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
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 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 ...
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 ...
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.
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 …
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 …
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 …
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 ...
how does a tub grinder work
Tub Grinders - URC Recycling Equipment Sales. Tub grinders are equipment used for grinding down large pieces of wood. Construction companies and clean-up crews use tub grinders to clear parcels of land or to clean up after a storm in which branches or trees are blown down.
HOT ROLLING SURFACE QUALITY ISSUES1
plate/coil surface quality,(1) there are many reheating, hot rolling, cooling and handling processing points that influence final plate/coil surface quality. At the hot rolling mill, the reheating furnace operation and hot rolling mill can be the root cause of surface quality issues and/or poor mechanical properties including toughness. The
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 …
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 …
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 …
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 ...
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 …
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.
how does cement grinding unit function
how does the clinker grinding unit, learnpianoin a cement grinding unit total function deffination Cement mill what is the definition How Grinding Unit Cement . how does a grinding cement mill work - sbnshikshansansthan.in ... Control Problems ... In this way disturbances arising at a unit propagate to the ... Vol. XIX - Automation and Control ...
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.
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 …
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
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 ...
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-
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.
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 …
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.
FAULT DIAGNOSIS OF ROLL SHAPE UNDER THE SPEED …
find both eccentricity magnitude and eccentricity location in the roll as shown in Fig.10. But, as shown in Fig.12, not only magnitude of eccentricity but also location of eccentricity in the roll is obtained. 4.2 Simulations with Field Data Fig.13 shows a simplified multi-stand hot rolling system. The rolling system consists of seven stands.
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 …
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...