轧辊偏心中轧制力滤波与补偿的一种新方法

论述一种实用的轧辊偏心中轧制力滤波与补偿的新方法，通过检测受轧机影响的那一部分轧制力，可实现厚度AGC的实时在线控制，这可有效地抑制偏心的影响，提高厚度控制精度，文中给出了仿真的结果。     

精轧机组的动态辊缝补偿

介绍精轧机组的动态辊缝补偿值的计算原理及动态辊缝补偿的校正系数和补偿值的计算过程。指出实时修正校正系数，有效地提高了成品的厚度精度。     

轧制力对辊缝形状影响分析

采用有限元法建立1450 mm四辊轧平整机辊系变形模型,计算出轧制力变化对轧辊辊缝形状的影响.结果表明,轧制力对辊缝形状是有影响规律的,轧制力对辊缝形状成正比变化.     

控制轧制与辊型选择

通过改变辊系辊型(支承辊锥度),控制板型、减少轧制道次、提高轧制节凑,进一步提高控制轧制过程中的道次变形程度,从而提高原料收得率、减少计划外、提高产品的综合性能．     

纯钛冷轧板两辊平整轧制力计算

钛由于具有高强度、密度小、耐腐蚀等优点,被广泛应用于航空航天、石油化工、建筑等领域。本文简述了纯钛板的平整特性,计算纯钛板的平整轧制力,并与普通不锈钢的进行了比较,发现相同规格的纯钛板平整时轧制力低于普通不锈钢的,因此在不锈钢二辊平整机上同时实现钛板的平整是可行的。     

中板轧机轧制力和辊缝检测系统

针对目前国内中板生产的老式轧机缺乏可靠的实时轧制数据、生产完全依赖于经验、缺乏安全性的情况,设计了一套轧机轧制力和辊缝检测系统.通过精确测量和记录生产过程中的实时轧制数据,为现场操作提供参考,也可以通过数据分析了解生产过程和设备状况,并把数据发布上网,以实现全厂范围内的生产数据共享.     

基于相位补偿的轧辊偏心控制

介绍了鞍山钢铁股份集团有限公司(鞍钢)1 700热连轧AGC系统中抑制轧辊偏心扰动的一种有效的方法--CTA轧制力偏心滤波器,分析了其特点及基于相位补偿控制算法的优越性.试验结果表明,通过对剩余偏心成分的补偿分析,进一步调节控制量,有助于提高偏心控制的效果及轧件厚度的精度,并给出了F3机架轧制力实际的滤波效果.     

提高1422mm平整机工作辊轧制周期的研究

热轧平整机在轧制过程中通常遵循带钢轧制宽度从＂宽到窄＂原则,但目前安排精整作业计划时,不可能完全满足＂从宽到窄＂的轧辊使用原则,这样就造成了轧辊更换频率的增加。通过现场实践、论证,适时调整带钢宽度、厚度,提高了平整机工作辊的轧制周期。     

新型液压轧机控制方案的研究

针对板带轧机液压压下控制这一典型的电液位置伺服系统,分析了传统的PID控制方法和新颖的重复控制方法在AGC补偿和偏心补偿中的优缺点,提出了一种基于传统PI控制和嵌入式重复控制的新型复合控制方案,详细分析了系统的结构和重要控制参数的整定.研究结果表明:该控制方案结构简单、易于实现,具有良好的动态和稳态特性,同时实现了板带液压轧机的高效AGC补偿和高精度的偏心补偿.     

轧辊弹性压扁下冷轧轧制力数学模型的研究

在冷轧轧制中,轧辊会发生严重的弹性压扁,对轧制力计算产生影响。考虑轧辊弹性压扁,建立平均单位轧制力数学模型,有重要意义。以卡尔曼单位压力平衡微分方程与采利柯夫解为基础,建立平均单位轧制力数学模型。     

天铁1750mm热轧线粗轧机辊缝标定计算

天铁为了确保1750mm热轧线中间板坯的厚度控制精度,对粗轧机进行辊缝标定和相关的计算,为TCS控制系统提供计算数据。详细地介绍了轧机辊缝标定的内容、过程及相关计算公式。采用该方法将标定过程中测量出的相关数据与TCS控制系统的设定数据相结合,可有效地提高粗轧机中间坯的厚度控制精度,为精轧机组的顺利轧制提供了保障。     

A Model for Prediction of Roll Force and Torque in Edge Rolling

Although edge rolling has been important since the early days of rolling, not until lately, methods for calculation of roll force and torque in edge rolling have been developed. Based on a simple upper bound solution, including plastic flow perpendicular to the rolling direction, a model was derived and arranged to be possible to implement into commercial roll pass design and set up software. Verifications were made in a laboratory rolling mill. Heavy strain hardened copper, and precipitation hardened aluminium were rolled. The calculated forces were in good agreement with the measurements. The developed model has been examined from well documented industrial rolling trials. The relation between the predicted and measured forces, are within 10 % and only in one case of twenty the predicted force deviate more than 15 % from the measured value. No trend indicating different precision as a function of the geometrical conditions has been seen. The experimental scatter is caused by the experimental situation rather than error in the model, which still can be assumed to be in the order of the numerical approximations. The mathematical form of the model is sound, and better predictions of the roll force can be done with the new model compared to older models. By implementation of the new model into any commercial software for rolling analysis, all kinds of roll pass sequences for wire rod and bar rolling can be studied.     

考虑轧辊弹性压扁的冷轧轧制力数学模型研究

在冷轧轧制中轧辊会产生弹性压扁,对轧制力影响较大.本文以卡尔曼单位压力微分方程与采利柯夫解为基础,并考虑轧辊弹性压扁建立的单位轧制压力数学模型,具有一定理论意义和实用价值.     

A 3-D Differential Method for Solving Rolling Force of PC Hot Strip Mill

 According to the character of the deformation zone on pair cross rolls, which is different from the regular 4-high mill, there are longitudinal and transverse two-way shear deformation in the deformation zone, the character of metal particles flowing velocity is more complicated than normal rolling. Comprehensive influences of normal stress and shear stress in rolling direction, width direction and thickness direction are considered. Establish the rolling force calculation model of PC hot strip mills. After the longitudinal and transverse discretization of deformation zone, the longitudinal and transverse distribution of rolling force is worked out by the differential method, then calculate total rolling force. Calculated results are verified by experimental data.     

AGC系统中的轧辊偏心问题

本文介绍本钢热连轧厂引进的ＡＧＣ系统中抑制轧辊偏心扰动的一种有效方法──轧制力偏心滤波器，分析了轧制力偏心滤波器的特点及其控制算法的优越性，并给出实际的滤波效果     

Roll Eccentricity Compensation Based on AntiAliasing Wavelet Analysis Method

 Roll eccentricity is an important factor causing thickness variations during hot strip rolling and might define the limit of strip thickness control accuracy. An improved multi resolution wavelet transform algorithm was proposed to compensate for the roll eccentricity. The wavelet transform method had good localization characteristics in both the time and frequency domains for signal analysis; however, the wavelet method had a frequency aliasing problem owing to the less than ideal cut off frequency characteristics of wavelets. This made its component reconstruction of an inaccurate signal. To eliminate inherent frequency aliases in the wavelet transform, fast Fourier transform (FFT) and inverse fast Fourier transform (IFFT) were combined with the Mallat algorithm. This synthesis was described in detail. Then, the roll eccentricity component was extracted from rolling force signal. An automatic gauge control (AGC) system added with a multi resolution wavelet analyzer was designed. Experimental results showed that the anti aliasing method could greatly restrain the inverse effect of eccentricity and the thickness control accuracy was improved from ±40 μm to ±15 μm.     

Roll Eccentricity Compensation Based on Anti-Alias-sing Wavelet Analysis Method

Roll eccentricity is an important factor causing thickness variations during hot strip rolling and might define the limit of strip thickness control accuracy. An improved multi-resolution wavelet transform algorithm was proposed to compensate for the roll eccentricity. The wavelet transform method had good localization characteristics in both the time and frequency domains for signal analysis; however, the wavelet method had a frequency-aliasing problem owing to the less than ideal cut-off frequency characteristics of wavelets. This made its component reconstruction of an inaccurate signal. To eliminate inherent frequency aliases in the wavelet transform, fast Fourier transform (FFT) and inverse fast Fourier transform (IFFT) were combined with the Mallat algorithm. This synthesis was described in detail. Then, the roll eccentricity component was extracted from rolling force signal. An automatic gauge control (AGC) system added with a multi-resolution wavelet analyzer was designed. Experimental results showed that the anti-aliasing method could greatly restrain the inverse effect of eccentricity and the thickness control accuracy was im-proved from ±40 μm to ±15 μm.