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mills of ghana olivine
Roll Eccentricity Control for Strip Rolling Mills
01/07/1987 Eccentricity Estimator A number of measurements including roll force, measured exi t thickness and ro11gap position contain strong evidence of the presence of roll
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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
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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
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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
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ROLL ECCENTRICITY CONTROL WITH THE FORCE FEED CORE
ROLL ECCENTRICITY CONTROL WITH THE FORCE FEED FORWARD AGC SYSTEM . By Francis Wagner, Manager Rolling and Mill Automation. Abstract. The Force Feed Forward (FFF)
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H∞ Control system for tandem cold mills with roll
To meet this requirement, we have considered an output regulating control system with a roll-eccentricity estimator for each rolling stand of tandem cold mills.
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Strip Thickness Control of Cold Rolling Mill with Roll
12/11/2013 Cold Rolling Mill; Thickness Control; Roll Eccentricity; Fuzzy Neural Network; Eccentricity Compensation 1. Introduction Rolling strip is widely used for
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US4545228A Roll eccentricity control system for a
A roll eccentricity control system for rolling apparatus in which a period of each cycle corresponding to one revolution of the roll is divided into a plurality of sections, a deviation in thickness of the rolled material in each section is sampled during the rolling operation, the sampled deviations in the respective sections for at least one period are averaged to determine a period average
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Roll Eccentricity Repetitive Compensation Control Based on
Abstract: The roll eccentricity is one of main factors affecting quality of strip products. In order to improve product quality of strip, the roll eccentricity compensation control was studied. Sparse fourier transform was introduced for detecting roll eccentricity information, which is a complex high frequency periodic signal. And then a composite control scheme based on PI control and
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Methods To Control Eccentricity In Forged Rolls
ROLL ECCENTRICITY CONTROL WITH THE FORCE FEED FORWARD . 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 method. Furthermore, although FFF is an extremely cost-effective alternative to HAGC, this paper also demonstrates that the System can
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methods to control eccentricity in forged rolls
Gauge control using estimate of roll eccentricity The estimating of gauge and eccentricity, using control means associated with the mill, as described in detail hereinafter, is a continuing process until the cyclic component in exit gauge variations is reduced to a minimum or zero amount and the estimate of eccentricity reaches a steady state value representing the true eccentricity of the
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methods to control eccentricity in forged rolls
Generally existing eccentricity control methods can be classified into two types ; prevention and compensation.Fundamental Study of Roll Eccentricity Control using the,But, this method is known to worsen plate thickness accuracy by amplification of roll eccentricity effect which is an inner disturbance in hydraulic servo loop of screw down control. For this situation, at present, the method
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Roll Eccentricity Control Based on Recursive Estimation
Roll Eccentricity Control Based on Recursive Estimation Technique. Akira KITAMURA 1), Tetsuya TAKAHASHI 1), Kazuo NOSE 1), Masami KONISHI 1), Kousuke KIKUCHI 2) 1) Electronics Research Laboratory, Kobe Steel, Ltd. 2) Kakogawa Works, Kobe Steel, Ltd. Released 2011/10/13
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Study on Roll Eccentricity Control for Flat Rolling Mill
The main study in this paper are as follows:1) Study of roll eccentricity control model. Base on the analysis and class of roll eccentricity reason, one, tow and four roll eccentricity caused by rotary eccentricity, roller ellipse or both is analyzed in turn. Roll eccentricity law of all kinds of case consists of following:(1)Period of roll eccentricity signal; (2)Relationship between original
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H∞ Control system for tandem cold mills with roll
To meet this requirement, we have considered an output regulating control system with a roll-eccentricity estimator for each rolling stand of tandem cold mills. Considering entry thickness variation as well as roll eccentricity as the major disturbances, a synthesis of multivariable control systems is presented based onH∞ control theory, which can reflect the knowledge of input direction and
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Strip Thickness Control of Cold Rolling Mill with Roll
12/11/2013 Cold Rolling Mill; Thickness Control; Roll Eccentricity; Fuzzy Neural Network; Eccentricity Compensation 1. Introduction Rolling strip is widely used for automobile manufactur-ing, food packaging, household electric appliances, ma- chinery, light industry, instruments, communications, mil-itary affairs and other fields [1]. The design of a control-ler in the cold rolling system that can
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methods to control eccentricity in forged rolls MC World
Roll Eccentricity Control by Using a Bandpass Filter 9/1/2001 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
get price
Methods To Control Eccentricity In Forged Rolls
ROLL ECCENTRICITY CONTROL WITH THE FORCE FEED FORWARD . 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 method. Furthermore, although FFF is an extremely cost-effective alternative to HAGC, this paper also demonstrates that the System can
get price
roll eccentricity
Roll eccentricity control Irregularities in roll geometry cause periodic varia-tions in the roll gap, which can lead to variations in thickness of the rolled product. The predominant sources of these variations are the backup rolls of the stand. The function compensates for periodic disturbance from geometric asymmetries on the backup rolls. An automatic adaptation to compensate changes during
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Roll Eccentricity Repetitive Compensation Control Based on
Abstract: The roll eccentricity is one of main factors affecting quality of strip products. In order to improve product quality of strip, the roll eccentricity compensation control was studied. Sparse fourier transform was introduced for detecting roll eccentricity information, which is a complex high frequency periodic signal. And then a composite control scheme based on PI control and
get price
Study on Roll Eccentricity Control for Flat Rolling Mill
The main study in this paper are as follows:1) Study of roll eccentricity control model. Base on the analysis and class of roll eccentricity reason, one, tow and four roll eccentricity caused by rotary eccentricity, roller ellipse or both is analyzed in turn. Roll eccentricity law of all kinds of case consists of following:(1)Period of roll eccentricity signal; (2)Relationship between original
get price
methods to control eccentricity in forged rolls
Generally existing eccentricity control methods can be classified into two types ; prevention and compensation.Fundamental Study of Roll Eccentricity Control using the,But, this method is known to worsen plate thickness accuracy by amplification of roll eccentricity effect which is an inner disturbance in hydraulic servo loop of screw down control. For this situation, at present, the method
get price
Fundamental Study of Roll Eccentricity Control using the
03/03/2011 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 ability. By these studies, an economical analog correlation type roll eccentricity eliminator
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Roll Eccentricity Control Based on Recursive Estimation
Roll Eccentricity Control Based on Recursive Estimation Technique. Akira KITAMURA 1), Tetsuya TAKAHASHI 1), Kazuo NOSE 1), Masami KONISHI 1), Kousuke KIKUCHI 2) 1) Electronics Research Laboratory, Kobe Steel, Ltd. 2) Kakogawa Works, Kobe Steel, Ltd. Released 2011/10/13
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Application of Repetitive Control to Eccentricity
Repetitive control is applied here to compensate for roll eccentricity disturbances in thickness control of the cold rolling process. A unique aspect of the process is that the eccentricity disturbance may be from multiple rolls and hence may be composed of multiple periodic components whose periods may not be commensurate, namely, divisible by a common factor an integral number of times.
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methods to control eccentricity in forged rolls MC World
Roll Eccentricity Control by Using a Bandpass Filter 9/1/2001 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
get price
Calender Gauge Control Tips FACTS Inc.
Calender Roll eccentricity or run out at ambient temperature Bearing condition Roll water passage condition Roll end actuator condition Calender Roll Grind Profile The calender rolls must be ground periodically to establish the proper profile. The profile is selected so that the roll separating forces, which cause the rolls to bow apart in the center, are partially compensated for by grinding
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