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tension control method for a rolling mill

Tandem rolling mill tension control with speed ratio error ...

Rolling mill control for tandem rolling: : Clegg: 72/17: 4460852: Method of controlling mill motors speeds in a cold tandem mill: : Kondo et al. 72/8: 4292825: Gauge and tension control system for tandem rolling mill: : Morooka et al. 72/19: 4240147: Gauge control method and system for rolling mill: ...

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US Patent for Method of regulating tension/compression in ...

Method of regulating tension/compression in a multi-frame hot rolling mill, and a corresponding control system . Jan 10, 2000 - Alstom. The value of the rolling torque is measured at each frame through which a metal product passes, and the measurement is performed at the moment when said product reaches the following frame, at which point the ...

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Metal Rolling - Manufacturing Process

In a metal rolling process, rolls, stands, bearings, housing, motors, and other mechanical equipment are all a necessary part of the manufacturing operation. The place where all the equipment for metal rolling manufacture is set up is called a rolling mill. Rolling mills often vary in the type, number, and position of rolls.

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Synthesis of Tension Control Systems for Winders of Cold ...

In tension control systems, the node for dynamic compensation of disturbance caused by a change in the speed of the rolling stand of cold-rolled sheet mills can contain only one channel that compensates only for the dynamic component. The limitation of the disturbance component due to the inaccuracy in the operation of the indirect torque ...

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Automatic Tension Control in the Continuous Roughing …

10%An improved method for automatic tension control is developed. It involves combining speed-difference tension control during free rolling and static-current tension control during multi-stand rolling on three stands. A functional block diagram of the system implementing the method is considered.

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Tension control system for hot strip mills | IEEE ...

The looper control of a hot strip finishing mill is one of the most important control items in the hot strip rolling mill process. Loopers are placed between finishing mill stands and control the mass flow of the two stands. Another important action of the looper is to control the strip tension which influences the width of the strip. So it is very important to control both the …

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DIGITAL OPTIMAL CONTROL OF MULTI-STAND ROLLING …

In order to develop the optimal control algorithm for rolling mills, LQR method is first introduced for linear systems without delay. Then, incorporating the input and measurment delays into dynamical equations, the proposed controller is designed. 4.1. Classical LQR algorithm revisite Consider a linear system, described by x&=Ax+Bu (20)

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Interstand strip gauge and profile conrol - Danieli United ...

Hot strip mill tension control: : Edwards: 72/17: 3782153: METHOD AND SYSTEM FOR CONTROLLING A TANDEM ROLLING MILL: : Winchester: 72/9: 3566639: N/A: : Dornbusch: 72/11: 3406547: Automatic gage control and method of operating for rolling mill: : List: 72/8: 3313125: Flexible coupling: : …

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US6227021B1 - Control apparatus and method for a hot ...

a control apparatus for a hot rolling mill having a plurality of rolling stands, including a roll gap tension controller configured to control a roll gap of one of the rolling stands so that a...

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Automatic Tension Control in the Continuous Roughing Train ...

The automatic tension control system of the three-stand continuous roughing train of the 2000 hot-rolling mill at the Magnitogorsk Metallurgical Combine is analyzed. Deviations in interstand tension that are several-fold higher than the set values and inadmissible compression are detected.

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Control of strip tension in a rolling mill based on ...

The control target in the looper-tension control of (hot rolling mills) is to maintain looper angle and strip tension simultaneously at their desired values.

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US4507946A - Method and system for controlling an ...

In a method and a system for controlling an interstand tension in a continuous rolling mill having a looper provided between a pair of successive rolling stands and driven by a looper drive motor, a correction to the speed target value for the looper drive motor is determined in accordance with the deviation of a detected looper operating angle from an angle target value, …

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[PDF] A SURVEY OF THE LOOPER-TENSION CONTROL …

Abstract Looper and tension control is important in hot strip mills because it affects the strip quality as well as strip threading. Moreover, the most difficult challange in the controller design and control performance comes from the interaction between looper angle and strip tension. Disturbances from several sources also cause a deterioration in control performance, and …

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Tension and Thickness Control Strategy Analysis of Two ...

In order to lucubrate the rolling characteristic of the two stands reversible cold rolling mill and establish the tension and thickness control strategy, the steady-state characteristic simulating program was established using the steady-state continuous rolling theory. The influences of each factor on exit thickness under different tension control …

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Basics of Web Tension Control Summary

different methods of control be it either speed or torque. Lastly we will explore the different types of tension systems including: manual, open loop and closed loop. We will discuss different components and methods used in each, as well as the advantages and disadvantages. This section is intended to help the audience best select the system best

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[PDF] Shape control systems for Sendzimir steel mills ...

The paper compares and contrasts various controller possibilities and is intended to provide a "cookbook" of shape control tools and strategies for Sendzimir mills. Deals with the problem of shape (or flatness) control for Sendzimir 20-roll cold-rolling steel mills. Such mills, with a variety of shape actuators, offer the control engineer considerable choice in the configuration and …

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Rolling mill looper control system - Westinghouse Electric ...

The invention relates in general to interstand tension control apparatus for a rolling mill, and more particularly to looper control apparatus in a tandem or continuous hot strip rolling mill. The looper is a mechanism installed between any two stands, in a tandem mill installation.

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A neuro-fuzzy system for looper tension control in rolling ...

The plant model is a rolling mill that uses a looper for tension control . Tension is caused by the difference between the exit speed v 1 in stand one and the entry speed v 2 in stand two. Looper height is related to looper storage length by the mass conservation principle and can be empirically approximated by (1) H(t)= 1 α+β L(t).

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Dynamic control of tension, thickness and flatness in ...

Gauge and tension control for a tandem cold rolling mill represent a complex problem of interactive controls. Proven solutions are well established but still leave room for improvement. Latest techniques involve the use of pseudo mass-flow controls in addition to traditional feed-forward and feedback methods.

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Looper and tension control in hot rolling mills: A survey ...

Strip tension can be stabilized through precise looper angle control, because angle variation induces tension variation, but uncertainty due to changes in the material characteristics and the slip between roll and strip may make a conventional looper control system, such as the PI controller, unstable.

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Analysis of Startup Process and Its Optimization for a Two ...

The thickness control and tension establishing process of a five-stand tandem cold rolling mill (TCM) were analyzed using a linearization physical model based on dynamic tension differential equations and the thickness delay method by PHILLIPS . It is the origin of computer simulation of continuous rolling processes.

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Flatness control of strip in continuous hot rolling processes

methods and extends the life cycle of measurement device. To show the effectiveness of the self-tuning PI flatness control using the FlatSIL system, computer simulation is executed and the proposed control system is applied to a hot rolling mill in POSCO. 2 Flatness sensing system The inter-stand looper itself would have the same

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60 YEARS OF ROLLING MILL TECHNOLOGY By Ford B. Cauffiel

including hydraulic screwdowns, hydraulic roll bend, and tension control. This book does not focus on these specific rolling mill manufacturers and their various methods of manufacturing and patentability. My intent in this book is to show the modern rolling techniques that

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Robust Tension Control of Strip for 5-Stand Tandem Cold Mills

Tandem cold rolling process is a nonlinear complex system with external and internal uncertainties and significant disturbances. The improvement in the quality of the final output depends on the control strategy of centerline thickness and interstand tension. This paper focuses on interstand tension control problem in 5-stand tandem cold rolling mills.

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Technical Info. （Rolling Mill – Flat Products） | Steel ...

New Rolling Method of Reversing Cold Rolling. A reversing cold rolling mill has been suffering from such drawbacks as unrolled portions necessarily produced in head and tail ends reduce yield, and time consuming works including removing of coils, threading of the strip and holding of the strip with the tension reel, which result in decreasing productivity.

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Looper and tension control in hot rolling mills: A survey ...

An observer-based multivariable tension control, was developed to improve tension control accuracy at strip threading time and applied to aluminium hot rolling mills. The approach used control pairings such that the changing rolling speed of the upper stand controls strip tension while torque of a hydraulic looper controls looper angle; this ...

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Looper and tension control in hot rolling mills: A survey ...

A survey of tension control methods for rolling mills can be found in [5]. However, tension control in rolling mills is not directly comparable to tension control in slitting lines, since rolling ...

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Improvement of Accuracy for Gauge and Elongation Control ...

each other to establish desired tension values at the entry and exit sides of the mill. Under the tension conditions established by the above control systems, a desired elongation is realized by control-ling the rolling force of the mill by a hydraulic screw-down control system. 2.3 AEC for skin pass mill of continuous processing line

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Designing of Hot Strip Rolling Mill Control System

Aimed at the complex demand of hot strip rolling mill in practicing, the configuration of the coiler and the technological process is analyzed. The arithmetic of coiling tension and the control process is introduced. The frame of the tension adjusting system is given. The coiler control system hardware is designed. The system is designed scientifically with steady control and …

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A neuro-fuzzy system for looper tension control in rolling ...

The plant model is a rolling mill that uses a looper for tension control ( Fig. 1 ). Tension is caused by the difference between the exit speed v1 in stand one and the entry speed v2 in stand two. Looper height is related to looper storage length by the mass conservation principle and can be empirically approximated by (1) H (t)= 1 α+β L (t).

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Method of controlling a hot strip finishing mill ...

The method of controlling the hot strip finishing mill according to claim 1 or 2, wherein when detecting a tension of said rolled material on the basis of the actual values of said rolling force and of said rolling torque, an ith stand torque arm coefficient A 0i is calculated by substituting, into the following formula, an actual value ...

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CN104785542B - A kind of roughing mill tension …

The control method of tension force has tower-loop control and Looperless control, uses Looperless control in roughing district, in finish rolling district …

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Measured mill stretch characteristic | Download Scientific ...

Automated gauge control (AGC) system has taken a wide area of the recent studies that deals with hot and cold rolling mill. These studies had concentrated to …

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Technological control for cold rolling processes

AGC for foil mills Speed-tension optimization is used in foil mill appli-cations, since the strip thickness depends very closely on tension and rolling speed. In order to achieve maximized material throughput, the speed of the stand is increased until the strip tension has reached its control limit or the speed has reached a pre-

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Unified gauge-tension control in cold rolling mills: A ...

In this paper, the unified gauge-tension control problem is formulated by defining the exit strip thickness of stands and interstand tensions as controlled outputs. It is shown that cold rolling process can be described by a nominal model perturbed by an additive uncertainty. This model is used to design a robust tracking controller, based on H∞ control theory, to …

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