Abstract. This article discusses the stages of tuning and adjustment of tension control systems for winders of coldrolled sheet mills using experimental frequency identification of the control object. To successfully solve the problems of synthesis of a control system by frequency methods, initial structures of the control object have been ...
The resulting system exhibits improved tolerance for imperfect stand speed control. Method for controlling tension in a metal rolling mill Download PDF
In the control of the tension of a workpiece which is rolled by a tandem rolling mill, a tension control method for a rolling mill wherein the tension of a workpiece is controlled by a looperless tension control method employing no looper at the threading stage of the top end and at the tailout stage, and it is controlled by a tension control method employing a looper during the steady rolling.
Looper and tension control, shown in Fig. 2, is important in hot strip mills because they affect both the dimensional quality and the mass flow of a strip. The high strip tension between stands induces width shrinkage, thickness reduction and moreover can produce an edge wave on a strip. However, it does make the mass flow more stable and hence ...
The control by which a tension is generated on the material to be rolled on the entry side and the exit side of the rolling mill 1 and the control of the roll gap of the rolling mill are exerted in an appropriate manner, thereby suppressing the vibration of the rolling mill exit thickness. A transferring speed of the material to be rolled is controlled by: controlling a transferring speed of ...
When the shear is cutting the trailing end of the workpiece, a backward tension is produced between the shear and the first rolling stand of the tandem rolling mill, resulting in abrupt variations of the process data used for the computation of the interstand tension.
The robust control methods which are Gaber et al. Journal of Engineering and Applied Science (2022) 69:100 Page 15 of 24 supposed to achieve the desired performance in the presence of disturbance/unmodeled dynamics are the socalled sliding mode control technique. ... Wang H, Zhang K, Yu C (2018) Looper and tension control in hot rolling mills ...
PROBLEM TO BE SOLVED: To provide a tension control method for a tandem hot rolling mill which can perform appropriate tension control even on a thick material such as one to be roughrolled, when a steel sheet is rolled by the tandem hot rolling mill. SOLUTION: In the method, the roll rotation speed on R4 rolling stand 12 is adjusted so that a ...
The invention discloses a tension detection and control method for a highspeed wire rod rolling mill, which is characterized by comprising the following steps of: s1, mounting a first laser rotation speed sensor and a second laser rotation speed sensor at the rotating rollers of the first rolling mill and the second rolling mill; s2, monitoring the rotating speed of the rotating roller ...
last finishing mill, the coiler entered the stage of tension control. Strip tensions are mainly provided between mandrel and pinch roll, between pinch roll and finishing mill. In order to make full use of the motor torque, the tension control system adopts the maximum torque method [2]. The basic control process is: when the mandrel
A tension control method for a rolling stock section located between a front roll stand and a rear roll stand of a rolling train, wherein a tensioning element with an actual adjusting force is adjusted relative to the rolling stock section, so that the rolling stock section is deflected by the tensioning element by an actual deflection; the actual adjusting force and the actual deflection are ...
From the series: Simulating a MultiStage Rolling Mill Process. This webinar is the third in a threepart series that highlights the use of MathWorks products for modeling and control of a multistage rolling mill process. In this webinar, you will learn how to design PID controllers for managing tension in a multistage rolling mill process.
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 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).
The looper control of hot strip finishing mill is one of the most critical control items in hot strip rolling mill process. It is a highly complex nonlinear system, with strong states coupling and uncertainty that present a difficult control challenge. Loopers are placed between finishing mill stands not only to control the mass flow of the two stands but also to generate a constant specific ...
Equations are derived for the normal roll pressure, specific roll load and torque in hot rolling mills, using the condition for plastic deformation in rolling derived by Orowan, together with von Kármán's equation of equilibrium. Although applying strictly to the rolling of ideal plasticrigid materials, these equations may be applied to the ...
In order to solve the above problems, a state feedback H∞ control method based on a discretetime model for loopertension control systems in hot rolling mills is presented.
PURPOSE: To prevent the hunching of interstand tension by adjusting the roll speed and draft position of stands so as to control only the forward tension without affecting backward tension. CONSTITUTION: The deviation between the output of a tension roll 8 between rolling rolls 2 and 3 and a reference value T1ref is determined. The deviation is inputted into a tension controller 13 to change ...
The control problem of the hotsteel rolling mill is thus formulated in two levels: (i) from to one computes the control inputs and that should be applied to the hotsteel roll mill system so as to assure that the angle of the looper and the tension on the strip will reach the desirable setpoints, (ii) the control inputs and become setpoints ...
The rolling force, rolling torque, incoming workpiece thickness and roll gap at a first rolling stand are detected when a workpiece is fed into the nip between the rolls of the first rolling stand to provide their reference values P 10, G 10, H 10 and S 10 which are stored in a memory, and the reference torque arm l 10 is computed on the basis of the reference values G 10 and P 10 of rolling ...
August 2429, 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 2729, 1040 Vienna, Austria (email: ) Abstract: A mathematical model of a striplooper ...
A looper control system has a looper that is interposed between two rolling stands of a tandem rolling mill and is actuated by a hydraulic actuator; and a control calculating section for calculating a speed change rate command value of a primary rolling machine and a pressure command value of a hydraulic looper actuator so that an interstand tension and a looper height can be both controlled ...
October 1998. A. Balestrino. Alberto Landi. Luca Sani. This paper deals with the application of advanced control techniques to improve the product quality in hot rolling mills. Performance ...
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 ...
An improved method for automatic tension control is developed. It involves combining speeddifference tension control during free rolling and staticcurrent tension control during multistand rolling on three stands. ... "Mathematical simulation of coupled electromechanical systems of the continuous train of a rolling mill. Part 3: Study of a ...
Subsequently, the tension is controlled by controlling the speed of revolution of a roller of the continuous rolling mill concerned so that the derived interstand tension becomes target tension. As a result, rolling is stabilized, the dimension accuracy of the material to be rolled 12 becomes satisfactory, and also, the yield can be improved.
To provide a tension control method for stabilizing a throughmaterial and improving product dimensional accuracy, by highly accurately controlling tension between a universal rolling machine and an edger rolling machine, without using a table value with every rolling : A tension control method controls a rotation speed of a second universal rolling machine so that a rolling ...
These results were nevertheless very encouraging for the authors of this article to use fuzzy logic to deal with the extreme complexity of the looperless tension control. 3. Fuzzy control scheme In general, the rolling force at each stand varies with change of strip temperature, roll eccentricity, and many other factors.
Abstract A mathematical model of a striplooper system of a hot strip tandem rolling mill is developed using Hamilton's principle and the Galerkin weighted residual method. Several nonlinearities are considered and the effects of bending and dynamic forces on the accuracy of the model are studied. Based on the model, an estimator for the strip tension is proposed. Finally, an impedance ...
The problem of achieving minimum bar tension in a merchant bar rolling mill without direct tension measurement is considered. A nonlinear statespace 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 action.
The invention provides a tension control method for a fivestand cold continuous rolling mill in a dynamic specification changing stage, which comprises the following steps of: all the stands decelerate in advance when the welding seam approaches the rolling mill, all the stands accelerate in a delayed way after the welding seam completely passes through the rolling mill, and the tension set ...
PURPOSE:To improve the control accuracy of tension between stands by a tension estimation equation by accurately finding the influence coefficient of the tension included in the tension estimation equation. CONSTITUTION:In the tension control method of a continuous rolling mill which controls by estimating the tension between an ith stand and an (i+1)th stand by using the tension estimation ...
In order to solve the above problems, a state feedback H∞ control method based on a discretetime model for loopertension control systems in hot rolling mills is presented.
By setting the fluctuation range of rolling tension, the control criterion to the drive system axis was obtained. Furthermore, the correctness of the theoretical analysis was verified through the engineering test of a 1780mm hot strip mill. ... Development of high performance rolling mill drive system using PID control method. Tran Sice Jpn ...
The invention provides a control method and a control device for racks of a tandem cold rolling mill. The method comprises the following steps: setting a load born by a fault rack as an initial value according to a virtual dummy signal of the fault rack; adjusting a tension value according to tension control grain coefficients, ensuring that the tension value is output to each standby rack in ...
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