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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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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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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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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The resulting system exhibits improved tolerance for imperfect stand speed control. Method for controlling tension in a metal rolling mill Download PDF
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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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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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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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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 ...
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The control target in the loopertension control of (hot rolling mills) is to maintain looper angle and strip tension simultaneously at their desired values.
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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 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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The shape control method of a rolling mill is desired. In the tandem rolling mill, the shape of the strip at the end of the final stand is. (a) The change of the profile of the cross section of the rolling material by the entrance side of a 1st stand by changes, such as a charging slab or a coil. (b) Change in roll spacing of each stand due to ...
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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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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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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 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 ...
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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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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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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 ...
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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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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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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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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 ...
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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 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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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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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 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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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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