Do not attempt this method of measuring tension if there is a drive motor on the unwind or for a rewind with a drive motor. Serious injury could result if this method of measuring tension is attempted when there is a drive motor at the unwind or rewind zone. • Tension can also be calculated if you know the model of a brake or clutch, the
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.
USA Tension control method for a rolling mill Google Patents Tension control method for a rolling mill Download PDF Info Publication number ... rolling process Methods title claims abstract description 198; acceleration Effects claims description 20;
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. ... T. Kataoka, H. Sasao and K. Yabuuchi, "A New Tension Control Method for Hot Strip Finishing Mill", IFAC 10th Triennial World Congress, pp. 114 ...
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 ...
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 ...
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 looper tension control methods are conventional, noninteractive, LQ (Linear Quadratic), H ... INTRODUCTION Hot strip mill finisher is a tandem rolling mill that reduces the strip thickness from 30(mm) to (mm) typically during hot state (1000 t ..... SOO CC). Strip width ranges 600 (mm) to 2200 (mm) typically, but width reduction ...
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 ...
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 ...
A looper tension control system is common to many rolling processes. Conventional tension controllers for mill actuation systems are based on a rolling model. They therefore cannot deal effectively with unmodeled dynamics and large parameter variations that can lead to scrap runs and machinery damage. In this paper, this problem is tackled by ...
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 ...
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 ...
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
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.
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 ...
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.
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 ...
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 ...
The invention relates to a tension control method for a rolling stock section (5) of a rolling stock (1) located between a front and a rear rolling stand (2, 3) of a rolling mill. In order to enable reliable tension control even with small stand spacings and high rolling speeds, it is provided that a clamping element (6) is set against the rolling stock section (5) with an actual contact force ...
The control target in the loopertension control of HRM (hot rolling mills) is to maintain looper angle and strip tension simultaneously at their desired values.
Tandem cold rolling is a highspeed, highefficiency, and complex production process. In some cases, minor interference or disoperation may result in large economic losses. To improve control performance and enhance system robustness, an optimal tension and thickness control method is presented in this paper.
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.
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 ...
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 ...
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 ...
Tension control device and control method for hot rolling mill Download PDF Info Publication number JPB2. ... hot rolling rolling mill tension control Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the ...
The resulting system exhibits improved tolerance for imperfect stand speed control. Method for controlling tension in a metal rolling mill Download PDF
tension control control method tension rolling Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired Lifetime Application number US05/892,180 Other languages English (en ...
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).
Control of Strip Tension in a Rolling Mill Based on Loopers and Impedance Control. A. Steinboeck G. Mühlberger A. Kugi. Engineering. 2014. 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.
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.
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