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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 multiresolution wavelet transform algorithm was proposed to compensate for the roll eccentricity.
Abstract: This paper is concerned with the active compensation of the rolleccentricityinduced periodic disturbances in the strip exit thickness of hot and cold rolling mills. The roll eccentricity may be caused by different reasons,, inexact roll grinding or nonuniform thermal expansion of the rolls.
Oct 18, 2017· ️First of all, Happy diwali to all my subscribers and viewers as well.️ Hello guys, I welcome you again in this new fresh topic. This topic is regarding the rolling process used for ...
Strip Thickness Control of Cold Rolling Mill with Roll Eccentricity Compensation by Using ... constraints can be a tedious and challenging problem in many control applications [2]. ... the high precision of strip thickness, various types of Automatic Gauge Control (AGC) methods have been developed for hot or cold mill processes. The British ...
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 .
An indepth 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.
Another control problem (besides the continuous caster) arising in the steel industry is the control of the exit steel thickness in a rolling mill. The diagram below shows the layout of a rolling mill, with thick steel going in one side, and thin steel coming out the other. Overview of the Example
and mass flow in hot rolling mills can be satisfied by proper control of the strip tension and looper angle. Figure 1 shows the tension and looper control in a typical finishing mill. Traditionally, looper angle control has been performed by changing the rotating speed of a main motor but there has been no tension feedback
ARTICS Cold Rolling Highquality process models for Cold Rolling Mills. Based on our consolidated experience in more than one hundred projects across the globe, Nidec Industrial Solutions has developed a vast array of functions based on autoadaptive mathematical models that optimize rolling schedule calculations in real time.
of hot and cold rolling becomes more easily manageable. Smart sensors, a new generation ... a new visionbased stripsteering control system for hotstrip mills. From the start of the development phase, the solution was intended to ... become a widespread problem over the coming years.
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 need not replace their ...
Automation and Control in Iron and Steel Industries eolss. thickness and flatness of strip in hot and cold rolling mills. ... Nearly twothirds of the total weight of rolled products consists of flat, and only one ..... roll eccentricity control, the modeling of hydrodynamics and chemical processes in a newly...
ROLL ECCENTRICITY CONTROL WITH THE FORCE FEED FORWARD AGC SYSTEM Francis Wagner, Manager Rolling Mill Automation Hatch Associates Consultants, Inc., Buffalo, NY, USA ABSTRACT: 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.
Abstract: This paper proposes the eccentric problem in the coiling process of cold rolling mills. The wavelets multiresolution control method is designed: A wavelets multiresolution controller is introduced in the control cycle of coiling tension control, whose purpose is to acquire the element caused by periodically change of the coiling ...
Advanced Process and Quality Control in Hot Rolling Mills Using Eddy Current Inspection Sven KLING, PRÜFTECHNK NDT, Ismaning, Germany Abstract. Eddy current testing is a common method for the surface inspection of semifinished products. The general trend today is to perform eddy current testing
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 ...
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.
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 ...
hot rolling mill roll eccentricity . hot rolling mill roll eccentricity ness in hot rolling mills can be aboutμπι and more. Roll eccentricities arise from axial deviationscontrol of the hydraulic piston and the active eccentricity. how to control eccentricity problem in hot rolling mill.
Mar 06, 1990· It has been discovered that variations in the thickness of metal strip entering and/or leaving a rolling mill resulting from cyclic conditions associated with coils of the strip that can be substantially reduced, if not eliminated all together, by direct application of the eccentricity control algorithm disclosed in Pat. Nos. 4,222,254 ...
Roll Eccentricity Control Methods ... The Instrumentation and Computer Control of Hot Mills Introduction Pyrometers Thickness Gaging Monitoring the Profile of Hotrolled Strip Measuring the Flatness of Hotrolled Strip ... The Complete Technology Book on Hot Rolling of Steel ...
Eccentricity in Rolling Mills Xu Yang, Member, IEEE, Hao Luo, Minjia Krueger, Steven X. Ding, and Kaixiang Peng ... and roll eccentricity problem is the ... used one in hot/cold rolling mills is ...
After the successful simulation study, the control concepts were implemented on the twostand cold rolling mill. In observation mode the functions for eccentricity and hardness compensation could be monitored and preoptimized in parallel to normal operation with no effect on the current operation of the mill.
9th INTERNATIONAL ROLLING MILL ACADEMY 59 November 2007 Glasgow, Scotland The lectures will be given by leading international experts in hot and cold mill control systems. As well as providing an indepth understanding of the theory they will also explain the practical issues of implementing rolling mill control systems.
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