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Hot Rolling Long. Rod Mill Equipment; Hot Rolling Flat. Hot Strip Mill; Plate Mill; Steckel & Plate Steckel Mills; ... Roll Eccentricity Expert Elimination of a known strip thickness quality disturbance from rolls. ... fewer roll changes—compensates backup-, intermediate- and work roll eccentricities;
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Plate Mills. To meet the needs of the aluminum market, our hot mill solutions feature a range of common technological enhancements to increase performance, operability, safety, and surface quality. These …
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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. ... Advantages arising from the design are suitability for hot and cold 4-high rolling mills, …
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then the process is termed as hot rolling. The hot mills using plain rolls were already being employed by the end of the seventeenth century. But the industrial revolution in the nineteenth century saw a new horizon in ... Roll Eccentricity Control Methods Passive roll eccentricity control methods Active roll eccentricity control methods
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in the cross-roll piercing mill, most seamless tube plants lack the monitoring at the hot piercing stage but only inspect the quality of finished tubes using ultrasonic testing (UT) at the end of all manufacturing processes. This paper develops an online monitoring tech-nique to detect abnormal conditions in the cross-roll piercing mill. Based ...
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Rolling of steel in Hot Strip Mill. satyendra; December 3, 2015; 2 Comments ; ... 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. The gap between the rolls can be changed by axial shifting of ...
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Elimination of a known strip thickness quality disturbance from rolls. Improved strip quality, improved thickness tolerances also at high rolling speeds. Maintenance-friendly: uses …
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The hot rolling mill environment is quite harsh, so the X-ray thickness gauge is placed a few meters away from the roll gap. The dead time can be calculated from the distance between the work ...
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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. The increasing demands on the …
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Hot rolling mill thus helps in reducing the size of a metal thereby molding it into the desired form and shape. Rolling mills perform the function to reform the metal pieces such as billet and ingot whilst maintaining its well equipped micro structure into bar, wire, sheet, strip, and plate. ... Definition and Causes of Roll Eccentricity Design ...
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Awtm/ia Abstract: An in-depth review of the roll eccentricity control design problem is provided which encompasses a number of recent, novel, design contributions …
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In order to implement a decoupling control, we modified the parameters and structure of the AGC system in a hot rolling mill. In rolling mill, the accuracy and quality of the strip exit thickness are very important factors. ... we propose roll eccentricity compensation by using Fuzzy Neural Network with online tuning. Simulink model for the ...
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Although eccentricity is mainly caused by abnormal process conditions in the cross-roll piercing mill, most seamless tube plants lack the monitoring at the hot piercing stage but only inspect the ...
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This brief proposes a robust subspace-aided fault detection approach for rolling mill processes with roll eccentricity. The novelty of this brief relies on the closed-loop identification of the so-called data-driven realization of the stable kernel representation (SKR) of the rolling mill process. In order to ensure an accurate and robust closed-loop …
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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 nonuniform thermal expansion of the rolls. The increasing demands on the thickness tolerances …
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This study seeks to improve the strip thickness accuracy by adding filter and compensator in strip rolling mills. Based on wavelet packet de-noising theory, this paper designed a wavelet packet analyzer of roll eccentricity (WPARE) to eliminate noises and useless frequencies in rolling force signal. By combining WPARE with a compensator, …
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A vibration monitoring method of strip rolling mill based on the digital twin model was proposed which could effectively reduce the structure complexity and test cost of the traditional monitoring system. Firstly, the coupling vibration mechanism model of the dynamic characteristics of roll system and bearings of four-high mill was established. …
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Roll-Eccentricity Compensation (REC) from Primetals Technologies rises to these challenges. It is a fully digital model-based control that models the shape of the …
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Wall-thickness eccentricity is a major dimensional deviation problem in seamless steel tube production. Although eccentricity is mainly caused by abnormal process conditions in the cross-roll piercing mill, most seamless tube plants lack the monitoring at the hot piercing stage but only inspect the quality of finished tubes using …
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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 multi-resolution wavelet transform algorithm was proposed to compensate for the roll eccentricity. The wavelet transform method had good localization characteristics in …
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Third-octave mill chatter, typically occurring in a frequency range between 90 Hz and 150 Hz, is a self-excited vibration phenomenon that normally takes place in the final stands of tandem cold-rolling …
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The hot rolling technology is the most widely used method of shaping metals and is particularly important in the manufacture of steel for use in construction and other industries. In metalworking, rolling is a metal forming process in which metal stock is passed through a pair of rolls. Rolling is classified according to the temperature of the metal rolled.
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This paper is concerned with the active compensation of the roll eccentricity-induced periodic disturbances in the strip exit thickness of hot and cold …
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The algorithm is proved applicable to eccentricity compensation of modern rolling mill by simulation and field experiment, and can improve the thickness quality. Keywords: …
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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 thickness control. The improved system has been validated by measurements. Future improvement options are also analyzed, like eccentricity …
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– 99 – P. Kucsera et al. Hot Rolling Mill HGC Thickness Control Improvement Figure 6 Effect of roll eccentricity on output strip thickness Figure 7 Thickness control loop with eccentricity thickness deviation as a disturbance The hot rolling mill environment is quite harsh, so the X-ray thickness gauge is placed a few meters away from the ...
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The key equipment in hot/cold tandem rolling mills is the finishing mill group, which usually consists of 7 mill stands in hot rolling and 5 mill stands in cold rolling.
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These studies had concentrated to improve the mill stretch design and the rolling speed control in order to accomplish fine thickness with respect to the compensation of the roll eccentricity and ...
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model, roll eccentricity modifies Equation (5) as [12]: h = S + F + e (7) out M where e is the roll eccentricity. IV. DESIGN OF THICKNESS CONTROL WITH ROLL ECCENTRICITY COMPENSATION The block diagram of exit thickness control with roll eccentricity compensation is shown in Figure 5. As an inner loop
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This paper deals with the parameter estimation and online monitoring of roll eccentricity in rolling mills. Roll-eccentricity-induced disturbances can result in strip thickness deviation and ...
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