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eccentricity compensation. The Roll Eccentricity Expert is a fully digital model based control, which uses the fact that the eccentricity of each roll remains relatively constant during rolling to model its shape over several revolutions. Using an inverted plant model this modelled eccentricity is transformed into a compensation setpoint
A robust data-driven fault detection approach for rolling mills with unknown roll eccentricity. IEEE Trans. Control Syst. Technol. 2020, 28, 2641–2648. [Google Scholar] Peng, R.; Zhang, X.; Shi, P. Bearing fault diagnosis of hot-rolling mill utilizing intelligent optimized self-adaptive deep belief network with limited samples.
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 …
Elimination of a known strip thickness quality disturbance from rolls. Improved strip quality, improved thickness tolerances also at high rolling speeds. Maintenance-friendly: uses …
Active compensation of roll eccentricity in rolling mills. Abstract. This paper is concerned with the active compensation of the roll-eccentricity-induced periodic disturbances in the strip exit thickness of hot and … » More detailed! Gear Coupling manufacturer, exporters and supplier in Mandi …
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 ...
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 ...
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
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
This paper is concerned with the active compensation of the roll eccentricity-induced periodic disturbances in the strip exit thickness of hot and cold …
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 …
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 ...
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 …
roll eccentricity variation. We explain the need for FFAGC ... layout of the structure of the hot strip rolling mill.1) A delivery thickness signal usually consists of a low fre-quency component and several high frequency components. Fig. 2shows the frequency analysis of a general delivery thickness. These components are the results from different
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, …
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. …
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 …
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's demand on thickness tolerances less than 0.8% require efficient methods for roll eccentricity identification and compensation.
contribution thickness for a six-stand hot rolling mill range from 25 to 50 μm. Roll eccentricity may be caused by inexact roll grinding and non-uniform thermal expansion both leading to axial deviations between roll barrel and roll necks [7-8]. ... the relationship between roll eccentricity and rolling force variation [11]. The FFT
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 ...
Rolling mills for lead seem to have existed by the late 17th century. Copper and brass were also rolled by the late 18th century. Until well into the eighteenth century, rolling mills derived their power from water wheels.The first recorded use of a steam engine directly driving a mill is attributed to John Wilkinson's Bradley Works where, in 1786, a Boulton …
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.
Given that close to half of all steel produced is hot-rolled to strip, mills require maximum throughput and availability combined with geometrical precision and the ability to create optimum material properties. ... Roll Eccentricity Expert ... ISV Roll coolant spray bars for hot and cold rolling mill strip flatness control
LI Bo-qun, Application and Research of Synthetical AGC System in Hot Rolling Mill [D]. Beijing: University of Science and Technology Beijing, 2006 (in Chinese). HUANG Min, FANG Xiao-ke, WANG Jian-hui, et al. Roll Eccentricity Compensation Control for Strip Rolling Mills Based on Wavelet Packet De-Noising Theory [AJ.
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 …
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 …
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 …
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 ...
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 …
– 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 ...
A performance indicator based on product expectations or the empirical value of quality-related process variables, which can be quantitatively visualized with four zones, is proposed in the high level of parameter estimation and online monitoring of roll eccentricity in rolling mills. This paper deals with the parameter estimation and online …
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 …
A novel real-time fuzzy-based diagnostic system of roll eccentricity influence in finishing hot strip mills . × ... For instance, after the rolling of a strip, the mill operators may find that the thickness measured by the X-ray gauge at the exit of the FHSM is not up to the required quality. In this case, the operators must diagnose which ...