Roll Eccentricity Control for Strip Rolling Mills ...

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 ...

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Roll Eccentricity Control for Strip Rolling Mills ...

An in-depth review of the roll eccentricity control design problem is provided which encompasses a number of recent, novel, design contributions and includes experimental results from two separate steel, tandem cold rolling mill installations.

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Roll Eccentricity Control by Using a Bandpass Filter ...

Sep 01, 2001· 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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Online Monitoring System Design for Roll Eccentricity in ...

The key equipme nt in hot/cold tand em rolling mills is the finishing mill g roup, which usually consists o f 7 mill stands in hot rolling and 5 mill stands in cold rolling.

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The Complete Technology Book on Hot Rolling of Steel

then the process is termed as hot rolling. The hot mills using plain rolls were already being employed by the end of the seventeenth century. But the industrial revolution in the nineteenth century saw a new horizon in ... Roll Eccentricity Control Methods Passive roll eccentricity control methods Active roll eccentricity control methods

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Advanced Process and Quality Control in Hot Rolling Mills ...

3.1 Key Feature of Process Control: Detection of Periodic Defects Rolls and rollers are the most heavily used parts of a rolling mill. Due to wear from contacting hot material with great force, their lifetime is limited. Although rolls are refurbished in the roll shop regularly, they occasionally crack before the end of the usual production cycle.

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(PDF) Hot rolling mill hydraulic gap control (HGC ...

P. Kucsera et al. Hot Rolling Mill HGC Thickness Control Improvem ent – 102 – Where v is mill speed and l is the distance bet ween the wo rk ro lls and the X -ray

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Thickness Control for a Steel Beam - MATLAB & Simulink Example

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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[PDF] Hot Rolling Mill Hydraulic Gap Control ( HGC ...

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. The improved system has been validated ...

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The Hot Rolling Process

CSI’s Hot Strip Mill includes six finishing mills, which reduce the thickness of the transfer bar down to the gauge required by the customer or the next process. The rolling speed is set to allow the last stand to perform the final reduction at the finishing temperature, between 1500° to 1650°F, specified to reach certain mechanical properties.

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Roll Eccentricity Control by Using a Bandpass Filter ...

Sep 01, 2001· 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.

Get Price

Advanced Process and Quality Control in Hot Rolling Mills ...

3.1 Key Feature of Process Control: Detection of Periodic Defects Rolls and rollers are the most heavily used parts of a rolling mill. Due to wear from contacting hot material with great force, their lifetime is limited. Although rolls are refurbished in the roll shop regularly, they occasionally crack before the end of the usual production cycle.

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The Complete Technology Book on Hot Rolling of Steel

then the process is termed as hot rolling. The hot mills using plain rolls were already being employed by the end of the seventeenth century. But the industrial revolution in the nineteenth century saw a new horizon in ... Roll Eccentricity Control Methods Passive roll eccentricity control methods Active roll eccentricity control methods

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Unwind/rewind eccentricity control for rolling mills ...

Unwind/rewind eccentricity control for rolling mills . United States Patent 4905491 . Abstract: A method of rolling material in a rolling mill in which the material is directed from an unwind coil of the material to the mill and/or to a rewind coil of the material from the mill, the material being under tension as it is directed to and from the ...

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Neural network for identification of roll eccentricity in ...

Jun 15, 1996· The roll eccentricity in a rolling mill may define the limit of achievable thickness tolerances and thus is subject of interest for the automation equipment in hot rolling mills as well as in cold rolling mills. Today's demand on thickness tolerances less than 0.8% require efficient methods for roll eccentricity identification and compensation.

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Hot Rolling Mill Hydraulic Gap Control (HGC) thickness ...

accuracy in thickness control in metal rolling area. If the required accuracy of hot rolling mills can be achieved, then in some cases, cold rolling is not even required, which can result in a radical decrease of production costs. The schematic structure of a typical aluminum hot reversing rolling mill …

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A BASIC UNDERSTANDING OF THE MECHANICS OF …

cooling system. Problems of this kind can never really be calculated but they have a detrimental effect on all rolling schedules including stresses in the roll. As regards “abnormal” rolling conditions - which are more or less very “normal” for rolling mills - roll damage often occurs with consequences for the mill and the rolled product.

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Seamless steel pipe produces eccentricity (uneven ...

The picture above shows the seamless steel pipe perforation site. The eccentricity of many steel pipes is generated at this time, so it is very important to strictly control this perforation. Finished steel pipe Cold drawn steel pipe can also cause eccentricity problems due to perforation:

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The Hot Rolling Process

CSI’s Hot Strip Mill includes six finishing mills, which reduce the thickness of the transfer bar down to the gauge required by the customer or the next process. The rolling speed is set to allow the last stand to perform the final reduction at the finishing temperature, between 1500° to 1650°F, specified to reach certain mechanical properties.

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Optimization of a Cold Rolling Mill - Thermo Fisher Scientific

I summarizes the typical thicknesses and rolling speeds for each mill type. Not surprisingly, as the material gets thinner, the speeds increase dramatically. Hot Roughing Mill Hot Finish Mill Cold Rolling Mill Maximum Thickness > 400 mm 20-50 mm 3-20 mm Minimum Thickness 20-50 mm 3-20 mm 0.100 mm Rolling speeds (meters per min) ~ 100 ~ 1000 ~ 2000

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CiteSeerX — ROLL ECCENTRICITY CONTROL WITH THE FORCE …

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 need not replace their ...

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Multi-resolution Wavelet Method for Roll Eccentricity ...

The roll eccentricity in a rolling mill may define the limit of achievable thickness tolerances and thus is subject of interest for the automation equipment in hot rolling mills as well as in cold ...

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Technological packages › Flat › HAGC ‹ Danieli

Hot Rolling Mills. 54/154. Processes & technologies; Technological packages; HAGC. Hydraulic automatic gauge control. BENEFITS. Fast-response thickness control ; High-accuracy gap positioning ; Smaller thickness tolerances and faster thickness correction ... Back-up roll eccentricity compensation ; Outstanding accuracy and dynamic response ...

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LQG Regulation: Rolling Mill Case Study - MATLAB & Simulink

LQG Regulation: Rolling Mill Case Study Overview of this Case Study. This case study demonstrates the use of the LQG design tools in a process control application. The goal is to regulate the horizontal and vertical thickness of the beam produced by a hot steel rolling mill.

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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 caused by different reasons, like e.g. inexact roll grinding or nonuniform thermal expansion of the rolls. The increasing demands on the thickness tolerances require new methods for the active ...

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Multi-resolution Wavelet Method for Roll Eccentricity ...

The roll eccentricity in a rolling mill may define the limit of achievable thickness tolerances and thus is subject of interest for the automation equipment in hot rolling mills as well as in cold ...

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Seamless steel pipe produces eccentricity (uneven ...

The picture above shows the seamless steel pipe perforation site. The eccentricity of many steel pipes is generated at this time, so it is very important to strictly control this perforation. Finished steel pipe Cold drawn steel pipe can also cause eccentricity problems due to perforation:

Get Price

The Complete Technology Book on Hot Rolling of Steel

then the process is termed as hot rolling. The hot mills using plain rolls were already being employed by the end of the seventeenth century. But the industrial revolution in the nineteenth century saw a new horizon in ... Roll Eccentricity Control Methods Passive roll eccentricity control methods Active roll eccentricity control methods

Get Price

CiteSeerX — ROLL ECCENTRICITY CONTROL WITH THE FORCE …

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 need not replace their ...

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H∞ Control system for tandem cold mills with roll eccentricity

Firstly this paper proposes a lumped-parameter hot-rolling mill model. The rolling mill examined is reversible and equipped with an independent speed control system for each work roll (two single ...

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Multi-resolution wavelet method for roll eccentricity ...

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 ...

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Upgrading of Hot Finishing Mill to 4-Stands, and ...

an overview of the hot finisher mill after the upgrade, and describes the new control technology and hot rolling pro-cess control system that were introduced. 2. GENERAL DESCRIPTION The hot rolling mill of the Fukui Works went into service in May, 1983 as a world-class facility, equipped with large rolling stands capable of producing wide ...

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Technological packages › Flat › HAGC ‹ Danieli

Hot Rolling Mills. 54/154. Processes & technologies; Technological packages; HAGC. Hydraulic automatic gauge control. BENEFITS. Fast-response thickness control ; High-accuracy gap positioning ; Smaller thickness tolerances and faster thickness correction ... Back-up roll eccentricity compensation ; Outstanding accuracy and dynamic response ...

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HOT ROLLING PRACTICE – An Attempted Recollection

motors. These are known as mill stands. The layout of a rolling mill varies, from a simple single stand mill to several stands positioned either side by side or in a line. A mechanism, commonly called a roller table, directs the work piece to the rolls, and another roller table for …

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Hot Rolling Mill Hydraulic Gap Control (HGC) thickness ...

accuracy in thickness control in metal rolling area. If the required accuracy of hot rolling mills can be achieved, then in some cases, cold rolling is not even required, which can result in a radical decrease of production costs. The schematic structure of a typical aluminum hot reversing rolling mill …

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POINTWISE LINEAR QUADRATIC OPTIMAL CONTROL OF A …

POINTWISE LINEAR QUADRATIC OPTIMAL CONTROL OF A TANDEM COLD ROLLING MILL John R. Pittner, PhD University of Pittsburgh, 2006 The tandem cold rolling of metal strip is a complex multivariable process whose control presents a significant engineering challenge. The present technology generally relies on a control

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Unwind/rewind eccentricity control for rolling mills ...

Unwind/rewind eccentricity control for rolling mills . United States Patent 4905491 . Abstract: A method of rolling material in a rolling mill in which the material is directed from an unwind coil of the material to the mill and/or to a rewind coil of the material from the mill, the material being under tension as it is directed to and from the ...

Get Price

Thickness Control for a Steel Beam - MATLAB & Simulink ...

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.

Get Price