Abstract This paper is concerned with the active compensation of the roll eccentricity-induced periodic disturbances in the strip exit thickness of hot and cold rolling mills. The roll eccentricity may be caused by different reasons like e.g. inexact roll grinding or nonuniform thermal expansion of the rolls.
In order to compensate the roll eccentricity in hot strip rolling process, a multi-resolution wavelet transform method was proposed. This wavelet method has quiet good localization characteristic in both time domain and frequency domain. To eliminate frequency aliases inhered in Mallat algorithm, an anti-aliasing algorithm combining fast Fourier transform (FFT) and inverse fast Fourier ...
Abstract: This paper is concerned with the active compensation of the roll eccentricity-induced periodic disturbances in the strip exit thickness of hot and cold rolling mills. The roll eccentricity may be caused by different reasons, like e.g. inexact roll grinding or nonuniform thermal expansion of the rolls.
Jul 01, 1987· SIMULATION RESULTS In eccentricity control, the following practical considerations apply to production rolling mills and thus should be cons idered in the des ign of relevant simulation studies: • the incoming feed can introduce periodic disturbances in the form of hot rolled thickness disturbances or uncoiler induced tension fluctuations ...
Roll eccentricity control Irregularities in roll geometry cause periodic vari-ations in the roll gap, which can lead to variations in thickness of the rolled product. The function compensates for periodic disturbance from geo-metric asymmetries on the backup rolls. An auto-matic adaptation to compensate changes during rolling, e.g. due to ...
Hot Rolling Mill Roll Eccentricity Crushing. Aggregate Crushing Plant South Africa Stone Crushing Plant Pakistan Sand Production Line 5070th Gold Ore Crushing Production Line in Malaysia 5000th Copper Ore Crushing Production Project in Kenya 500th Iron Ore Crushing Production line in South Africa 250th Granite Crushing Production Line in Zambia 100th Complete Limestone Crushing …
In rolling mill, the accuracy and quality of the strip exit thickness are very important factors. To realize high accuracy in the strip exit thickness, the Automatic Gauge Control (AGC) system is used. Because of roll eccentricity in backup rolls, the exit thickness deviates periodically. In this paper, we design PI controller in outer loop for the strip exit thickness while PD controller is ...
hot rolling mill roll eccentricity. Rolls in rolling mills are never completely round but have eccentricity which can be caused by • grinding inaccuracy • nonuniform thermal expansion • asymmetrical adjustment of bearing rolls shell via drive keys Each eccentricity consists of a base frequency which is the rotary frequency of the roll and several harmonic frequencies
where S 0 is unload ed roll gap; F 0 is rolling force; M is the mill stiffness or mill modulus. The strip thickness reference has to be created first d uring the lock- on process by
COUPLED PICKLING LINE & TANDEM COLD MILL High-capacity production of high-quality products For a wide range of products, the required strip thickness, flatness and surface quality can be achieved more economically by linking the pickling and cold-rolling processes.
Strip Thickness Control of Cold Rolling Mill with Roll Eccentricity Compensation by Using Fuzzy Neural Network Article (PDF Available) in Engineering 06(01):27-33 · January 2014 with 591 Reads
COUPLED PICKLING LINE & TANDEM COLD MILL High-capacity production of high-quality products For a wide range of products, the required strip thickness, flatness and surface quality can be achieved more economically by linking the pickling and cold-rolling processes.
Patent US4222254 - Gauge control using … A roll eccentricity control apparatus for use with an automatic gage control device of gage meter type for a rolling mill comprising rolls for rolling …
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hot rolling mill roll eccentricity. Active compensation of roll eccentricity in rolling mills . This paper is concerned with the active compensation of the roll-eccentricity-induced periodic disturbances in the strip exit thickness of hot and cold rolling mills. The roll eccentricity may be .
DOI: 10.4236/ENG.2014.61005 Corpus ID: 30768077. Strip Thickness Control of Cold Rolling Mill with Roll Eccentricity Compensation by Using Fuzzy Neural Network @article{Hameed2014StripTC, title={Strip Thickness Control of Cold Rolling Mill with Roll Eccentricity Compensation by Using Fuzzy Neural Network}, author={Waleed Ishaq Hameed and Khearia A. Mohamad}, journal={Engineering}, …
Roll eccentricity is a periodic disturbance caused by a structure of back up rolls in rolling mills, and it affects product thickness accuracy. It cannot be measured directly by sensors, so it should be identified by measured thickness or measured roll force. When there is a large difference of diameters between top and bottom back up roll, the performance of roll eccentricity control using ...
The analysis of a two-stand aluminium cold rolling mill has shown that process-related disturbances such as backup roll eccentricities and harmonic strip hardness variations can make it difficult to meet the target thickness tolerance. Backup roll eccentricity is not only the result of grinding and roll assembly tolerances, but can also be ...
ROLL ECCENTRICITY CONTROL WITH THE FORCE FEED ROLL ECCENTRICITY CONTROL WITH THE FORCE FEED FORWARD AGC SYSTEM Francis Wagner Manager Rolling Mill Automation Hatch Associates Consultants Inc. Buffalo NY USA ABSTRACT The Force Feed Forward (FFF) System is the only hot strip mill AGC system in the world today which does not incorporate the BISRA ...
Active compensation of roll eccentricity in rolling . 2002-8-6 · Abstract: This paper is concerned with the active compensation of the roll-eccentricity-induced periodic disturbances in the strip exit thickness of hot and cold rolling mills. The roll eccentricity may be caused by different reasons, e.g., inexact roll …
Hot rolling mill thus helps in reducing the size of a metal thereby molding it into the desired form and shape. Rolling mills perform the function to reform the metal pieces such as billet and ingot whilst maintaining its well equipped micro structure into bar, wire, sheet, strip, and plate. Hot rolled products are frequently categorized
Rolls in rolling mills are never completely round but have eccentricity which can be caused by: • grinding inaccuracy • non-uniform thermal expansion • asymmetrical adjustment of bearing rolls shell via drive keys Each eccentricity consists of a base frequency which is the rotary frequency of the roll and several harmonic frequencies.
hot rolling mill roll eccentricity. Rolls in rolling mills are never completely round but have eccentricity which can be caused by • grinding inaccuracy • nonuniform thermal expansion • asymmetrical adjustment of bearing rolls shell via drive keys Each eccentricity consists of a base frequency which is the rotary frequency of the roll and several harmonic frequencies
In rolling mill, the accuracy and quality of the strip exit thickness are very important factors. To realize high accuracy in the strip exit thickness, the Automatic Gauge Control (AGC) system is used. Because of roll eccentricity in backup rolls, the exit thickness deviates periodically. In this paper, we design PI controller in outer loop for the strip exit thickness while PD controller is ...
DOI: 10.4236/eng.2014.61005 Corpus ID: 30768077. Strip Thickness Control of Cold Rolling Mill with Roll Eccentricity Compensation by Using Fuzzy Neural Network @article{Hameed2014StripTC, title={Strip Thickness Control of Cold Rolling Mill with Roll Eccentricity Compensation by Using Fuzzy Neural Network}, author={Waleed Ishaq Hameed and Khearia A. Mohamad}, journal={Engineering}, …
Abstract This paper is concerned with the active compensation of the roll eccentricity-induced periodic disturbances in the strip exit thickness of hot and cold rolling mills. The roll eccentricity may be caused by different reasons like e.g. inexact roll grinding or nonuniform thermal expansion of the rolls.
