Roll Eccentricity Control for Strip Rolling Mills
01/07/1987 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 enables the diverse range of published design solutions to be compared. The key conclusion from this
US4843854A Rolling mill roll eccentricity control
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
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
Strip Thickness Control of Cold Rolling Mill with Roll
12/11/2013 Strip Thickness Control of Cold Rolling Mill with Roll Eccentricity Compensation by Using Fuzzy Neural Network Waleed I. Hameed, Khearia A. Mohamad Department of Electrical Engineering, University of Basrah, Basrah, Iraq . Email: [email protected] Received November 12, 2013; revised December 12, 2013; accepted December 19, 2013
Roll Eccentricity Control by Using a Bandpass Filter
01/09/2001 Thickness deviations of the steel plates in the rolling mill process is mainly caused by the roll eccentricity of the back up roll (BUR). 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.
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 which applies wavelet transform method. Based on
CiteSeerX — ROLL ECCENTRICITY CONTROL WITH THE
@MISC{Wagner_rolleccentricity, author = {Francis Wagner and Manager Rolling and Mill Automation}, title = {ROLL ECCENTRICITY CONTROL WITH THE FORCE FEED FORWARD AGC SYSTEM}, year = {}} Share. OpenURL . 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. Instead,
US3920968A System for controlling eccentricity of
A system for controlling the eccentricity of a roll especially of a reversing mill such as a plate mill is disclosed wherein the eccentricity and phase of eccentricity of a roll are measured from the rolling pressure and applied as the correcting signal to a roll gap control unit so that the variation in thickness due to the eccentricity of the roll may be eliminated.
Online Monitoring System Design for Roll Eccentricity in
Abstract — This paper deals with the parameter es-. timation and online monitoring of roll eccentricity in. rolling mills. The roll eccentricity -induced disturbances. can result in strip t
A SURVEY OF THE LOOPER-TENSION CONTROL
CONTROL TECHNOLOGY IN HOT ROLLING MILLS set–up mismatch, skid marks, roll eccentricity and so on. However, while the hydraulic screw down system makes it possible to give quicker response to the AGC, it often creates a disturbance to the tension control system because of the mass flow change caused by roll gap movement. Another disturbance comes from the set–up mis-match. Before
US Patent for Rolling mill roll eccentricity control
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
how to control eccentricity problem in hot rolling mill
Roll Eccentricity Control for Strip Rolling Mills. 1987-7-1 SIMULATION RESULTS In eccentricity control, the following practical considerations apply to production rolling mills and thus should be cons idered in the des ign of relevant simulation studies: • the incoming feed can introduce periodic disturbances in the form of hot rolled thickness disturbances or uncoiler induced tension
Hot Rolling Mill Hydraulic Gap Control (HGC) thickness
Control; Mill stretch compensation; Roll eccentricity compensation; Thickness control; Adaptive; Predictive control 1 Introduction Nowadays, the competitive nature of different sectors (industry, agriculture, ) depends on technological improvements [1]. There is a growing demand for high accuracy in thickness control in metal rolling area. If the required accuracy of hot rolling mills can
JPH04313408A Roll eccentricity controller Google Patents
PURPOSE: To offer the roll eccentricity controller which can eliminate with high precision the influence exerted on a product profile caused by eccentricity of a pair of upper and lower backup rolls. CONSTITUTION: Each rolling load of a work side and a drive side is detected by rolling load detecting means 7W, 7D, and each rotation angle of the upper backup roll 4T and the lower backup roll 4B
Polynomial LQG control of back-up-roll eccentricity gauge
01/06/1994 The control of a rolling mill requires the output gauge to be regulated in the face of eccentricity and input hardness disturbances using measured roll-force. This is one of those control problems where it is not the measured variable which is controlled directly, but the measured variable is used to achieve control or regulation of another system variable, in this case the strip gauge. The
Roll Eccentricity Compensation Primetals Technologies
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.
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 thickness variation as
Method of measuring and compensating roll eccentricity of
an off-line eccentricity identification method which is performed when there is no plate rolling through the mill and with the top work roll and the bottom work roll in tight contact, said off-line eccentricity identification method determining the eccentricity values of N first points which equally divide a circumference of the top backup roll and N second points which equally divide a
A SURVEY OF THE LOOPER-TENSION CONTROL TECHNOLOGY IN HOT
CONTROL TECHNOLOGY IN HOT ROLLING MILLS set–up mismatch, skid marks, roll eccentricity and so on. However, while the hydraulic screw down system makes it possible to give quicker response to the AGC, it often creates a disturbance to the tension control system because of the mass flow change caused by roll gap movement. Another disturbance comes from the set–up mis-match. Before
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. With the help of a hardware-in-the-loop simulator, the com-plete rolling
how to control eccentricity problem in hot rolling mill
Fault diagnosis of roll shape under the speed variation in hot rolling mill. of Roll Eccentricity in Rolling Mills, Control in a Multi-stand Rolling Upgrading of Hot Finishing Mill to 4-Stands, and The hot rolling mill of the Fukui Works went into service in Roll eccentricity elimination control PC1: problems in high-load rolling, how to control eccentricity problem
Roll Eccentricity Control Using Identified Eccentricity of
Roll eccentricity is a periodic disturbance caused by a structure of back up rolls in rolling mills, and it affects product thickness accuracy. It cannot be measured directly by sensors, so it should be identified by measured thickness or measured roll force. When there is a large difference of diameters between top and bottom back up roll, the performance of roll eccentricity control using
Rolling Mill Control Device And Rolling Mill Control
A roll eccentricity control device includes: a filtering unit which filters exit-side plate thickness deviation of a material to be rolled detected by an exit-side plate thickness meter with a frequency corresponding to a period of rotation of a rolling mill and stores a result thereof in a filter table in association with a roll angle (phase); a correction unit which performs integration or
Roll Eccentricity Compensation Primetals Technologies
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.
Method of measuring and compensating roll eccentricity of
A method of correcting the thickness variations of a rolling plate by controlling at least one of the top or bottom backup rolls of a rolling mill. The method further comprises an off-line eccentricity identification method, and an on-line eccentricity compensation method. The off-line eccentricity identification method is utilized for establishing an eccentricity vector which stores the
how to control eccentricity problem in hot rolling mill
Automatic Gauge Control of Plate Rolling Mill,the production of a hot-rolled plate calls for high accuracy in,Eccentricity Comp Work Roll Bending Mill ModulusAnother control problem,The diagram below shows the layout of a rolling mill,,Solution of eccentricity problem:Jan 13, Apparatus for the detection, measurement and display of roll and roll bearing eccentricity in a rolling mill
how to ntrol eccentricity problem in hot rolling mill
Rolling mill roll eccentricity control Kaiser Aluminum . 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 compensated and a rolling speed dependent adaptive PI controller is developed to accomplish fine
rolling mill roll eccentricity control
Roll Eccentricity Control for Strip Rolling Mills . 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 A unifying approach to eccentricity control enables the diverse range of published design solutions to
how to control eccentricity problem in hot rolling mill
ROLL ECCENTRICITY CONTROL WITH THE FORCE . ROLL ECCENTRICITY CONTROL WITH THE FORCE FEED FORWARD AGC SYSTEM Manager Rolling and Mill Automation 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 Instead, using a revolutionary control algorithm,
Method of measuring and compensating roll eccentricity of
an off-line eccentricity identification method which is performed when there is no plate rolling through the mill and with the top work roll and the bottom work roll in tight contact, said off-line eccentricity identification method determining the eccentricity values of N first points which equally divide a circumference of the top backup roll and N second points which equally divide a
