hot rolling mill roll eccentricity

hot rolling mill roll eccentricity

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 ...

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Effect of roll eccentricity on output strip thickness ...

The hot rolling mill environment is quite harsh, so the X-ray thickness gauge is placed a few meters away from the roll gap. The dead time can be

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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

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Roll Eccentricity Control for Strip Rolling Mills ...

1987-7-1 · 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. A unifying approach to eccentricity control ~nables the diverse range of published ...

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Neural network for identification of roll eccentricity in ...

1996-6-15 · This paper should present a solution for identifying roll eccentricity by using a neural network with a comparison to other methods in order to show the advantages and disadvantages for further use in a roll eccentricity compensation. The solution is verified on measured data sets of a cold rolling mill. Previous article. in issue.

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Roll Eccentricity Control Using Identified Eccentricity of ...

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 Compensation — Metals Magazine

2018-3-1 · Roll-Eccentricity Compensation (REC) from Primetals Technologies rises to these challenges. It is a fully digital model-based control that models the shape of the eccentricity during rolling. As input, depending on availability, it uses a combination of data on the exit thickness, entry strip tension, and roll force to extract any eccentricities.

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Method of measuring and compensating roll eccentricity

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

2013-11-12 · 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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Hot Rolling Mill Hydraulic Gap Control (HGC) thickness ...

2015-11-4 · P. Kucsera et al. Hot Rolling Mill HGC Thickness Control Improvement – 98 – Another way to determine the thermal expansion of the work roll is the modelling of the heat transfer between the work rolls and the strip.

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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

Read More

Roll eccentricity compensation based on anti-aliasing ...

2009-2-1 · 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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Rolling mill roll eccentricity control - Kaiser Aluminum ...

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 force applied axially to the ends or necks of ...

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Roll-Eccentricity Compensation — Metals Magazine

2018-3-1 · Roll-Eccentricity Compensation (REC) from Primetals Technologies rises to these challenges. It is a fully digital model-based control that models the shape of the eccentricity during rolling. As input, depending on availability, it uses a combination of data on the exit thickness, entry strip tension, and roll force to extract any eccentricities.

Read More

Online Monitoring System Design for Roll Eccentricity in ...

2015-6-5 · Abstract: This paper deals with the parameter estimation and online monitoring of roll eccentricity in rolling mills. Roll-eccentricity-induced disturbances can result in strip thickness deviation and product quality degradation, and a conventional control strategy cannot regulate this kind of periodic disturbances due to its complex characteristics.

Read More

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

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Roll Eccentricity Phase Identification System | Scientific.Net

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

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Online Eccentricity Monitoring Weihong Guo of

2019-9-10 · 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

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1. Hot rolling and rolling defects: 1.1 Front and back ...

2019-2-4 · bulged rolls, when subjected to bending during rolling will produce flat sheets. For sheet rolling, normally camber of 0.5 mm on roll diameter is provided. Also during hot rolling, rolls get heated up and bulge out at the center, causing camber of the rolls. This is due to temperature variation between edges and the center of rolls.

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The Hot Rolling Process - California Steel

The Hot Rolling Process The primary function of the Hot Strip Mill is to reheat semi-finished steel slabs of steel nearly to their melting point, then roll them thinner and longer through 12 successive rolling mill stands driven by motors totaling 77,000 hp, and finally coiling up the lengthened steel sheet for transport to the next process.

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Rolling mill roll eccentricity control - Kaiser Aluminum ...

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 force applied axially to the ends or necks of ...

Read More

Roll eccentricity compensation based on anti-aliasing ...

2009-2-1 · 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

Read More

H∞ Control system for tandem cold mills with roll

2004-1-1 · 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

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Roll-Eccentricity Compensation — Metals Magazine

2018-3-1 · Roll-Eccentricity Compensation (REC) from Primetals Technologies rises to these challenges. It is a fully digital model-based control that models the shape of the eccentricity during rolling. As input, depending on availability, it uses a combination of data on the exit thickness, entry strip tension, and roll force to extract any eccentricities.

Read More

Online Monitoring System Design for Roll Eccentricity in ...

2015-6-5 · Abstract: This paper deals with the parameter estimation and online monitoring of roll eccentricity in rolling mills. Roll-eccentricity-induced disturbances can result in strip thickness deviation and product quality degradation, and a conventional control strategy cannot regulate this kind of periodic disturbances due to its complex characteristics.

Read More

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

Read More

Roll Eccentricity Phase Identification System | Scientific.Net

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

Read More

Online Eccentricity Monitoring Weihong Guo of

2019-9-10 · 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

Read More

Steel Rolls for Rolling Mills - US Korea Hotlink

2019-12-5 · • Hot Rolling Mill Rolls • Thick Plate Line • Continuous Casting Line • Precision Machined Parts, Roll Assemblies Pg. 4 Rolling Mill Roll Manufacturing Capabilities • Steel Roll Diameter • Steel Roll Length • Heat Treating and Coating Options • Materials Pg. 5 Rolling Mill Steel Roll Patented Technology & Certification Pg. 6

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1. Hot rolling and rolling defects: 1.1 Front and back ...

2019-2-4 · bulged rolls, when subjected to bending during rolling will produce flat sheets. For sheet rolling, normally camber of 0.5 mm on roll diameter is provided. Also during hot rolling, rolls get heated up and bulge out at the center, causing camber of the rolls. This is due to temperature variation between edges and the center of rolls.

Read More