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Method of measuring and compensating roll eccentricity of ...

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

These studies had concentrated to improve the mill stretch design and the rolling speed control in order to accomplish fine thickness with respect to the compensation of the roll eccentricity and ...

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(PDF) Strip Thickness Control of Cold Rolling Mill with ...

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 ...

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Roll Eccentricity Control by Using a Bandpass Filter ...

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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US4905491A - Unwind/rewind eccentricity control for ...

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 mill. The directing process has at least one cyclic disturbance which ordinarily causes cyclic changes in the tension of the material and in the ...

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Seamless steel pipe produces eccentricity (uneven ...

Finished steel pipe Cold drawn steel pipe can also cause eccentricity problems due to perforation: Any factor that destroys the geometrical correctness of the deformation zone formed by the roll, the head and the guide plate will increase the uneven thickness of the capillary wall. (1) Head.

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Active compensation of roll eccentricity in rolling mills ...

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.

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INDUSTRIAL APPLICATIONS OF PREDICTIVE FUNCTIONAL …

1978 : 1st contribution MPC " Automatica " ( problems..!) 1980-85 : HIECON with Set Point ( Houston) 1989 : Extension from PFC to PPC: Parametric Predictive Control (control by reactor flow..) ... Thickness control - Roll eccentricity Mono-multi-stands Rolling mills Continuous casting ( …

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Advanced Process and Quality Control in Hot Rolling …

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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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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control rolling mill

Table 1 from Strip Thickness Control of Cold Rolling Mill ... 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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Parameter Identi cation and Filter Design for a Repetitive ...

Abstract: In hot rolling mill products, periodic surface defects are encountered due to the inherent eccentricity present in the rolls. These defects can be considered as periodic disturbance to the system. To remove these defects, a controller design based on Repetitive Control method is investigated. By rst approximating hot rolling mills from

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Strip Thickness Control of Cold Rolling Mill with Roll ...

been developed for hot or cold mill processes. The Brit-ish Iron and SteelResearch Association (B1SRA) AGC method based on the gaug meter principle and the feede forward AGC method using the delivery time of the strip have been widely utilized in steel rolling mills [3]. Strip products thickness precision is an important quality parameter.

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Temperature control in hot strip mill - General Electric ...

These strategies are well known and are described, for example, in "Automatic Shape Control-- Hoogoven's 88--In. Hot Strip Mill" by F. Hollander and A. G. Reinen, Iron and Steel Engineer, April, 1976. Strip flatness control will be improved where the rolling force at each stand is maintained more nearly constant throughout the strip length.

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Winner's Engineering Solutions | Rolling Mills

Comprehensive control scheme for the mill (FF: feedforward; FB: feedback; CEC: coil eccentricity compensation; MFC: mass flow control) 20-High Cold Rolling Mill. Feature Highlights of the 20-High Rolling Mill. 1. Wide range of thickness and width for different type of steel strips. Thickness: 0.05-1.2 mm; width: 50 - 1250 mm. Rolling Process Brief

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Rolling mill strip thickness controller - John Lysaght ...

Method and apparatus for eccentricity correction in a rolling mill: : Smith, Jr. et al. 72/11: 3543549: ROLLING MILL CONTROL FOR COMPENSATING FOR THE ECCENTRICITY OF THE ROLLS: : Howard: 72/8

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9th INTERNATIONAL ROLLING MILL ACADEMY

ADVANCED CONTROL 9th INTERNATIONAL ROLLING MILL ACADEMY 5-9 November 2007 - Glasgow, Scotland The lectures will be given by leading international experts in hot and cold mill control systems. As well as providing an in-depth understanding of the theory they will also explain the practical issues of implementing rolling mill control systems.

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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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How To Control Eccentricity Problem In Hot Rolling Mill

Roll Eccentricity Control for Strip Rolling Mills A design of automation systems for the competi tive summary of the background to the control ofproduction of metal strip products thickness in rolling mills is described in an The thickness control problem is further earlier paper by Edwards (1987) exacerbated by the fact that tolerances are For a single stand mill, control is commonly

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methods to control eccentricity in forged rolls

Jul 01, 1987· Awtm/ia Abstract: 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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Loop monitoring and assessment of hot strip mill control

The object of the thesis work was to test assessment and monitoring tools for the control of a hot strip rolling mill. Two control system were also evaluated, work roll bending control and gap control. The effectiveness of a filter, that is used within the control to remove the effect of …

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Non-circular grinding of backup rolls to reduce rolling ...

The steel mills built in the 1960s and 1970s and even later are looking for cost-effective means to meet the new demands. This study discusses a method of reducing the force variation in the milling stand. Typically a rolling mill consists of 1–7 rolling stands. There are usually two, three or …

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Hot rolling flat — Metals Magazine

Hot rolling flat A Common vision for excellence Primetals Technologies and partner thyssenkrupp Steel ­Europe have developed a new and groundbreaking vision-based strip-steering control system for hot-rolling mills.

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LQG Regulation: Rolling Mill Case Study - MATLAB ...

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 ...

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 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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Rolling Mill Roll Eccentricity Control

hot rolling mill roll eccentricity. 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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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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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 …

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Highest performing Hot Strip Mills | Primetals Technologies

ISV Roll coolant spray bars for hot and cold rolling mill strip flatness control Modular Coil Shuttle System (MCS) Rail-based, fully automated modular coil transport system Position Transducer Position measurement of rolling mill hydraulic capsule Roll Eccentricity Expert

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EP0155301A1 - Rolling mill strip thickness controller ...

Method and apparatus for automatic regulation of the thickness of a product (12) leaving a rolling mill. Signals indicating the total rolling force (F), the rolling interval position (S), the angular position (v) of a first rolling mill and the downstream thickness of the product (h) are used to obtain a signal output indicating the total rolling eccentricity affecting the actual instantaneous ...

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A SURVEY OF THE LOOPER-TENSION CONTROL …

CONTROL TECHNOLOGY IN HOT ROLLING MILLS Il Seop Choi∗, Anthony Rossiter∗, Peter Fleming∗ ∗ Automatic Control & Systems Engineering University of Sheffield Sheffield S1 3JD, UK [email protected]ffield.ac.uk Abstract: Looper and tension control is important in hot strip mills because it affects the strip quality as well as strip threading.

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