how to control eccentricity problem in hot rolling mill

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 …

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.

Roll Eccentricity Control for Strip Rolling Mills ...

The strip exit thickness h, is given by: h =S (F,W) + (S-So) + e (1) where S (F,W) is the elastic deformation of the stand components, W is the strip width, S is the rollgap position with respect to an arbitrary datum, So is a constant and e is the effective total eccentricity signal for the complete set of rolls in the mill.

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

Strip Thickness Control of Cold Rolling Mill with Roll Eccentricity Compensation by Using Fuzzy Neural Network 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

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.

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...

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

The rolled strip is cooled down by spraying water in a run-out table and coiled by a down coiler. The final product may be processed further through cold rolling mills in order to produce thinner steel sheet. However, the quality of these thinner sheets is seriously affected by any quality defects arising during hot rolling.

H∞ Control system for tandem cold mills with roll …

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 …

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 …

Control, Automation and the Hot Rolling of Steel

Control, automation and the hot rolling of steel By P. J. Reeve, A. F. MacAlister and T. S. Bilkhu ALSTOM Drives & Controls Ltd], Boughton Road, Rugby CV21 1BU, UK The current state of automation and control for hot rolling mills, with a particular emphasis on flat products, is introduced. A typical modern control-system design

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 …

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.

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 ...

Roll Eccentricity Control by Using a Bandpass Filter ...

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. This filter has a distinctive characteristic. The only required information for designing the filter is revolution time of BUR.

Application of Singular Perturbation Control Technology in ...

improve the competitiveness model of hot rolling production line of steel products, study and solve the quality problem of the thickness accuracy has become very necessary. In this paper, a new method for thickness control is proposed, which is based on the singular perturbation control technology. II.

High-Quality Steel Rolling: Theory and Practice - Vladimir ...

Emphasizing solutions to the problems of achieving tight tolerances of important geometrical parameters such as thickness, width, cross-sectional profile, and flatness, this reference focuses on the principles and applications of the latest technology for producing high-quality, flat-rolled steel products.;Illustrated with more than 700 drawings, High-Quality Steel …

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.

Hot rolling flat — Metals Magazine

Primetals Technologies and partner thyssenkrupp Steel Europe have developed a new and groundbreaking vision-based strip-steering control …

Robust Backstepping Control for Cold Rolling Main Drive ...

The nonlinear model of main drive system in cold rolling process, which considers the influence with parameter uncertainties such as clearance and variable friction coefficient, as well as external disturbance by roll eccentricity and variation of strip material quality, is built. By transformation, the lower triangular structure form of main drive system is obtained.

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.

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 …

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 …

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.

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.

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.

Webinar Aluminum Rolling | Primetals Technologies

In this webinar we will look at one of the oldest and most diverse problems within aluminum cold rolling, that of 'coolant carryover'. And the subsequent impact wet strip from the exit of the cold mill has on product yield, quality and process inefficiencies. Based on current reference examples, solutions for achieving optimal strip dryness ...

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.

Dynamic modelling and simulation of a hot strip finishing mill

Introduction A hot strip mill rolls cast steel slabs into thin sheets. A typical hot strip mill facility consists of, in written order, the fol- lowing units: reheat furnace, roughing mill, transfer table, coilbox, crop shear, ﬁnishing mill, runout table and coiler. A layout of the plant is given in Fig. 1. The reheat furnace ensures that the ...

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 …

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.