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

This paper focuses on interstand tension control problem in 5-stand tandem cold rolling mills. Tension dynamics can be described by a nominal model perturbed by parametric uncertainties.

The Study of Continuous Rolling Mill Inter-stand Tension ...

The most common method of making flat rolled products for large diameter pipes is rolling on plate reversible mills [1,2], as well as on continuous rolling mills [3, 4]. A special place is ...

US4137742A - Interstand tension control method and ...

In a tandem rolling mill consisting of a plurality of rolling stands, an interstand tension control method including the step of computing the interstand tension on the basis of the detected values of the rolling force and rolling torque detected at an i-th rolling stand (where i is an integer less by more than one than the total number of the ...

Control of Strip Tension in a Rolling Mill Based on ...

Proceedings of the 19th World Congress The International Federation of Automatic Control Cape Town, South Africa. August 24-29, 2014 Control of Strip Tension in a Rolling Mill Based on Loopers and Impedance Control A. Steinboeck G. M¨ hlberger A. Kugi u Automation and Control Institute, Vienna University of Technology, Gußhausstraße 27-29, 1040 Vienna, Austria (e-mail: [email …

Formula For Load Calculation Of Rolling Mill

Formula For Load Calculation Of Rolling Mill ... model is developed by using variational calculus method then combined with divided element method tension distribution and rolls deformation model are established and the corresponding procedure is, a ... rolling mills get a free quote speed cascade control system for bar and wire rod mills ...

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.

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

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 detected interstand tension value of a rolled material positioned between the adjacent rolling stands accords with a target interstand tension value thereof; and a tension width controller configured to ...

THE MECHANICS OF TENSION CONTROL

methods for doing this. • If you already have a load cell tension control, it normally has the ability to display actual tension in total pounds across the web. You can also purchase load cells with only a display (no control) if you would like to measure tension within any zone in your machine.

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

Methods for online measurement and control of section ...

In hot rolling of wire rod, bars and other long products in continuous rolling mills, the sectional deviations along a rolled material strand are affected by temperature and size [1]. To ensure a stable rolling process with constant product quality, it is …

Minimum Tension in a Merchant Bar Rolling Mill using ...

The problem of achieving minimum bar tension in a merchant bar rolling mill without direct tension measurement is considered. A non-linear state-space process model which represents the mill dynamics has been developed, and a control scheme is proposed which incorporates an Extended Kalman Filter for estimation of bar tension, and optimal state feedback to provide appropriate control …

tension measurement cold rolling mill

Cold Rolling Mills Strip Tension BLH Nobel. COLD ROLLING MILLS: STRIP TENSION High consistency in rolling mill operation requires a high accuracy in tension measurement The BLH Nobel strip tension systems for rolling mills measures the actual resultant strip tension force, as opposed to measuring the indirect force given by the electrical drives current, increasing measuring accuracy and ...

FUZZY TENSION CONTROL OF THE WIRE ROD ROUGHING …

tension. In general, rolling with low tension in roughing mill is a fundamental condition to ensure the stable rolling quality [2], [3]. This paper proposes the fuzzy control structure for the roughing mill in Slovakia Steel Mills, a.s. Strážske. The given roughing mill consists of six rolling stands (STD), individually driven by motors ...

CN104785542B - A kind of roughing mill tension …

The present invention relates to a kind of roughing mill tension adjustment control method, the method set in rolling by host computer required for the tension force that reaches, by master cpu by Real-time Collection rack level roller and the rolling load of edger roll and speed, calculate the actual tension of slab in frame, master cpu, according to actual tension and the deviation value of ...

The Integrated Robust Control of Interstand Strip Tension ...

We describe an integrated tension controller design for a tandem cold rolling mill in steel plants. To achieve stable rolling and ensure strip quality, it is very important to control the tension of the cold rolling mill. Previous researches examined only the operation of a single stand. But it is not sufficient to examine the operation and effect of whole stands because the operation is ...

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.

Control of Strip Tension in a Rolling Mill Based on ...

hot rolling mills. We thus consider tandem rolling mills equipped with loopers in this paper. Due to their easy setup, PI force controllers are still the most prevalent controllers for the position of looper rolls (Choi et al., 2007b). More advanced control systems use tension meters (Zhao et al., 2008) to measure the current strip tension.

how to control eccentricity problem in hot rolling mill

Rolling Mill Tutorial Before continuing make sure you have read Chapter 5 Another control problem besides the continuous caster arising in the steel industry is the control of the exit steel thickness in a rolling mill The diagram below shows the layout of a rolling mill with thick steel going in one side and thin steel An in-depth review of ...

GAGE CONTROL METHOD AND SYSTEM FOR TANDEM ROLLING …

In accordance with the present invention, a final gage control system and method for a tandem rolling mill are provided wherein final gage is varied by varying tension in the strip material being rolled between the last two stands while the roll force exerted on the strip by the last stand is maintained constant for all variations in last stand ...

MILL CONTROL SYSTEM AND METHOD FOR CONTROL OF …

Mill control system and method for metal strip rolling con­ ... I.S. Choi, J.A. Rossiter, andPJ Fleming, "Looper and tension control in hot rolling mills: A survey", Journal of Process Control 17 (2007), 509-521. Gerald Hearns Michael J. Grimble, "Robust Multivariable Control

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 meets demand of ...

Advanced Control for Hot Rolling Mills | SpringerLink

Summary. Hot strip rolling mills are characterised by a process which has many interactions, is distributed with dominant transport delays and has a lack of measurements due to the severe environment. There is ever increasing market demand for better product quality of the steel strip hence the requirement for higher performance controllers.

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

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, and the looper drive ...

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.

Non-interactive control for hot rolling mill using ...

This paper proposes an advanced method to reduce fluctuations of strip tension and looper position in a steel rolling mill. We design a non-interactive controller to decouple the looper system into two subsystems. However, these subsystems have uncertainties, disturbances and interactions with each other. In this paper we consider these uncertainties, disturbances and interactions as each ...

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).

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 ...

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 ...

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 ...

1. Hot rolling and rolling defects: 1.1 Front and back ...

Reducing the roll gap increases the roll pressure to p3. Gage control in multiple rolling mills is achieved through measurement of strip thickness using x-ray gage and adjusting the strip tension using feedback control system. 1.8 Rolling defects: Mill spring is a defect in which the rolled sheet is thicker than the required thickness because,

Tension and Thickness Control Strategy Analysis of Two ...

Cold Rolling Plant, Jinan Iron and Steel Group Co Ltd. j inan 250101, Shandong, China) Abstract: 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 ...