rolling mill roll eccentricity control
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- rolling mill roll eccentricity control
from publication: Strip Thickness Control of Cold Rolling Mill with Roll Eccentricity Compensation by Using Fuzzy Neural Network | In rolling mill, …
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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 ...
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An encoderless roll eccentricity compensation system for rolling mills and sheet casters; Shop floor inventory and production tracking systems for hot rolled plate and coiled products and for sheet finishing operations; A standard hydraulic mill stand control product for rolling mills
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Roll eccentricity control Irregularities in roll geometry cause periodic varia- tions in the roll gap, which can lead to variations in thickness of the rolled product. The predominant sources of these variations are the backup rolls of the stand. The function compensates for periodic disturbance from geometric asymmetries on the backup rolls.
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The problem of roll eccentricity has become one of important factors to affect the quality of strips as downstream industries require improvement of the strip quality. Reducing thickness control precision as little as possible is incompatible with restraining roll eccentricity perturbations on the requirement of the deadband size for the deadband drift method (DDM) with fixed deadband …
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The control of a rolling mill requires the output gauge to be regulated in the face of eccentricity and input hardness disturbances using measured roll-force. This is one of those control problems where it is not the measured variable which is controlled directly, but the measured variable is used to achieve control or regulation of another ...
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With the increase request of strip quality, the roller eccentricity has become the important factor of influencing product quality. On the practical model of Cold-rolling Mill of 300, this paper establishes eccentricity compensation control practice of Cold-rolling Mill of 300 which applies wavelet transform method. Based on mufti-resolution decomposition of roll force signal by use …
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ARTICS Hot Rolling Mills Real time control for Hot Rolling Mills. With more than 50 years of experience, Nidec Industrial Solutions has developed a vast array of functions based on auto-adaptive mathematical models that optimize rolling schedule calculations in real time.
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the invention relates to the control of rolling mill backup roll eccentricity by combining the load carrying characteristics of rolling mill tapered roller bearing assemblies during rolling with prescribed levels of axial thrust to effect a controlled deflection of backup roll necks on a 4-high rolling mill or the like due to the selected thrust …
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Loop control to Roll Mill YouTube . Jul 24 2013 re bar rolling mill wire rod rolling mill bar rolling mill tmt rolling mill steel rolling mill Duration 4 46 Preet Machines Limited 34 236 views
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Rolling mill simulator A new platform for testing, analysis and optimization of cold rolling mills. Axel Brickwedde, Frank Feldmann, Nicolas Soler The cold rolling of flat metal products especially in tandem or multi-stand mills is a highly complex process where the product quality is influenced by various aspects.
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Cold rolling mill Roll eccentricity Wavelet packet Compensation control TP273 [—]
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Feedback control is necessary to reduce the effect of these disturbances. Because the roll gap cannot be measured close to the mill stand, the rolling force is used instead for feedback. The input thickness disturbance is modeled as a low pass filter driven by white noise.
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an off-line eccentricity identification method which is performed when there is no plate rolling through the mill and with the top work roll and the bottom work roll in tight contact, said off-line eccentricity identification method determining the eccentricity values of N first points which equally divide a circumference of the top backup roll ...
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A key characteristic of roll eccentricity disturbances is that they are not stationary. That is. although the initial waveform for each roll may be the resul t of grinding practices and bearing characteristics. the resultant waveform due to all rolls may change due to non-uniform thermal expansion and wear. and other factors.
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Rolling mill roll eccentricity control US4484285A (en) : Load-transfer mechanism US4481801A (en) : Load-transfer mechanism Legal Events. Date Code Title Description; : AS: Assignment: Owner name: BLAW-KNOX COMPANY. Free format text: MERGER ...
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A method based on the least square (LS) method is introduced in this paper to analyze and calculate the characteristic parameters of periodic export thickness e
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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 …
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Strip Thickness Control of Cold Rolling Mill with Roll Eccentricity Compensation by Using Fuzzy Neural Network Waleed I. Hameed, Khearia A. Mohamad Department of Electrical Engineering, University of Basrah, Basrah, Iraq . Email: waleed_ishaq5@yahoo Received November 12, 2013; revised December 12, 2013; …
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Rolling mill is the core equipment in modern iron and steel industry, and the reliability of its mill roll system (MRS) is the key to ensure the rolling process with high precision, high speed ...
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During hot rolling the microstructure and mechanical properties of the material change with its thermomechanical state determined by composition percent reduction strip thickness strip speed and heat transfer For steels hot rolling is generally conducted at 850–1200 176C in the austenite phase while for aluminum it is conducted at 350–500 176C
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In order to meet the requirement for higher thickness accuracy in cold rolling processes, it is strongly desired to have high performance in control units. To meet this requirement, we have considered an output regulating control system with a roll-eccentricity estimator for each rolling stand of tandem cold mills. Considering entry thickness variation as well as roll eccentricity …
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Crown control actuator settings PSC5: Roll eccentricity elimination control PC1: Rougher master, table master PC2: Rougher sub-machine control master PC3: Machines around rougher mill control master, Automatic gauge control PC4: Slab cooling temperature control Figure 2 Configuration of computer control system for hot strip rolling mill Roll ...
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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 …
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Cold Rolling Mills The evolution of rolling mills has accelerated as the speed of processors and digital controls have grown by orders of magnitude. The capital cost in a rolling mill is substantial and investors understand that in order to achieve the maximum ROI and shortest payback time, the mill needs to produce high quality sheet at the ...
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Aluminum Hot Rolling Mill. Integrated Solenoid Valve (ISV) Spray System. ISV Roll coolant spray bars for hot and cold rolling mill strip flatness control. Coil Eccentricity Expert. Elimination of a known strip quality disturbance. EdgeMon. Inspection of side-trimmed strip edge surface for steel pickling and processing lines and aluminum rolling.
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Roll eccentricity compensation based on anti. Feb 01, 2009 0183 32 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 …
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Roll eccentricity is ubiquitous in strip mills, which has a periodic impact on the strip thickness difference. Roll eccentricity compensation is an important part of the automatic gauge control system. Most roll eccentricity compensations extract the roll eccentricity based on the frequency domain analysis of the rolling force.
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A Foil Rolling Mill rolls, in subsequent long passes(due to the relative thin material), coiled strip (coiled on steel spool) from a thickness of up to 0.6 mm (coming from Cold rolling Mill) down to 2 x 5 µm; the mill is designed in order to roll in closed gap.
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ISV Roll coolant spray bars for hot and cold rolling mill strip flatness control Coil Eccentricity Expert Elimination of a known strip quality disturbance EdgeMon Inspection of side-trimmed strip edge surface for steel pickling and processing lines and aluminum rolling
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CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): The Force Feed Forward (FFF) System is the only hot strip mill AGC system in the world today which does not incorporate the BISRA principle for gage control. Instead, using a revolutionary control algorithm, FFF has proven in five installations in North and South America, that steelmakers …
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China 6-High Reversible Cold Rolling Mill, Find details about China Cold Rolling Mill, Rolling Mill from 6-High Reversible Cold Rolling Mill - Hebei Moran Environmental Protection Technology Corp.
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through feature selection and statistical quality control methods. Hotelling T2 control charts are then constructed for online process monitoring and detecting eccentricity problems in the cross-roll piercing mill. The remainder of this paper is organized as follows. Section 2 describes the product quality information obtained from UT
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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 …
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The eccentricity disturbance is modeled as white noise w_e driving a band-pass filter Fe. The input thickness disturbance is modeled as white noise w_i driving a low-pass filter Fi. Feedback control is necessary to counter such disturbances. Because the roll gap delta cannot be measured close to the stand, the rolling force f is used for feedback.
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In this article the AGC (Automated Gauge Control) system, of a hot rolling mill is analyzed and different methods are described to improve its performance. The mill stretch compensation and other disturbances during the rolling process are compensated and a rolling speed dependent, adaptive PI controller is developed to accomplish fine thickness control. …
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A method of correcting the thickness variations of a rolling plate by controlling at least one of the top or bottom backup rolls of a rolling mill. The method further comprises an off-line eccentricity identification method, and an on-line eccentricity compensation method.
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