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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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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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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 ...
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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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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 ...
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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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The eccentricity disturbance is modeled as white noise w_e driving a band-pass filter Fe. The input thickness disturbance is modeled as white noise w_i driving a low-pass filter Fi. Feedback control is necessary to counter such disturbances. Because the roll gap delta cannot be measured close to the stand, the rolling force f is used for feedback.
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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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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
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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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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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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.
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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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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.
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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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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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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 ...
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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 ...
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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.
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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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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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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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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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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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hot rolling mill roll eccentricity - Ezio. hot rolling mill roll eccentricity. Abstract This paper is concerned with the active compensation of the roll eccentricityinduced periodic disturbances in the strip exit thickness of hot and cold rolling mills The roll eccentricity may be caused by different reasons like eg inexact roll grinding or ...
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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
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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.
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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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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.
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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.
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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
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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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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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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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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.
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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
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