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How To Control Eccentricity Problem In Hot Rolling Mill

(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 …

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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 can be seen in Figure 1.

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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 cop01isc@sheffield.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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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 Process: Working, Application, Defects, Type of ...

Definition of Rolling process: Rolling is defined as a process to form metals where the metal strip is pressed by two or multiple rollers, thus the uniform thickness is formed. To do this, the temperature is essential. There are two types of processes. One …

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GB2059316A - Temperature control in hot strip mill ...

A method for controlling the temperature of a workpiece in a hot strip mill includes calculating temperature changes of the strip at each mill stand location by …

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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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The reasons about eccentricity of seamless steel pipe ...

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.

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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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Cold Rolling — Metals Magazine

A closer look at the past, present, and future of the Hyper Universal Crown Control Mill (Hyper UCM), the pioneering cold-rolling solution from Primetals Technologies ... modular coil shuttle system from Primetals Technologies is the cost-efficient solution of choice for coil logistics in hot-rolling, arvedi esp, and cold-rolling plants. ISSUE ...

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Metals - Nidec Industrial

Hot Rolling Mills for Flat Products •Hot Strip Mills •Plate Mills •Steckel Mills Hot Rolling Mills ... common standard software tools and, if new products come to market, there's no problem integrating them into the system. In other words, provides you with the ... - Roll Eccentricity Control - Rectangularity Control - Electric and ...

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H∞ Control system for tandem cold mills with roll ...

10%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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US4274273A - Temperature control in hot strip mill ...

US4274273A US06/081,563 US8156379A US4274273A US 4274273 A US4274273 A US 4274273A US 8156379 A US8156379 A US 8156379A US 4274273 A US4274273 A US 4274273A Authority US United States Prior art keywords workpiece temperature change spray mill Prior art date Legal status (The legal status is an assumption and is not a …

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H∞ Control system for tandem cold mills with roll eccentricity

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 …

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US3881335A - Roll eccentricity correction system and ...

A control system and method are disclosed to operate with at least one roll stand of a rolling mill to determine the magnitude and phase relationship of the eccentricity of each back-up roll of a four high roll stand, to monitor the rotation of the back-up rolls during the rolling process, and for each back up roll to correct the roll vertical position as a function of the roll angular ...

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Active compensation of roll eccentricity in rolling mills ...

To control the output thickness, the motion of hydraulic cylinder controlling the roll gap position is such that produces the desired output thickness [6]. Roll eccentricities are caused by axial...

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Analysis of guide modes in vertical hot ring rolling and ...

In the vertical hot ring rolling (VHRR) process, roundness, outer radius, and width spread are three important indexes to the formed ring's dimensional precision. In this paper, features of the guide modes of the VHRR process, such as single fixed guide mode (SFGM) and single follow-up guide mode (SFUGM), are analyzed to investigate their effects on the ring's …

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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 ( slab) Push-ovens

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

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 …

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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 eccentric rolls, were analyzed.

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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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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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Roll Eccentricity Control for Strip Rolling Mills ...

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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Tandem Rolling Process :: Total Materia Article

Tandem cold rolling mills are named by their stand arrangement and designed as "sheet mills" if they reduce hot band to sheet gauge or "tin mills" if they roll the same incoming material to tinplate stock. A typical five stand tandem cold rolling mill is illustrated in Figure 1. Figure 1: A typical five stand tandem cold rolling mill

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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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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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Looper and tension control in hot rolling mills: A survey ...

This paper considers some of the control issues in hot rolling mills. Hence to set the context, first we give a brief description of a typical process. The role of a hot strip mill process is to roll the slabs produced in a continuous casting process and produce strips of thickness 0.8–20 mm. Fig. 1 shows a typical layout of a hot strip mill.

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quality, a powerful controller is need- Rolling mill simulator

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.

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Tandem Rolling Process :: Total Materia Article

Once the mill speed is up to the present maximum mill speed, the speed control system will keep the rolling speed in the vicinity of the maximum speed. This phase is defined as run speed operation. Towards the end of a coil, the mill is decelerated to the preset de-threading speed preparing the strip for tailing out.

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Roll Eccentricity Extraction Method Based on Comprehensive ...

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.

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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 …

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University of Pretoria etd Scholtz, E (1999)

Different kinds of flat rolling mills exists, e.g. Sendzimer, Cluster, Steckel, 4-high, 5-high, 6-high, Z-high and Planetary mills [1, 2, 3]. In this dissertation the modelling of the hot rolling mill process is based on a Steckel Hot Rolling Mill. In the Appendix a short definition of common rolling terms are given. 1.1 Background

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Modeling and Extended State Observer Based Dynamic Surface ...

The modeling and control problems are investigated for cold rolling mill system. Firstly, we establish a monitor automatic gauge control (MAGC) model for a practical cold rolling mill system. The new model is with mismatched uncertainties. Then, an extended state observer (ESO) is developed to estimate uncertainties. In the general high-order systems, the ESO is …

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Increasing yield in Hot Rolling and Hot Forging ...

Percentage reduction in mill scale loss due to use of protective anti-scale coating: 56.98%. On an average, approximately 70% reduction in mill scale is usually achieved by the use of anti-scale protective coating in open die hot forging and hot rolling of stainless steel. This amounts to lucrative savings and increased yield.

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Roll Eccentricity Compensation | Primetals Technologies

Elimination of a known strip thickness quality disturbance from rolls. Improved strip quality, improved thickness tolerances also at high rolling speeds. Maintenance-friendly: uses existing thickness, roll load, or strip tension measurements as feedback for control, hence: easy to implement in existing basic automation environments.

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Roll eccentricity compensation based on anti-aliasing ...

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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The Engineering Design of Rolling Mill - A&L Alluminio e Leghe

A Cold Rolling Mill rolls, in subsequent short passes(due to the relative thick material), coiled strip from a thickness of up to 8 mm (coming from Hot Rolling Mill) down to 0.2 mm; the mill is designed with high rolling force and power capability and efficient and fast coil handling to minimize the waiting time.

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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

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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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