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 …
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 ...
CiteSeerX — ROLL ECCENTRICITY CONTROL WITH THE FORCE …
CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): 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. Instead, using a revolutionary control algorithm, FFF has proven in five installations in North and South America, that steelmakers …
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 …
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 …
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.
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
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 …
(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
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.
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 ...
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
US4416134A - Process for manufacturing seamless metal ...
The present invention relates to the manufacture of seamless metal tubes by a cross-roll helical rolling process such as Mannesmann mandrel mill process or by a press piercing process such as Ugine Sejournet process. Shells being worked are subjected to outside-diameter reduction by means of a rotary mill having 3 or 4 rolls, without using internal tools such as plug and …
Parameter Identi cation and Filter Design for a Repetitive ...
eccentricity in the rollers, are present inherently in hot rolling mills and their attenuation is achieved by introducing new systems to the milling stands. Hence, the enhancement of the product quality for hot rolling mills is a continuous demand. Hot rolling mills are machines where hot rolling process is realized and rolling is a metal ...
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 …
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 ...
The development of the theory of metal rolling and its ...
The control of rolling is done by a machine, or rolling mill. From a control point of view it is necessary to study the combined behavior of machine and metal deformation to find the variables that may be used to most effectively regulate the process. A typical problem in this area is to control the output thick-
GB2059316A - Temperature control in hot strip mill ...
GB2059316A GB8029087A GB8029087A GB2059316A GB 2059316 A GB2059316 A GB 2059316A GB 8029087 A GB8029087 A GB 8029087A GB 8029087 A GB8029087 A GB 8029087A GB 2059316 A GB2059316 A GB 2059316A Authority GB United Kingdom Prior art keywords workpiece temperature change mill spray Prior art date Legal status …
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 thickness while PD controller is ...
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 …
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 ...
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.
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.
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...
H∞ Control system for tandem cold mills with roll eccentricity
Firstly this paper proposes a lumped-parameter hot-rolling mill model. The rolling mill examined is reversible and equipped with an independent speed control system for each work roll (two single ...
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
Nonlinear control of the HAGC by backstepping with ...
Controlling the hydraulic automatic gauge control (HAGC) of cold reversible rolling mill is a significant engineering challenge ...,the unifiedgauge-tension control problem isformu- ... roll. In addition, the compensation for the roll eccentricity using the Fuzzy neural network with the in-line adjustment is proposed.
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.
H∞ Control system for tandem cold mills with roll ...
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 well as roll eccentricity …
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.
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.