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.
from publication: Strip Thickness Control of Cold Rolling Mill with Roll Eccentricity Compensation by Using Fuzzy Neural Network | In rolling mill, …
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.
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.
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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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 ...
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 …
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 ...
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.
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 …
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
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. …
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 …
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
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.
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 ...
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 …
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
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
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.
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 ...
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.
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.
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 ...
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 ...
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
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 …