These studies had concentrated to improve the mill stretch design and the rolling speed control in order to accomplish fine thickness with respect to …
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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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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 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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1.2 Lock-on Type Gauge Control Under steady state rolling conditions, a linear relationship between the exit strip thickness, roll gap, and rolling force can be expressed by spring equation Eq. (1): M F h S 0 0 (1) where S 0 is unloaded roll gap; F 0 is rolling force; M is the mill stiffness or mill modulus.
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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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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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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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The method of controlling rolling pressure and roll bending pressure in a rolling mill stand so as to provide independent adjustment of work gauge and flatness, comprising continuously measuring the separation between work rolls, converting that measurement to a gauge signal, continuously determining the inclination of a work roll axis to the ...
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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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Paper mill calendering optimal caliper control and no more waste with induction roll heating system published on febru febru 3 likes 0 comments. Designing Of Hot Strip Rolling Mill Control System. Aimed at the complex demand of hot strip rolling mill in practicing, the configuration of the coiler and the technological process is analyzed. the ...
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To meet this requirement, an output regulating control system with a roll-eccentricity estimator for each rolling stand of tandem cold mills was considered. Assuming entry …
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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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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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The present invention relates to the providing of a rolling mill that makes it possible to more accurately control the shape of a plate material than has hitherto been possible, and to a rolling method, and is a rolling mill that rolls a plate material using vertical work rolls, and that includes: a coolant jet spray unit that has a plurality of nozzles that are arranged at predetermined ...
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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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This roll eccentricity disturbances cause periodic delivery thickness variations, which can be determined by measuring the rolling force signal from load cell, the delivery thickness signal from the gauge meter installed in the delivery side of stand, the gap sensor is installed in the cylinder and the measured tension between stands.
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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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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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These studies had concentrated to improve the mill stretch design and the rolling speed control in order to accomplish fine thickness with respect to …
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Repetitive control theory is applied to roll eccentricity control as roll eccentricity is a periodic disturbance related to the rotational angle of the rolls. ... Hameed W, Mohamad K (2014) Strip thickness control of cold rolling mill with roll eccentricity compensation by using fuzzy neural network. Engineering 6(1):27–33.
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The rolling force prediction stand for a variable. It is a natural way to consider the moving feed forward control. Considering the stand as a average of the signal s (t) spring, the changes in strip thickness ∆h, rolling mill cylinders ∆S and rolling force ∆F, fulfill Hook's law: − 1 t (5) ∆h = ∆S + 1 ∆F (1) s (t) = ∆ ∫ s ...
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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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Moreover an FFF installation requires only about nine (9) months after which time the System is fully operational at the specified gage performance. One of the factors responsible for this high level of gage control is the unique method by which the System deals with the problem of roll stack eccentricity. This paper describes that method.
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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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Rolling mill eccentricity compensation using actual measurement of exit sheet thickness: : Oliver et al. 72/8: 4126027: Method and apparatus for eccentricity correction in a rolling mill: : Smith, Jr. et al. 72/21: 3882705: Roll eccentricity correction system and method: : Fox: 72/11: 3881335: Roll eccentricity ...
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Hot working safety in forging, hot rolling mill operation, safe guards in hot rolling mills – hot bending of pipes, hazards and control measures. Safety in gas furnace operation, cupola, crucibles, ovens, foundry health hazards, work environment, material handling in foundries, foundry production cleaning and finishing foundry processes.
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Thickness deviations of the steel plates in the rolling mill process is mainly caused by the roll eccentricity of the back up roll (BUR). In this paper, a bandpass filter with high gain in the given frequency is introduced which is able to overcome the roll eccentricity of BUR and is very simple compared with other roll eccentricity control (REC) methods.
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Rolling Mill Tutorial - Part 5. Before continuing, make sure you have read Section 21.11: Linear Optimal Filters. Observers. To estimate roll eccentricity, we view the output of the BISRA gauge (which is h + e) as the eccentricity e plus some noise. Before we can use an observer to estimate the roll eccentricity, we need to model it. As before ...
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After the successful simulation study, the control concepts were implemented on the two-stand cold rolling mill. In observation mode the functions for eccentricity and hardness compensation could be monitored and preoptimized in parallel to normal operation with no effect on the current operation of the mill.
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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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Rolling schedules can be carried out with an even or odd number of passes to maximize mill availability and performance. The Universal Crown Control mill (UCM mill) with work roll bending, intermediate roll bending, intermediate roll shifting and all straight roll application ensure enhanced flatness control.
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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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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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