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 ...
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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 ...
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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;
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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
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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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PURPOSE:To control accurately tension by performing estimate operation of tension between stands and also the component of torque due to load from the armature current, terminal voltage and number of revolution of drive motor for roll without use of rolling torque. CONSTITUTION:Because fluctuation of the component of torque due to rolling load is enough slow compared with fluctuation of ...
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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.
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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 ...
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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 ...
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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 ...
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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 ...
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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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For the speed and tension system of the reversible cold strip rolling mill with output constraints, parameter perturbations and load disturbance, a fixed‐time prescribed performance optimization ...
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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 ...
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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 ...
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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 ...
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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.
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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 ...
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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 ...
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PURPOSE:To surely prevent a fact that a draft position fluctuation caused by roll eccentricity of a backup roll is emphasized by tension constant control and transferred to a rolled stock, and to make the plate thickness accuracy satisfactory. CONSTITUTION:Tension of a steel plate S between a second stand and a third stand of a tandem rolling mill of four stands is detected by a tension gage 62.
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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 ...
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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
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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 ...
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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 ...
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Optimum strip tension control system for rolling mills USB1 (en) * : : Kabushiki Kaisha Toshiba: Strip threading speed controlling apparatus for tandem rolling mill ... Gauge control method and system for rolling mill USA (en) * : : , Ltd. Gauge and tension control system for tandem ...
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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.
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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 ...
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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 ...
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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 ...
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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).
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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 ...
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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 ...
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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 ...
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PURPOSE: To exactly control the interstand tension, by finding the tension value between the two stands from the tension value detected when the rolled material is gripped in the first stand and the tension value detected when the rolled material is gripped in the next stand, and by controlling the rolling speed depending on the deviation of the above mentioned interstand tension value from ...
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