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DE102010013387B4 Control device and method for a rolling

The rolling mill control apparatus according to the present invention is a control apparatus for a rolling mill having tensioning rollers for feeding and winding up a rolling material at the entrance side and the exit side of the rolling mill. The control apparatus comprises a tension / speed control means for carrying out the control such that the tension between the tensioning roller and the

US4507946A Method and system for controlling an

In a method and a system for controlling an interstand tension in a continuous rolling mill having a looper provided between a pair of successive rolling stands and driven by a looper drive motor, a correction to the speed target value for the looper drive motor is determined in accordance with the deviation of a detected looper operating angle from an angle target value, and the looper drive

Looper and tension control in hot rolling mills: A survey

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

US4292825A Gauge and tension control system for tandem

A gauge and tension control system for a tandem mill comprises a delivered strip thickness deviation calculating unit for detecting output strip thickness at each of rolling stands, a tension calculating unit for arithmetically determining interstand tensions between two adjacent rolling stands on the basis of armature currents of drive motors and rolling loads at every rolling stand, a memory

Automatic Tension Control in the Continuous Roughing Train

Oct 24, 2017 高达10%返现 The automatic tension control system of the three-stand continuous roughing train of the 2000 hot-rolling mill at the Magnitogorsk Metallurgical Combine is analyzed. Deviations in interstand tension that are several-fold higher than the set values and inadmissible compression are detected.

Tension and Thickness Control Strategy Analysis of Two

Oct 01, 2012 Cold Rolling Plant, Jinan Iron and Steel Group Co Ltd. j inan 250101, Shandong,China) Abstract: In order to lucubrate the rolling characteristic of the two stands reversible cold rolling mill and establish the tension and thickness control strategy, the steady-state characteristic simulating program was established using the steady-state

1. Hot rolling and rolling defects: 1.1 Front and back

Reducing the roll gap increases the roll pressure to p3. Gage control in multiple rolling mills is achieved through measurement of strip thickness using x-ray gage and adjusting the strip tension using feedback control system. 1.8 Rolling defects: Mill spring is a defect in which the rolled sheet is thicker than the required thickness because,

New Rolling Method R f Reversing Cold Rolling Mill

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).

THE MECHANICS OF TENSION CONTROL

methods for doing this. • If you already have a load cell tension control, it normally has the ability to display actual tension in total pounds across the web. You can also purchase load cells with only a display (no control) if you would like to measure tension within any zone in your machine.

Basics of Web Tension Control Summary

different methods of control be it either speed or torque. Lastly we will explore the different types of tension systems including: manual, open loop and closed loop. We will discuss different components and methods used in each, as well as the advantages and disadvantages. This section is intended to help the audience best select the system best

Control of Strip Tension in a Rolling Mill Based on

Jan 01, 2014 Proceedings of the 19th World Congress The International Federation of Automatic Control Cape Town, South Africa. August 24-29, 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 27-29, 1040 Vienna, Austria (e-mail: [email

Control of Strip Tension in a Rolling Mill Based on

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.

Fuzzy looperless tension control for hot strip rolling

Feb 16, 2009 Currently, human operators are still employed in many rolling mills to manually suppress looperless interstand tensions. Having recognized the complexity of the process and the effectiveness of human-based control, a fuzzy control method is proposed for regulating looperless interstand tension.

FUZZY TENSION CONTROL OF THE WIRE ROD ROUGHING

tension. In general, rolling with low tension in roughing mill is a fundamental condition to ensure the stable rolling quality [2], [3]. This paper proposes the fuzzy control structure for the roughing mill in Slovakia Steel Mills, a.s. Strážske. The given roughing mill consists of six rolling stands (STD), individually driven by motors

Tension and Thickness Control Strategy Analysis of Two

Oct 01, 2012 Cold Rolling Plant, Jinan Iron and Steel Group Co Ltd. j inan 250101, Shandong,China) Abstract: In order to lucubrate the rolling characteristic of the two stands reversible cold rolling mill and establish the tension and thickness control strategy, the steady-state characteristic simulating program was established using the steady-state

Robust Tension Control of Strip for 5-Stand Tandem Cold Mills

Tandem cold rolling process is a nonlinear complex system with external and internal uncertainties and significant disturbances. The improvement in the quality of the final output depends on the control strategy of centerline thickness and interstand tension. This paper focuses on interstand tension control problem in 5-stand tandem cold rolling mills.

Shape and Gauge Control of Strip in a Cold Rolling Mill

Oct 06, 2020 Fig 1 Thickness control in a single stand cold reversing mill. For the single stand cold reversing mill, the external controllers are (i) the tension control by torque (TCT) in which the entry / exit tensions are kept constant through the torque regulated by the TC that, in turn, exploits the motors applied to the coiler / uncoiler reels, (ii) the gauge control, feed-back via gap (GBG) in

Technological control for cold rolling processes

AGC for foil mills Speed-tension optimization is used in foil mill appli-cations, since the strip thickness depends very closely on tension and rolling speed. In order to achieve maximized material throughput, the speed of the stand is increased until the strip tension has reached its control

New Rolling Method R f Reversing Cold Rolling Mill

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).

Rolling Mill an overview ScienceDirect Topics

P. Montmitonnet, in Encyclopedia of Materials: Science and Technology, 2001 2.4 Automatic Control and Modeling. Modern rolling mills, and specially cold tandem mills with high productivity, are equipped with a number of transducers participating in automatic control systems: rolling force (on exception rolling torques), strip tensions between stands, average gauge and thickness profile at exit

Minimum Tension in a Merchant Bar Rolling Mill using

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

Synthesis of Tension Control Systems for Winders of Cold

Oct 02, 2020 In tension control systems, the node for dynamic compensation of disturbance caused by a change in the speed of the rolling stand of cold-rolled sheet mills can contain only one channel that compensates only for the dynamic component. The limitation of the disturbance component due to the inaccuracy in the operation of the indirect torque

How to use automation to improve productivity and quality

Jan 01, 2013 The most frequent causes of dimensional defects are due to poor adjustments to the mill control and tension while rolling. To reduce the material tension along the mill two types of control are applied: minimum tension control and loop control. Each is applied in different parts of the mill.

A Flatness Based Approach for the Thickness Control in

Keywords: rolling mill, multi-stand mill, thickness con-trol, tension control, flying gauge change, non-linear control, flatness based control. Abstract A multi-stand rolling mill is a highly complex coupled non-linear system. If the operating point is changing in a wider range the non-linearities can no longer be neglected in the controller

Control of Strip Tension in a Rolling Mill Based on

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.

Synthesis of Tension Control Systems for Winders of Cold

Oct 02, 2020 In tension control systems, the node for dynamic compensation of disturbance caused by a change in the speed of the rolling stand of cold-rolled sheet mills can contain only one channel that compensates only for the dynamic component. The limitation of the disturbance component due to the inaccuracy in the operation of the indirect torque

MILL CONTROL SYSTEM AND METHOD FOR CONTROL OF

Mill control system and method for metal strip rolling con­ I.S. Choi, J.A. Rossiter, andPJ Fleming, "Looper and tension control in hot rolling mills: A survey", Journal of Process Control 17 (2007), 509-521. Gerald Hearns Michael J. Grimble, "Robust Multivariable Control

Tension and Thickness Control Strategy Analysis of Two

Oct 01, 2012 In order to lucubrate the rolling characteristic of the two stands reversible cold rolling mill and establish the tension and thickness control strategy, the steady-state characteristic simulating program was established using the steady-state continuous rolling theory. The influences of each factor on exit thickness under different tension control methods were analyzed.

Tandem rolling mill tension control with speed ratio error

Rolling mill control for tandem rolling: 1987-09-08: Clegg: 72/17: 4460852: Method of controlling mill motors speeds in a cold tandem mill: 1984-07-17: Kondo et al. 72/8: 4292825: Gauge and tension control system for tandem rolling mill: 1981-10-06: Morooka et al. 72/19: 4240147: Gauge control method and system for rolling mill: 1980-12-16

A Flatness Based Approach for the Thickness Control in

Keywords: rolling mill, multi-stand mill, thickness con-trol, tension control, flying gauge change, non-linear control, flatness based control. Abstract A multi-stand rolling mill is a highly complex coupled non-linear system. If the operating point is changing in a wider range the non-linearities can no longer be neglected in the controller

Technological control for cold rolling processes

AGC for foil mills Speed-tension optimization is used in foil mill appli-cations, since the strip thickness depends very closely on tension and rolling speed. In order to achieve maximized material throughput, the speed of the stand is increased until the strip tension has reached its control

ROLLING Primetals Technologies

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 the roughing mill. The width deviation after the finishing mill arises from the width deviation in front of the finishing mill

60 YEARS OF ROLLING MILL TECHNOLOGY By Ford B. Cauffiel

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

Thickness control method and system for a single-stand

Kabushiki Kaisha Toshiba (Kawasaki, JP) Nippon Steel Corporation (Tokyo, JP) Ishikawajima-Harima Jukogyo Kabushiki Kaisha (Tokyo, JP)

GAGE CONTROL METHOD AND SYSTEM FOR TANDEM ROLLING MILLS

In accordance with the present invention, a final gage control system and method for a tandem rolling mill are provided wherein final gage is varied by varying tension in the strip material being rolled between the last two stands while the roll force exerted on the strip by the last stand is maintained constant for all variations in last stand

Tension Control (e.g., Interstrand) Patents and Patent

Abstract: This disclosure provides adaptive control techniques for pH control or control of other industrial processes. For example, in one method, a robust stability condition (RSC) value is determined during operation of a process controller, and a characteristic of the process controller is adaptively modified based on the RSC value.

Analysis of Startup Process and Its Optimization for a Two

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

Taper Tension for Rewind Control: Definitions & Processes

Mar 17, 2015 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