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hot rolling mill roll eccentricity

Active compensation of roll eccentricity in rolling mills

The roll eccentricity in a rolling mill may define the limit of achievable thickness tolerances and thus is subject of interest for the automation equipment in hot rolling mills as well as in cold

GENERAL ASPECTS OF ROLL COOLING FOR HOT and COLD ROLLING MILLS

rolling mill dedi ed roll cooling systems are required to fulfill the required functions. Examples are suitable roll cooling and lubri ionsystems to fully utilize the advantages of HSS rolls in hot strip mills and selective roll cooling systems as a method to control the flatness of the strip in cold rolling mills.

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

Hot Rolling Mill Hydraulic Gap Control HGC thickness

Schematic structure of a hot rolling mill The thickness of the rolled material is measured by an X-Ray thickness gauge in the last pass. This measurement is possible within several meters distance from the roll gap therefore considerable dead time has to be taken into account in thickness control.

US3543549A - Rolling mill control for compensating for the

Roll eccentricity correction system and method US4038848A en * 1974-05-31: 1977-08-02: Hitachi Ltd. Method and apparatus for controlling eccentricity of rolls in rolling mill DE2605183A1 en * 1975-02-12: 1976-08-26: Hitachi Ltd: Means for controlling the thickness of the rolling in a 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.

hot rolling mill roll eccentricity

Active compensation of roll eccentricity in rolling 2002-8-6 · Abstract: This paper is concerned with the active compensation of the roll-eccentricity-induced periodic disturbances in the strip exit thickness of hot and cold rolling mills. The roll eccentricity may be caused by different reasons e.g. inexact roll grinding or See More

Roll Eccentricity Control for Strip Rolling Mills - ScienceDirect

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 fluctuations

Dave Knapp – TelePro Inc. - TelePro Inc. – Industrial

An encoderless roll eccentricity compensation system for rolling mills and sheet casters; Shop floor inventory and production tracking systems for hot rolled plate and coiled products and for sheet finishing operations; A standard hydraulic mill stand control product for rolling mills

METALS Improving quality and cost-efficiency in cold rolling

Roll eccentricity control Irregularities in roll geometry cause periodic vari-ations in the roll gap which can lead to variations in thickness of the rolled product. The function compensates for periodic disturbance from geo-metric asymmetries on the backup rolls. An auto-matic adaptation to compensate changes during rolling e.g. due to

hot rolling mill roll eccentricity - joerg-steinbach-preis.de

Jul 01 1987 · 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 fluctuations apparently small levels of

PDF Hot rolling mill hydraulic gap control HGC thickness

where S 0 is unload ed roll gap; F 0 is rolling force; M is the mill stiffness or mill modulus. The strip thickness reference has to be created first d uring the lock- on process by

Seamless steel pipe produces eccentricity uneven thickness

Large feed angles cause the head to be more parallel with the rolling cone of the roll. Improper roll speed will also affect the wall thickness accuracy. 4 Centering and heating of the tube blank. Centering hole eccentricity and uneven heating yin and yang will cause uneven wall thickness. 5 Stiffness structure and adjustment of the punch.

how to control eccentricity problem in hot rolling mill

Abstract This paper is concerned with the active compensation of the roll eccentricity-induced periodic disturbances in the strip exit thickness of hot and cold rolling mills. The roll eccentricity may be caused by different reasons like e.g. inexact roll grinding or nonuniform thermal expansion of the rolls.

Active compensation of roll eccentricity in rolling mills

This paper is concerned with the active compensation of the roll eccentricity-induced periodic disturbances in the strip exit thickness of hot and cold rol Active compensation of roll eccentricity in rolling mills - IEEE Conference Publi ion

Rolling of steel in Hot Strip Mill – IspatGuru

The rolling speed is set to allow the last stand to perform the final reduction at the finishing temperature between 820 deg C to 900 deg C so as to achieve certain mechanical properties in the hot rolled strip. The finishing mills roll the transfer bar in tandem meaning each bar is rolled through all the finishing stands at once.

Improvement of thickness tolerances in aluminium cold rolling

After the successful simulation study the control concepts were implemented on the two-stand 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.

Main Features of a modern Hot Strip Mill – IspatGuru

Roll eccentricity compensation – 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.

Neural network for identifi ion of roll eccentricity in

The roll eccentricity in a rolling mill may define the limit of achievable thickness tolerances and thus is subject of interest for the automation equipment in hot rolling mills as well as in cold rolling mills. Today& 39;s demand on thickness tolerances less than 0.8% require efficient methods for roll eccentricity identifi ion and compensation.

Multi-resolution wavelet method for roll eccentricity

In order to compensate the roll eccentricity in hot strip rolling process a multi-resolution wavelet transform method was proposed. This wavelet method has quiet good localization characteristic in both time domain and frequency domain. To eliminate frequency aliases inhered in Mallat algorithm an anti-aliasing algorithm combining fast Fourier transform FFT and inverse fast Fourier

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