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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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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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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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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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 ...
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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 ...
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USA Control method of tension in rolling mills (1) Google Patents Control method of tension in rolling mills (1) Download PDF Info Publication number ... rolling process Methods title claims description 114; corresponding Effects claims description 58;
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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 ...
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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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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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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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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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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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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.
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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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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.
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The state key Laboratory of Rolling technology and Automation of Northeastern University (NEURAL) designed and manufactured a new pilot warm rolling mill that can achieve heating on line in the ...
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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.
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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 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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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.
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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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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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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.
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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 ...
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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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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 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 ...
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A material supplier from Belgium would like to produce limestone powder for his custome...
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