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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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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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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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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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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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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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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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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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 control target in the loopertension control of HRM (hot rolling mills) is to maintain looper angle and strip tension simultaneously at their desired values.
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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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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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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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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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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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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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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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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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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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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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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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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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A material supplier from Belgium would like to produce limestone powder for his custome...
India is rich in various mineral resources and it is an important mineral processing market
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