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  • Roll Eccentricity Control for Strip Rolling Mills ...

    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 hysteresis can ...

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  • ROLL ECCENTRICITY COMPENSATION (REC)

    Rolls in rolling mills are never completely round but have eccentricity which can be caused by: • grinding inaccuracy • non-uniform 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 frequencies. Every roll of each roll stack can show such ...

  • (PDF) Hot rolling mill hydraulic gap control (HGC ...

    In this article the AGC (Automated Gauge Control) system, of a hot rolling mill is analyzed and different methods are described to improve its performance. The mill stretch compensation and other ...

  • Hot Rolling Mill Hydraulic Gap Control (HGC) thickness ...

    Control; Mill stretch compensation; Roll eccentricity compensation; Thickness control; Adaptive; Predictive control 1 Introduction Nowadays, the competitive nature of different sectors (industry, agriculture, ) depends on technological improvements [1]. There is a growing demand for high accuracy in thickness control in metal rolling area. If the required accuracy of hot rolling mills can ...

  • Strip Thickness Control of Cold Rolling Mill with Roll ...

    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 improve ...

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  • hot rolling mill roll eccentricity - marktbewerkinginict.nl

    hot rolling mill roll eccentricity. 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 rolling mills. The roll eccentricity may be . Chat Online; akhmad dhani HOT Rolling. Apr 18 2011 • Schedule-Free-Rolling OptimizationFor ...

  • hot rolling mill roll eccentricity - marktbewerkinginict.nl

    hot rolling mill roll eccentricity. 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 rolling mills. The roll eccentricity may be . Chat Online; akhmad dhani HOT Rolling. Apr 18 2011 • Schedule-Free-Rolling OptimizationFor ...

  • Neural network for identification 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's demand on thickness tolerances less than 0.8% require efficient methods for roll eccentricity identification and compensation. This paper should present a solution for ...

  • 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 ...

  • hot rolling mill roll eccentricity - Hof van Hoeven

    ROLL ECCENTRICITY CONTROL WITH THE FORCE FEED ROLL ECCENTRICITY CONTROL WITH THE FORCE FEED FORWARD AGC SYSTEM Francis Wagner, Manager Rolling Mill Automation Hatch Associates Consultants, Inc., Buffalo, NY, USA ABSTRACT: The Force Feed Forward (FFF) System is the only hot strip mill AGC system in the world today which does not incorporate the

  • Fault diagnosis of roll shape under the speed change in ...

    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 ...

  • ROLL ECCENTRICITY CONTROL WITH THE FORCE FEED

    ROLL ECCENTRICITY CONTROL WITH THE FORCE FEED FORWARD AGC SYSTEM Francis Wagner, Manager Rolling Mill Automation Hatch Associates Consultants, Inc., Buffalo, NY, USA ABSTRACT: The Force Feed Forward (FFF) System is the only hot strip mill AGC system in the world today which does not incorporate the BISRA principle for gage control. Instead, using a revolutionary

  • Active compensation of roll eccentricity in rolling mills ...

    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 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 ...

  • 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 ...

  • Reducing thickness variation of hot rolled steel strip by ...

    Reducing thickness variation of hot rolled steel strip by non-circular back-up roll geometry T. Widmaier*1, T. Salmela1, P. Kuosmanen1, J. Juhanko1,P.Ka¨rha2 and J. Uusima¨ki1 Typically, back-up rolls in hot strip mills are equipped with sliding bearings and it is common to use a key that prevents relative motion between the conical sleeve and the roll shaft. The key groove causes ...

  • 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 ...

  • Reducing thickness variation of hot rolled steel strip by ...

    Reducing thickness variation of hot rolled steel strip by non-circular back-up roll geometry T. Widmaier*1, T. Salmela1, P. Kuosmanen1, J. Juhanko1,P.Ka¨rha2 and J. Uusima¨ki1 Typically, back-up rolls in hot strip mills are equipped with sliding bearings and it is common to use a key that prevents relative motion between the conical sleeve and the roll shaft. The key groove causes ...

  • hot rolling mill roll eccentricity - annasweethome.de

    Hot Rolling Mill Roll Eccentricity Ethiopia sea salt washing machine supplier list of countries by salt production this is a list of countries by salt production the four leading salt producers in the world india the united states ethiopia 100000 004 61 new get price salt machine manufacturers amp suppliers. Neural network for identification of roll eccentricity in . The roll eccentricity in a ...

  • Efficient Special Steel Mills from Primetals Technologies

    The ZR mill is a mill for cold rolling of hot-rolled coils of stainless steel and other hard materials to the designated product thickness and strip shape accuracy. The ultra-small diameter rolls are firmly supported in a 20Hi roll cluster arrangement. With a conventional ZR mill, the roll bending mechanism for the backing bearing shafts that control the shape (the AS-U system) contains only ...

  • Rolling Mill Tutorial - Part 5 - University of Newcastle

    Rolling Mill Tutorial - Part 5. Before continuing, make sure you have read Section 21.11: 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, this model is chosen to be a single sinewave of ...

  • Upgrading of Hot Finishing Mill to 4-Stands, and ...

    The hot rolling mill of the Fukui Works went into service in May, 1983 as a world-class facility, equipped with large rolling stands capable of producing wide, large-diameter coils and featuring the latest in computer control. Since then, continuing improvements have been made in re-sponse to increasing demand for aluminum strip products--particularly can stock--and users' requirements for ...

  • Online Eccentricity Monitoring Weihong Guo of Seamless ...

    Online Eccentricity Monitoring of Seamless Tubes in Cross-Roll Piercing Mill 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 ...

  • LQG Regulation: Rolling Mill Case Study - MATLAB ...

    The goal is to regulate the horizontal and vertical thickness of the beam produced by a hot steel rolling mill. This example is ... disturbance model Fix = tf(1e4,[1 0.05],'inputn','w-ix') % Rolling eccentricity model Fex = tf([3e4 0],[1 0.125 6^2],'inputn','w-ex') % Gain from force to thickness gap gx = 1e-6; Next build the open-loop model shown in Process and Disturbance Models. You could ...

  • Roll Eccentricity Phase Identification System Scientific.Net

    Roll eccentricity signal is difficult to directly measured, should fuse many kinds of detectable signal to be extracted through the data analysis which includes rolling force, roll gap, incoming thickness of rolled piece, exit thickness, tension, and so on. This paper puts the four high mill as an object, according to the influence of the main factors of roll eccentricity ——backup-roll ...

  • LQG Regulation: Rolling Mill Case Study - MATLAB ...

    The goal is to regulate the horizontal and vertical thickness of the beam produced by a hot steel rolling mill. This example is ... disturbance model Fix = tf(1e4,[1 0.05],'inputn','w-ix') % Rolling eccentricity model Fex = tf([3e4 0],[1 0.125 6^2],'inputn','w-ex') % Gain from force to thickness gap gx = 1e-6; Next build the open-loop model shown in Process and Disturbance Models. You could ...

  • Roll Eccentricity Phase Identification System Scientific.Net

    Roll eccentricity signal is difficult to directly measured, should fuse many kinds of detectable signal to be extracted through the data analysis which includes rolling force, roll gap, incoming thickness of rolled piece, exit thickness, tension, and so on. This paper puts the four high mill as an object, according to the influence of the main factors of roll eccentricity ——backup-roll ...

  • FAULT DIAGNOSIS OF ROLL SHAPE UNDER THE SPEED CHANGE

    find both eccentricity magnitude and eccentricity location in the roll as shown in Fig.10. But, as shown in Fig.12, not only magnitude of eccentricity but also location of eccentricity in the roll is obtained. 4.2 Simulations with Field Data Fig.13 shows a simplified multi-stand hot rolling system. The rolling system consists of seven stands.

  • Rolling (metalworking) - Wikipedia

    Slabs are the feed material for hot strip mills or plate mills and blooms are rolled to billets in a billet mill or large sections in a structural mill. The output from a strip mill is coiled and, subsequently, used as the feed for a cold rolling mill or used directly by fabricators. Billets, for re-rolling, are subsequently rolled in either a merchant, bar or rod mill. Merchant or bar mills ...

  • Seamless steel pipe produces eccentricity (uneven ...

    27/03/2019  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.

  • Loop monitoring and assessment of hot strip mill control

    casted steel slabs and rolled in two stands down to desired thickness. The first stand is a conventional roughing mill. The last stand is a steckel mill. It is a special rolling technique that is only used in a small number of hot strip mills in the world. When this special technique is used, the demand on the control is

  • 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 ...

  • Non-circular grinding of backup rolls to reduce rolling ...

    A common structure in hot strip mill backup roll bearings is to attach the conical sleeve of the slide bearing to the roll’s shaft by a key. The key groove, cut to the conical sleeve, locally causes deformation under load. This sleeve spring is observed as rolling force variation. A new method to minimize force variations, based on 3D grinding of the backup rolls, was developed. A non ...

  • Reducing thickness variation of hot rolled steel strip by ...

    Typically, back-up rolls in hot strip mills are equipped with sliding bearings and it is common to use a key that prevents relative motion between the conical sleeve and the roll shaft. The key groove causes deformation of the sleeve under load. This sleeve 'spring' is observed as rolling force variation, which causes systematic thickness variation of the steel strip. Although there is a ...