broaching mills used in the production of large-diameter pipe with variable dimensions of the blank (sleeve) are considered. The influence of the type of mill on the cyclic shape change is discussed, taking account of the supply angle. Recommendations are made regarding the readjustment of the mills and optimal broaching conditions for different purposes.     

Features of Implementing Thermomechanical Rolling in Various Types of Mills

Metallurgist - Features of thermo-mechanical rolling in various types of rolling mills are studied: plate mill (continuous, semicontinuous), Steckel mill, and a casting and rolling complex with a...     

轧机扭振控制策略与实施(上)

扭振是轧机普遍存在的问题，也是轧机改造中的一个关键问题。轧机在改造后因输出功率和转矩增加，系统动态性能的提高，扭振将为得非常严重。本文结合攀钢1450轧机改造工程，阐述和分析了轧机扭振的计算和抑制方法。     

宝钢2050热带钢连轧机主传动系统的扭振分析

针对宝钢2050热带钢F1连轧机主传动系统扭振动态特性,进行了现场实测和理论计算,求出了轧机的固有频率和扭矩放大倍数,并得出相应的结论,为解决轧机的振动问题提供了理论依据。     

基于小波和小波分形的冷连轧机振动识别方法

针对2180 mm冷连轧机振纹现象的随机性和隐蔽性的特点,基于小波分析和分形理论,系统地研究了能够准确地识别轧机振动的方法.对典型工况下轧机振动信号的分析结果显示,两种方法均能有效地识别轧机振动的现象,为在复杂振动环境下识别振纹振动提供了有效途径,这对于实时监测轧机的运行状况,避免恶性生产事故的发生,进而实现预知轧机振动具有积极的现实意义.      

Upgrading existing plate mills for higher strength product

Abstract

Older plate-making mills face a real challenge from the trend towards higher strength. Plate mills make an excellent case study for the issues in upgrading mills generally. The forces generated in plate rolling are extreme, as are the demands placed on the equipment and its process control. It is not only the strength increase that compromises older plant, however. A whole range of applications quality standards go along with the exploitation of the additional strength of modern steel grades. The challenge, therefore, is not limited to increasing the power, torque and load limits of the mill stand; ancillary process areas sometimes generate the best return in a modernisation project. Common examples include improvements in post-rolling cooling, levelling and shear-line operations. The potential of state-of-the-art automation, including model-based control, of the plate mill is also discussed. The steel industry is not very sympathetic towards yesterday's plant designers, often blaming them for assets that underperform when processing new steel grades. But is today's generation of plant designers doing any better? In conclusion, we ask whether, in the long view, the aim should be to develop the future-proofed plate mill, and what such a mill might look like.     

用于冷轧不锈钢板的多辊可逆式轧机

介绍了目前广泛用于不锈钢板冷轧的 1 2辊轧机、整体式 2 0辊轧机和分体式 2 0辊轧机。并对这几种类型轧机的辊系特征、板形控制手段及有关调整方式进行了分析和比较     

新时代10年我国电工钢及20辊轧机发展研究

新时代10年我国20辊轧机技术进步很快,关键部件有了突破性进展。为客观分析国产轧机这十年的发展情况,及与国外轧机的优劣势对比,重点介绍了国外20辊轧机在中国的应用情况、10年间我国电工钢产量和质量的变化及20辊轧机的发展情况,并对20辊轧机的主要特点及关键指标进行分析,同时就现阶段我国国产20辊轧机性能与进口同类机型进行了比较分析。     

球磨机反转可行性分析

我厂现用的球磨机都是一个方向旋转。当大齿轮单面使用周期到后,需要翻面,这就需要停磨3～4天,且检修工作量也大。若使球磨机反转,就可以直接使用大齿轮的另一面。本文通过对小轴承座.大瓦等部位的受力分析,从理论方面对球磨机的反转可行性进行了分析。