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Rolling Mill Roll Eccentricity Control

Dec 03 2015 the technologies incorporated in a modern hot strip mill to in improve the product quality are i automatic gauge control ii automatic width control iii work roll bending iv continuous varying crown cvc and v roll eccentricity compensation cvc is a way to change the strip profile by using rolls with a profile.

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Rolling Technology And Theory For The Last 100 Years The

A new rolling mill with higher ability to control strip crownshape than conventional 4hi mills was developed in 1974 which was called hc mill 57 as this rolling mill with 6hi structure could made workrolls to be small the control characteristic of deformation shape of rolls was improved by shifting a middle roll in the width direction

Online Monitoring System Design For Roll Eccentricity In

Abstract this paper deals with the parameter estimation and online monitoring of roll eccentricity in rolling mills rolleccentricityinduced disturbances can result in strip thickness deviation and product quality degradation and a conventional control strategy cannot regulate this kind of periodic disturbances due to its complex

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

Fundamental Study Of Roll Eccentricity Control Using The

As roll eccentricity control method elimination method two types are studied the first is command method and the second is feedback method which lessens rolling mill stiffness by a control scheme for roll eccentricity frequency only the latter feedback method is proven to have sufficient control

Simulate For Cold Rolling Mills

Control strategy integrated control methods strip thickness monitoring control using a smithpredictor strip thickness and speed feed forward control mass flow control strip tension feed forward and feedback control coiler eccentricity compensation roll eccentricity compensation graphic displays simulateit for cold rolling

Rolling Of Steel In Hot Strip Mill – Ispatguru

Dec 03 2015 the technologies incorporated in a modern hot strip mill to in improve the product quality are i automatic gauge control ii automatic width control iii work roll bending iv continuous varying crown cvc and v roll eccentricity compensation cvc is a way to change the strip profile by using rolls with a

Strip Thickness Control Of Cold Rolling Mill With Roll

Doi 104236eng201461005 corpus id 30768077 strip thickness control of cold rolling mill with roll eccentricity compensation by using fuzzy neural network articlehameed2014striptc titlestrip thickness control of cold rolling mill with roll eccentricity compensation by using fuzzy neural network authorw i hameed and k mohamad journalengineering year2014

Lqg Regulation Rolling Mill Case Study

Feedback control is necessary to reduce the effect of these disturbances because the roll gap cannot be measured close to the mill stand the rolling force is used instead for feedback the input thickness disturbance is modeled as a low pass filter driven by white

Gauge Control Using Estimate Of Roll Eccentricity

Having thus described the invention and certain embodiments thereof what is claimed is 1 a method of controlling a rolling mill in which eccentricity of one or more of the roll assemblies of the mill and variations in thickness andor hardness of material entering the mill ordinarily cause variations in the gauge of the material that exits from the mill the eccentricity of the roll

Hampx221e 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 rolleccentricity estimator for each rolling stand of tandem cold

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

Roll Eccentricity Control For Strip Rolling Mills

Jul 01 1987 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

Roll Eccentricity Compensation Primetals Technologies

Maintenancefriendly uses existing thickness roll load or strip tension measurements as feedback for control hence easy to implement in existing basic automation environments no additional sensors or instrumentation necessary fewer roll changes—compensates backup intermediate and work roll eccentricities fast

Research On Mill Modulus Control Of Strip Rolling Agc

Mill modulus control mmc is one of important methods in the automatic gauge control agc systems of strip rolling mills related control theories and models were studied

Citeseerx — Roll Eccentricity Control With The

Moreover an fff installation requires only about nine 9 months after which time the system is fully operational at the specified gage performance one of the factors responsible for this high level of gage control is the unique method by which the system deals with the problem of roll stack eccentricity this paper describes that

Strip Thickness Control Of Cold Rolling Mill With Roll

Nov 12 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 waleedishaq5yahoocom received november 12 2013 revised december 12 2013 accepted december 19

The Engineering Design Of Rolling Mill

Oct 04 2019 a foil rolling mill rolls in subsequent long passesdue to the relative thin material coiled strip coiled on steel spool from a thickness of up to 06 mm coming from cold rolling mill down to 2 x 5 m the mill is designed in order to roll in closed

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

Unwindrewind Eccentricity Control For Rolling Mills

Rolling mill eccentricity compensation using actual measurement of exit sheet thickness 19870310 oliver et al 728 4545228 roll eccentricity control system for a rolling apparatus 19851008 yamaguti et al 728 4531392 phase compensator for gauge control using estimate of roll eccentricity 19850730 puda 7210

Strip Thickness Control Of Cold Rolling Mill With Roll

Rolling mill is the core equipment in modern iron and steel industry and the reliability of its mill roll system mrs is the key to ensure the rolling process with high precision high speed

Rolling Mill Tutorial

Rolling mill tutorial part 4 the sinusoidal variations in exit thickness are due to the fact that the rolls are not perfectly round but contain various bumps or imperfections these imperfections are known as the eccentricity of the roll eccentricity is a periodic signal since it will repeat each time the roll completes a

Rolling Mill Tutorial

Rolling mill tutorial part 5 before continuing make sure you have read section 2111 linear optimal filters observers to estimate roll eccentricity we view the output of the bisra gauge which is h e as the eccentricity e plus some noise before we can use an observer to estimate the roll eccentricity we need to model it as before

Advanced Reversing Cold Mills By Primetals Technologies

Rolling schedules can be carried out with an even or odd number of passes to maximize mill availability and performance the universal crown control mill ucm mill with work roll bending intermediate roll bending intermediate roll shifting and all straight roll application ensure enhanced flatness

Roll Eccentricity Compensation rec

Rolls in rolling mills are never completely round but have eccentricity which can be caused by • grinding inaccuracy • nonuniform thermal expansion • asymmetrical adjustment of bearing rolls shell via drive keys each eccentricity consists of a base frequency which is the rotary frequency of the roll and several harmonic

Top Pdf Hot Rolling Mill Process

Simulation studies have been conducted on several nonlinear process systems including a cold rolling mill model with roll eccentricity and a steel making system with real time oxyfuel slab reheating furnace control data the case study results demonstrate the computational efficiency of the proposed strategy in real time monitoring and control

Roll Eccentricity Phase Identification System

Study on roll eccentricity control for flat rolling mill doctoral dissertation of northeastern university 20081826 7 li daoping yao xiaolan wu qinghe etc adaptive threshold denoising algorithm of roll eccentricity signal the 1st international conference on

Aluminium Smelter Refinery Cold Rolling Mill

The implementation of additional control loops to compensate backup roll eccentricity and harmonic hardness variation automation modernization for alunorf cold rolling mill system 800xa and mp200 controllers upgrade with minimal production interruption and quick rampup to nominal

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 4high rolling mill or the like due to the selected thrust force applied axially to the ends or necks of

A Review On Chatter Analysis In Cold Rolling Process

Two work roll and two back up roll in addition to one degree of freedom system in order to appreciate the vibrations of rolling system was estimated numerically to deal with the chatter problem 6 a numerical solution to show the effect of friction condition in rolling bite on mill chatters five stand four high

Study On Roller Eccentricity Compensation In A Cold Mill

With the increase request of strip quality the roller eccentricity has become the important factor of influencing product quality on the practical model of coldrolling mill of 300 this paper establishes eccentricity compensation control practice of coldrolling mill of 300 which applies wavelet transform method based on muftiresolution decomposition of roll force signal by use of

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