Optimum strip tension control system for rolling mills. Optimum strip tension control system for rolling mills Abstract. A system and method for achieving an optimum interstand strip tension providing substantially equal loading of adjacent stands of a tandem rolling mill where such optimum tension is determined by the expression ##EQU1## where
Tension Control Method For A Rolling Mill For each project scheme design, we will use professional knowledge to help you, carefully listen to your demands, respect your opinions, and use our professional teams and exert our greatest efforts to create a more suitable project scheme for you and realize the project investment value and profit more
In a tandem rolling mill consisting of at least a first rolling stand and a second rolling stand, the interstand tension is controlled by the steps of detecting the rolling force P 10 and rolling torque G 10 at the first rolling stand after a workpiece is fed into the nip between the rolls of the first rolling stand but before the workpiece is fed into the nip between the rolls of the second
hot rolling mills. We thus consider tandem rolling mills equipped with loopers in this paper. Due to their easy setup, PI force controllers are still the most prevalent controllers for the position of looper rolls (Choi et al., 2007b). More advanced control systems use tension meters (Zhao et al., 2008) to measure the current strip tension.
Jul 01, 2007· An observer-based multivariable tension control,was developed to improve tension control accuracy at strip threading time and applied to aluminium hot rolling mills. The approach used control pairings such that the changing rolling speed of the upper stand controls strip tension while torque of a hydraulic looper controls looper angle; this
PURPOSE:To restrain a tension change on the inlet side of a stand and to prevent the accuracy of sheet thickness from being deteriorated by the oscillation by interference between plural tension control systems. CONSTITUTION:A draft position is corrected and the tension change on the inlet side is restrained in accordance with the tension change on the inlet side of the stand, the variation of
Rolling Mill Tutorial Control System Design. Rolling Mill Tutorial. Before continuing, make sure you have read Chapter 5. System Description. Another control problem (besides the continuous caster) arising in the steel industry is the control of the exit steel thickness in a rolling mill.
Aug 01, 1990· The problem of achieving minimum bar tension in a merchant bar rolling mill without direct tension measurement is considered. A non-linear state-space 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
Taper Tension for Rewind Control. Posted by Bryon Williams & filed under Article Library, Technical Papers.. Center winding film or other extensible material comes with inherent difficulties. If you maintain a constant tension on the web, as the diameter of the roll increases, the wraps become tighter.
Jul 01, 2007· An observer-based multivariable tension control,was developed to improve tension control accuracy at strip threading time and applied to aluminium hot rolling mills. The approach used control pairings such that the changing rolling speed of the upper stand controls strip tension while torque of a hydraulic looper controls looper angle; this
Jul 31, 1979· 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 tail-out stage, and it is controlled by a tension control method employing a looper during the steady rolling.
In order to solve the above problems, a state feedback H∞ control method based on a discrete-time model for looper-tension control systems in hot rolling mills is presented.
Rolling Mill Tutorial Control System Design. Rolling Mill Tutorial. Before continuing, make sure you have read Chapter 5. System Description. Another control problem (besides the continuous caster) arising in the steel industry is the control of the exit steel thickness in a rolling mill.
May 31, 2020· The Study of Continuous Rolling Mill Inter-stand Tension Inferential Control Systems Article (PDF Available) in Procedia Engineering 129:231-238
Aug 01, 1990· The problem of achieving minimum bar tension in a merchant bar rolling mill without direct tension measurement is considered. A non-linear state-space 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
Dec 17, 2009· Simulating a Multi-Stage Rolling Mill Process, Part 3: Tension Control. From the series: Simulating a Multi-Stage Rolling Mill Process. Alec Stothert, MathWorks. This webinar is the third in a three-part series that highlights the use of MathWorks products for modeling and control of a multistage rolling mill process. In this webinar, you will
Cascade control uses the reduction concept (R-Factor) to calculate the mill cascade speed reference. This parameter, directly related to rolling fundamentals, simplifies the setup and operator control. During production the loop and tension control automatically adjust the R- Factor, ensuring minimum material stress between the stands.
hot rolling mill roll eccentricity KINGFACT Heavy . 2020-4-7 · hot rolling mill roll eccentricity. Rolls in rolling mills are never completely round but have eccentricity which can be caused by • grinding inaccuracy • nonuniform thermal expansion • asymmetrical adjustment of bearing rolls shell via drive keys Each eccentricity consists of a base frequency which is the rotary frequency
Nov 27, 2015· Data collected at the end of a rolling with used rolls will not be accurate when rolling on new rolls. Tension control. In a continuous mill, speed matching the stand to achieve a constant mass flow through the mill assures a low cobble rate and fewer defects.
The thickness control and tension establishing process of a five-stand tandem cold rolling mill (TCM) were analyzed using a linearization physical model based on dynamic tension differential equations and the thickness delay method by PHILLIPS . It is the origin of computer simulation of continuous rolling
including hydraulic screwdowns, hydraulic roll bend, and tension control. This book does not focus on these specific rolling mill manufacturers and their various methods of manufacturing and patentability. My intent in this book is to show the modern rolling techniques that
Sep 01, 2016· Sheet Rolling Mill processes involve progressive thickness reduction of continuous sheet metal in multiple stages. Some of the control variables of interest are exit thickness, throughput and the tension in the sheet as it passes from one stage to the other.
Outline of reversing cold rolling mill and rolling method As illustrated in Figure 1, a reversing cold rolling mill is structured mainly of a mill proper, a winding machine (pay-off ree l), an entry winding machine (tension reel) and a delivery-winding machine (tension reel).
Dec 17, 2009· Simulating a Multi-Stage Rolling Mill Process, Part 3: Tension Control. From the series: Simulating a Multi-Stage Rolling Mill Process. Alec Stothert, MathWorks. This webinar is the third in a three-part series that highlights the use of MathWorks products for modeling and control of a multistage rolling mill process. In this webinar, you will
May 31, 2020· The inter-stand tension inferential control systems are used to stabilize the rolling motor torque. To stabilize the motor torque the electric drive system with the properties of the rolling motor.
The thickness control and tension establishing process of a five-stand tandem cold rolling mill (TCM) were analyzed using a linearization physical model based on dynamic tension differential equations and the thickness delay method by PHILLIPS . It is the origin of computer simulation of continuous rolling
Jun 19, 2017· The main methods of controlling the tension in the mill is with a tension free rolling speed control system and manually monitoring the current drawn by each motor as the bar proceeds through the mill. A looper table can be used to aid in keeping the bar tension free between stands.
Effective width-deviation compensation using tension control is limited to low-frequency width deviations. By default, the strip width in a hot-strip mill is deter- mined by edging and rolling the strip in
Sep 01, 2016· Models Sheet Rolling Mill processes involve progressive thickness reduction of continuous sheet metal in multiple stages. Some of the control variables of interest are exit thickness, throughput and the tension in the sheet as it passes from one stage to the other.
INTRODUCTION Interstand tension control is an important part of the process control in modern continuous wire rod mills. The interstand tension is a force, resulting from the increase in relative rolling velocity in successive stand and it affects mechanical properties of the product and mill performances.
One of these is a method such that rolling is carried out with no tensioning in a state in which the both ends of the material in the longitudinal direction are each released from the tension reel, and after that, reverse rolling is continuously continued by ho lding the material again with the tension reel1).
Rolling mill simulator A new platform for testing, analysis and optimization of cold rolling mills. Axel Brickwedde, Frank Feldmann, Nicolas Soler The cold rolling of flat metal products especially in tandem or multi-stand mills is a highly complex process where
The simplest and least expensive method of tension control is manual. They can be as simple as a potentiometer adjusting the torque output of a drive or magnetic particle brake or clutch or an air regulator adjusting the air pressure and therefore torque output of an air brake or clutch. This control method can be used in all three tension zones.
Rolls are tools used in rolling mills to reduce the cross section of metal stock. The weight of rolls may vary from a few kilograms up to 250 tonnes. Under rolling conditions the contact area between roll and stock suffers wear, the other parts of a roll -
each other to establish desired tension values at the entry and exit sides of the mill. Under the tension conditions established by the above control systems, a desired elongation is realized by control-ling the rolling force of the mill by a hydraulic screw-down control system. 2.3 AEC for skin pass mill of continuous processing line
Oct 24, 2017· An improved method for automatic tension control is developed. It involves combining speed-difference tension control during free rolling and static-current tension control during multi-stand rolling on three stands. A functional block diagram of the system implementing the method is considered.
AGC for foil mills Speed-tension optimization is used in foil mill applications, since the strip thickness depends very heavily on tension and rolling speed. In order to achieve maximized material throughput, the speed of the stand is increased until the strip ten-sion has reached its control limit or the speed has
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