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 ...
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.
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 ...
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 ...
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 ...
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, …
Minimum Tension in a Merchant Bar Rolling Mill using ...
A non-linear state-space process nlodel which represents the mill dynamics has been developed, and a control scheme is proposed which incorporates an Extended Kalman Filtt:r for estimation of bar tension, and optimal state feedback to provide appropriate control action. The bar tension estimation method is evaluated using measured lnill data.
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.
Design of Multiple Model Adaptive Controller for Tension ...
On the tension elongation control system of temper mill in cold rolling thin gauge product line, the roll diameter of coiling always varies. The electromechanical time constant in the tension system model is varies with the nonlinear law. So this paper proposes a piecewise multiple model switching adaptive control method, which can solve the defect problem of the …
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 …
[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 …
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 …
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.
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 …
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 …
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
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-
Research on the tension control method of lithium battery ...
The tension control mode of rolling mill can be divided into open-loop control and closed-loop control according to different processes. The open-loop control lacks the corresponding feedback link. By analyzing the tension change law of the winding and unwinding part in advance, the fixed rolling mill control strategy is set up.
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 …
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 ...
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 …
Article Details
The step response of the tension and speed model of TSR mill was adopted as the nonparametric model, an optimization controller was designed to control the tension by regulating the speed of roller. Meanwhile, considering the constraints of actual production, we used Particle Swarm Optimization (PSO) algorithm for rolling optimization of the ...
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 …
Hot strip width control method by using looper tension ...
In order to solve the above problems, a state feedback H∞ control method based on a discrete-time model for looper-tension control systems in hot rolling mills is presented.
Control of Strip Tension in a Rolling Mill Based on ...
Choi et al. (2007a) advocate the use of linear model predictive control (MPC) for loopers and strip Strip Mill stand tension as this control approach facilitates a systematic consideration of constraints and the multiple interactions between loopers and mill stands.
rolling mill torque calculation
The working roll diameter is 500 mm. Determine the rolling load on the rolling stand if the co-efficient of friction is 0.07. Also determine the rolling torque. Solution: Example 2: A billet of area of section 150 mm x 150 mm is rolled to 120 height in a rolling mill with 600 mm roll diameter at a temperature of 1100 °C at 3m/sec. get price
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 ...
Shape and Gauge Control of Strip in a Cold Rolling Mill ...
Fig 1 Thickness control in a single stand cold reversing mill. For the single stand cold reversing mill, the external controllers are (i) the tension control by torque (TCT) in which the entry / exit tensions are kept constant through the torque regulated by the TC that, in turn, exploits the motors applied to the coiler / uncoiler reels, (ii) the gauge control, feed-back via …
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.
Study on Rolling Characteristic and Flatness Control ...
Study on Rolling Characteristic and Flatness Control Characteristic of4-high Two-Stand Reversible Cold Rolling MillCN