Showing 01 - 12 of 139 Results
Tension Control Method For A Rolling Mill
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.
US4137742A Interstand tension control method and
The interstand tension is computed on the basis of the computed torque arms l 1,l 2,and detected rolling torques G 1,G 2 and rolling forces P 1,P 2,and the roll drive main motor is regulated to compensate the deviation of the computed interstand tension from the desired value to maintain the interstand tension constant throughout the
Tension control method for a rolling mill Hitachi, Ltd.
Jul 31, 1979· We claim: 1. In the control of a tension of a workpiece which is rolled by a tandem rolling mill, a tension control method for a rolling mill characterized in that a looperless tension control in which a tension is computed from a driving current for rolls and a rolling load and in which the tension is controlled in accordance with a deviation from a desired tension is executed during a
Looper and tension control in hot rolling mills: A survey
Looper and tension control is important in hot strip mills because they affect the strip quality as well as strip threading. Moreover, the most difficult challenge in controller design and control
Looper and tension control in hot rolling mills: A survey
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.
US3848443A Automatic control method and apparatus for a
A method and apparatus for adjusting the respective roll openings of the roll stands of a cold rolling mill during the workstrip threading operation so that the rolling mill can be accelerated and to maintain the workstrip on-gauge without undesired waste of material before acceleration. The interstand tensions are maintained at the desired value and tension disturbance is eliminated by
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.
MILL CONTROL SYSTEM AND METHOD FOR CONTROL OF
MILL CONTROL SYSTEM AND METHOD FOR CONTROL OF METAL STRIP ROLLING STATEMENT REGARDING FEDERALLY SPONSORED DEVELOPMENT 2 FIG. 6 is a block diagram representation of an example overall control system structure embodying aspects of the present invention. FIG. 7 is a block diagram representation intended to facili
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,
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
MILL CONTROL SYSTEM AND METHOD FOR CONTROL OF
MILL CONTROL SYSTEM AND METHOD FOR CONTROL OF METAL STRIP ROLLING STATEMENT REGARDING FEDERALLY SPONSORED DEVELOPMENT 2 FIG. 6 is a block diagram representation of an example overall control system structure embodying aspects of the present invention. FIG. 7 is a block diagram representation intended to facili
A New Tension Control Method for Hot Strip Finishing Mill
NKK has developed a new tension control method for the hot strip finishing mill, and applied it to Keihin Works. The behavior of the interstand tension by the looper control was evaluated by simulation and it was concluded that the mass moment of looper inertia should be reduced drastically.
Control of Strip Tension in a Rolling Mill Based on
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 protected]) Abstract: A mathematical model of a strip-looper system of a hot
Simulating a Multi-Stage Rolling Mill Process, Part 3
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
Understanding Rolling Process in Long Product Rolling Mill
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.
Modeling and Control of Multi Stage Rolling Mill Process
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.
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
On the Optimization Procedure of Rolling Mill Design An
On the Optimization Procedure of Rolling Mill Design can be applied for the real-time crown/shape control using the linear crown control matrix method. 17.25 ksi entry tension, 26.25 ksi
US5546779A Interstand strip gauge and profile conrol
Method and means for maintaining uniform thickness and profile of a metal strip during hot rolling in a multi-stand hot rolling mill, comprising a two-position looper located between adjacent mill stands and movable between a strip threading position above the rolling pass line of the mill and a rolling position substantially in the plane of the rolling pass line, and a thickness and profile
Tension Control of a Hot Strip Mill Finisher ScienceDirect
This paper describes interstand tension control by looper and looper less tension control of a hot strip mill finisher. The looper tension control methods are conventional, non-interactive, LQ (Linear Quadratic), H ∞, and ILQ(Inverse Linear Quadratic) control.
Hot strip mill tension–looper control based on
Since tension and looper control is the key to successful operations in the hot strip finishing mill, several multivariable controllers have been applied. However, this leads to complicated controllers, which are hard to tune on site. This paper presents a new control method based on decentralization and coordination.
JPH0515915A Method for controlling tension of tandem
Wherein detecting the upstream tension and downstream tension of the rolling stand, to perform the calculations of the forward slip on the basis of both of them, claim 1 tension control method of tandem rolling mill according.
Hot strip mill tension–looper control based on
Since tension and looper control is the key to successful operations in the hot strip finishing mill, several multivariable controllers have been applied. However, this leads to complicated controllers, which are hard to tune on site. This paper presents a new control method based on decentralization and coordination.
JPH0515915A Method for controlling tension of tandem
Wherein detecting the upstream tension and downstream tension of the rolling stand, to perform the calculations of the forward slip on the basis of both of them, claim 1 tension control method of tandem rolling mill according.
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
AUTOMATIC CONTROL METHOD AND APPARATUS FOR A ROLLING MILL
Nov 19, 1974· AUTOMATIC CONTROL METHOD AND APPARATUS FOR A ROLLING MILL automatic gauge control for a rolling mill often uses the tension condition existing between stands as an additional parameter for controlling the gauge. In the latter respect, it is known that the interstand tension is of greater importance in cold mill operation than in a hot mill
(PDF) Speed Control of Steel Rolling Mill using Neural Network
Speed Control of Steel Rolling Mill using Neural Network as a comparison with the conventional control method for a practical worksheet data. height formation in steel rolling mill, and
Fuzzy multiple stand tension control of a roughing rolling
Request PDF on ResearchGate Fuzzy multiple stand tension control of a roughing rolling mill In the steel rolling industry, control of the hot metal rolling process plays an important role in
Rolling mill looper control system Westinghouse Electric
Dec 29, 1981· The invention relates in general to interstand tension control apparatus for a rolling mill, and more particularly to looper control apparatus in a tandem or continuous hot strip rolling mill. The looper is a mechanism installed between any two stands, in a tandem mill installation.
Automatic Tension Control in the Continuous SpringerLink
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
Rolling Mill Control Russula
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.
New Rolling Method R f Reversing Cold Rolling Mill
OUTLINE OF 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
Rolling of Steel in a Modern Long Product Rolling Mill
Jun 19, 2017· As the bar progresses through a continuous mill where the bar is rolled in multiple stands simultaneously, the stand speed must be controlled to ensure tension free rolling. 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
Looperless Tension Control in Hot Rolling Process Using SVR
Constant tension control between stands in hot rolling process is essential to enhance the quality of steel. Sensorless tension control is under research by some advanced companies to replace the conventional tension control method because in continuous finishing mill process, it is impossible to install the looper used in conventional control
Tension control in a metal rolling mill General Electric
Oct 22, 1985· A metal rolling mill for reducing the thickness of a metal workpiece passed between a pair of opposed work rolls is controlled to maintain substantially constant tension in the workpiece on the entry side of the work rolls to thereby improve the uniformity of the workpiece gate at the mill output.
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.
Rolling of Steel in a Modern Long Product Rolling Mill
Jun 19, 2017· As the bar progresses through a continuous mill where the bar is rolled in multiple stands simultaneously, the stand speed must be controlled to ensure tension free rolling. 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
Looperless Tension Control in Hot Rolling Process Using SVR
Constant tension control between stands in hot rolling process is essential to enhance the quality of steel. Sensorless tension control is under research by some advanced companies to replace the conventional tension control method because in continuous finishing mill process, it is impossible to install the looper used in conventional control
Tension control in a metal rolling mill General Electric
Oct 22, 1985· A metal rolling mill for reducing the thickness of a metal workpiece passed between a pair of opposed work rolls is controlled to maintain substantially constant tension in the workpiece on the entry side of the work rolls to thereby improve the uniformity of the workpiece gate at the mill output.
Value Paper Authors: SUN Xin, SUN Han-feng Speed cascade
Speed cascade control system for bar and wire rod mills Value Paper Authors: SUN Xin, SUN Han-feng the minimum tension control and loop control are the necessary methods for achieving these. The actual values is the output torque of motor in tension-free rolling; T m
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.
Multivariable decoupling robust control for the thickness
In order to improve the thickness of the strip and tension control accuracy, control system of tandem cold rolling is equipped with the decoupling control of tension and gauge. Applying the method
Hot Rolling Mill Hydraulic Gap Control (HGC) thickness
Hot Rolling Mill Hydraulic Gap Control (HGC) thickness control improvement Peter Kucsera*, Zsolt Abstract: In this article the AGC (Automated Gauge Control) system, of a hot rolling mill is analyzed and different methods are described to improve its performance. The mill stretch P. Kucsera et al. Hot Rolling Mill HGC Thickness Control
GAGE CONTROL METHOD AND SYSTEM FOR TANDEM ROLLING MILLS
May 07, 1974· 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
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
Fuzzy multiple stand tension control of a roughing rolling
Fuzzy multiple stand tension control of a roughing rolling mill @article{JanabiSharifi2002FuzzyMS, title={Fuzzy multiple stand tension control of a roughing rolling mill}, author={Farrokh Janabi-Sharifi and Ge-qiang Li}, journal={2002 Annual Meeting of the North American Fuzzy Information Processing Society Proceedings.
Advanced Control for Hot Rolling Mills SpringerLink
Anbe Y., K. Sekiguchi and H. Imanari, “Tension Control of a Hot Strip Mill Finisher”, IFAC 13th M. Saito, T. Kataoka, H. Sasao and K. Yabuuchi, “A New Tension Control Method for Hot Strip Finishing Mill”, IFAC 10th Hearns G. (1999) Advanced Control for Hot Rolling Mills. In: Frank P.M. (eds) Advances in Control. Springer, London
Designing of Hot Strip Rolling Mill Control System
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
The Integrated Robust Control of Interstand Strip Tension
We describe an integrated tension controller design for a tandem cold rolling mill in steel plants. To achieve stable rolling and ensure strip quality, it is very important to control the tension of the cold rolling mill. Previous researches examined only the operation of a single stand. But it is not sufficient to examine the operation and effect of whole stands because the operation is
