共查询到19条相似文献,搜索用时 62 毫秒
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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。 相似文献
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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。 相似文献
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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。 相似文献
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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。 相似文献
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Sven‐Erik Lundberg 《国际钢铁研究》2007,78(2):160-166
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. 相似文献
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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. 相似文献
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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. 相似文献
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AGC系统中的轧辊偏心问题 总被引:9,自引:1,他引:8
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 相似文献
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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. 相似文献
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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. 相似文献