Roll Eccentricity Mills

Roll Eccentricity Mills

Roll Eccentricity Phase Identification System .

Roll eccentricity is widespread in the strip mill, has cyclical impact on strip thickness, so disturbance compensation is required to improve the product quality. The key step of disturbance compensation is to obtain reliable roll eccentricity signal. Existing direct measurements of roll eccentricity signal method requires special equipments with high precision but not practical enough.

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Online Eccentricity Monitoring Weihong Guo of Seamless

Online Eccentricity Monitoring of Seamless Tubes in Cross-Roll Piercing Mill Wall-thickness eccentricity is a major dimensional deviation problem in seamless steel tube production. Although eccentricity is mainly caused by abnormal process conditions in the cross-roll piercing mill, most seamless tube plants lack the monitoring at the hot piercing stage but only inspect the quality of

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how to control eccentricity problem in hot .

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. ; Neural network for identification of roll eccentricity in . Neural network for

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Active compensation of roll eccentricity in .

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 compensation of the contribution of the roll eccentricity to the final thickness deviation. The presented method is based on the factorization approach over the set of stable

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rolling mills parameters

Cold Rolling Mill Rolls Forged roll for cold rolling mills performs as a rolling tool to transform materials under normal room temperature therefore it is the most wear and tear spare parts during the rolling process .With 2 Cr 3 Cr 5 Cr material series we have greatly improved our products both in terms of quality and diversification . Chat Now ; Improvement of Accuracy for Gauge and

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Compensation of roll eccentricity disturbance in .

Compensation of roll eccentricity disturbance in cold rolling mills with hydraulic roll positioning system. / Bombois, XJA; Dewaele, JC; van der Weiden, AJJ. 1998. Research output: Contribution to conference › Abstract › Scientific

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Hot Rolling Mill Hydraulic Gap Control (HGC) thickness

Control; Mill stretch compensation; Roll eccentricity compensation; Thickness control; Adaptive; Predictive control 1 Introduction Nowadays, the competitive nature of different sectors (industry, agriculture, .) depends on technological improvements [1]. There is a growing demand for high accuracy in thickness control in metal rolling area. If the required accuracy of hot rolling mills can

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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 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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Study on Roller Eccentricity Compensation in a .

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 of

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Online Eccentricity Monitoring Weihong Guo of Seamless

Online Eccentricity Monitoring of Seamless Tubes in Cross-Roll Piercing Mill Wall-thickness eccentricity is a major dimensional deviation problem in seamless steel tube production. Although eccentricity is mainly caused by abnormal process conditions in the cross-roll piercing mill, most seamless tube plants lack the monitoring at the hot piercing stage but only inspect the quality of

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Spezialstahl-Walzwerke von Primetals Technologies

Das 12-Rollen-CR-Gerüst (Cold Rolling) ist eine unabhängige Eigenentwicklung von Primetals Technologies zum Walzen von rostfreiem Stahl sowie von Kupfer- und Nickellegierungen. Gegenüber einem ZR-Gerüst hat dieses Gerüst weniger Rollen und ermöglicht eine bessere Steuerung der Bandform. Darüber hinaus ist der Durchmesserbereich der Arbeitswalzen deutlich größer, sodass .

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how to control eccentricity problem in hot .

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. ; Neural network for identification of roll eccentricity in . Neural network for

get price

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 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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how to control eccentricity problem in hot .

ROLL ECCENTRICITY CONTROL WITH THE FORCE FEED FORWARD AGC SYSTEM Francis Wagner, Manager Rolling Mill Automation Hatch Associates Consultants, Inc., Buffalo, NY, USA ABSTRACT: 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.

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Rolling Mill Tutorial Part 5 The University of

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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Roll Eccentricity Control Using Identified .

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 using

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Roll Eccentricity Repetitive Compensation .

Download Citation On Nov 1, 2018, Zhe Yang and others published Roll Eccentricity Repetitive Compensation Control Based on Sparse Fourier Transform for Cold Rolling Mill Find, read and cite

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Roll Eccentricity Control for Strip Rolling Mills

01.07.1987 · Roll Eccentricity Control for Strip Rolling Iills GENERALISED EOCENTRICITY U>NTROL SYSTEM. The component functions in a controller which is designed to dynamically compensate arbitrary eccentricity disturbances caused by ple rolls .

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H∞ Control system for tandem cold mills with .

H∞ Control system for tandem cold mills with roll eccentricity. Article (PDF Available) in Journal of Mechanical Science and Technology 18(1):45-54 · January 2004 with 70 s How we measure

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Neural network for identification of roll .

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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Improvement of thickness tolerances in .

The analysis of a two-stand aluminium cold rolling mill has shown that process-related disturbances such as backup roll eccentricities and harmonic strip hardness variations can make it difficult to meet the target thickness tolerance. Backup roll eccentricity is not only the result of grinding and roll assembly tolerances, but can also be thermally induced during work roll changes and other

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Improvement of thickness tolerances in .

The analysis of a two-stand aluminium cold rolling mill has shown that process-related disturbances such as backup roll eccentricities and harmonic strip hardness variations can make it difficult to meet the target thickness tolerance. Backup roll eccentricity is not only the result of grinding and roll assembly tolerances, but can also be thermally induced during work roll changes and other

get price

Active compensation of roll eccentricity in .

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 compensation of the contribution of the roll eccentricity to the final thickness deviation. The presented method is based on the factorization approach over the set of stable

get price

Improvement of thickness tolerances in .

The analysis of a two-stand aluminium cold rolling mill has shown that process-related disturbances such as backup roll eccentricities and harmonic strip hardness variations can make it difficult to meet the target thickness tolerance. Backup roll eccentricity is not only the result of grinding and roll assembly tolerances, but can also be thermally induced during work roll changes and other

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hot rolling mill roll eccentricity .

Roll eccentricity is not part of the controller but must be considered to be consistent with data reported from operating mills which . Figure 3. Effects of roll eccentricity on output strip thick- ness. usually includes its effects. The eccentricity components remaining in the mill exit thickness after compensation.

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Roll Eccentricity Phase Identification System .

Roll eccentricity is widespread in the strip mill, has cyclical impact on strip thickness, so disturbance compensation is required to improve the product quality. The key step of disturbance compensation is to obtain reliable roll eccentricity signal. Existing direct measurements of roll eccentricity signal method requires special equipments with high precision but not practical enough.

get price

A Possible Mechanism for Causing Eccentricity in .

A theoretical analysis has shown that axial slipping of the sleeve on the roll arbor rather than plastic deformation of the roll necks may be the cause of backup-roll eccentricity on cold-rolling mills. The force levels required to initiate the slipping motion are less than the levels required to plastically yield the necks. Furthermore, the degree of eccentricity caused by relative motion may

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Technological control for cold rolling processes

n Roll eccentricity control n Tension feed-forward control Thickness feedback control The basic control strategy is thickness feedback (monitor control) based on the measured thickness deviation at the exit side of the mill. The delay time, transport of the strip from the roll gap to the thickness gauge, essentially determines the control system's dynamic response, particular at low rolling

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ROLL ECCENTRICITY COMPENSATION (REC)

Rolls in rolling mills are never completely round but have eccentricity which can be caused by: • grinding inaccuracy • non-uniform thermal expansion • asymmetrical adjustment of bearing rolls shell via drive keys Each eccentricity consists of a base frequency which is the rotary frequency of the roll and several harmonic frequencies. Every roll of each roll stack can show such

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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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