Design tension levelling lines and ... FAGOR offers a full assistance and training service during the setup and startup of the lines and rolling mills. The process control and modelling systems are also integrated, with a team specialising in processing lines and rolling mills. FAGOR's six plants also enable us to optimise the manufacture ...
1 HOT ROLLING PRACTICE – An Attempted Recollection Saral Dutta. B. Tech. (Hons.), Executive Director, ISP RMD, SAIL (Retired) Rolling is a metal forming process in which metal stock is passed through a pair of rolls.
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
The construction of the minimum tension control system for the bar rolling mill of Fushun Iron Steel Company is presented, and the control process, speed cascade and R factor control .
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
Abstract—The role of a hot rolling mill process is to produce strips of thickness about ∼ 20 mm from heated slabs. One of the major control problems in hot rolling mills are the looper and tension control loops because these have a significant impact on the dimensional quality of a strip and process stability.
used to control the mass flow passing the rolling mills. A single stand in tandem rolling mills with dimension and yield regulation systems isschematically illustrated in Figure Single stand in tandem rolling mill According to the rolling processes of a work piece, the operation modes of .
equipped with a bender, and a tension reel; however, a hitension hot mill line having a bridle roll and a tension leveler added to that also exists. The arrangement is shown in Fig. 4. Stable extension rate control and rolling of a thin hightensile strength steel plate under high tension have become possible, and a flatness comparable to a cold
An optimal multivariable looper control system based on new decoupling strategy has been developed for hot strip finishing mills. The variables coupling degree is determined by the diagonal dominance degree of inverse Nyquist curve. Through pseudodiagonalisation compensating the loopers′ height and tension control system has the diagonal dominance characters.
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, Strážske. The given roughing mill consists of six rolling stands (STD), individually driven by motors ...
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 (eds) Advances in Control. Springer, London ...
In the rolling process, the upper and lower working rolls of the mill usually under different load. In order to keep good product quality, load balance control is necessary. This paper proposes a control method which uses the torque difference between upper and lower roll to compensate the given current of the upper roll motor. Simulation results show that the proposed control method can give ...
shape control that has a closed loop of a shape roll and a rolling mill as shown in Fig. 9. This has enabled highspeed and stable rolling without relying on operator skills. Shape analysis Figure 10 shows the concept of shape analysis. The average rolling tension and the tension deviation for each rotor are determined from the load applied to
Apr 14, 1992· I claim: 1. A method for controlling interstand strip tension in a metal cold rolling mill having at least two rolling stands, each with at least one pair of opposed workrolls for reducing the thickness of a metal workpiece passed therebetween, tension sensing means for sensing strip tension between adjacent stands, means for sensing the rolling speed of each stand, and tension control .
The Complete Technology Book on Hot Rolling of Steel Author: NIIR Board of Consultants Engineers Format: Paperback ... automatic gauge control systems, strip tension control system in cold mills, flat rolling practice cold rolling, pack rolling, steelmaking refractories, refining of ... Passive roll eccentricity control methods
Aimed at the complex demand of hot strip rolling mill in practicing, the configuration of the coiler and the technological process is analyzed. The arithmetic of coiling tension and the control process is introduced. The frame of the tension adjusting system is given. The coiler control system hardware is designed. The system is designed scientifically with steady control and meets demand of ...
Jan 14, 2017· Gauge control in hot strip rolling mills is achieved through measurement of strip thickness using xray gauge and adjusting the strip tension using feedback control system. During the rolling of hot strips, the hot strip is coiled to handle its increasing length due to a reduction of thickness.
PLATE THICKNESS CONTROL METHOD BY CONTINUOUS ROLLING MILL ... METHOD FOR TENSION CONTROL The invention relates to a method for tension control in a bandshaped material between two tension points, in particular between two adjacent roll stands, wherein at least one of the tension points has a rotary drive as an actuator. ...
Some of the earliest literature on rolling mills can be traced back to Christopher Polhem in 1761 in Patista Testamente, where he mentions rolling mills for both plate and bar iron. He also explains how rolling mills can save on time and labor because a rolling mill .
This slight tension control is called the "Tension Free Control". The main technical problem of such control is to detect the interstand tension without touching the strip. The tension measurement method shown in this paper is a method which, uses the motor torque and the rolling force of each stand.
the speed of the drive mill motor. Of the control systems that can directly or indirectly influence the specifications of the HSMP, the looper control system, whose controlled outputs are the strip tension and looper angle, is a key subsystem for the safe rolling process and stable strip quality. Strip tension control is
The longitudinal tension in the strip is another important process variable to be controlled. For this purpose, a MIMO mass flow control strategy defines the rolling velocities at the individual mill stands and uses looper rolls to ensure a predefined strip tension between the mill stands.
It is confirmed that the suggested control strategy needs less control efforts and shows better performance than those of the existing control method in a rolling process. Key Words Rolling System Tension Control Tension Transfer RealTime System Mathematical Model Automatic Gauge Control
POINTWISE LINEAR QUADRATIC OPTIMAL CONTROL OF A TANDEM COLD ROLLING MILL John R. Pittner, PhD University of Pittsburgh, 2006 The tandem cold rolling of metal strip is a complex multivariable process whose control presents a significant engineering challenge. The present technology generally relies on a control
Nov 09, 2000· Abstract: There is disclosed a looper control system for a continuous rolling mill comprising: a section for performing the integral operation of respective deviations between measured values and target values with respect to the tension and the looper angle, and the proportional operation of respective deviations between the tension, the looper operation angle, and the rotational speed of .
ABB drives in metals ABB ACS 6000 rolling mill drive ABB's ACS 6000 is a modular drive designed for the most demanding singlemotor and multimotor applications in the metals industry. It is available with four sizes of inverter modules (3, 5, 7 and 9 MVA). The optimum configuration for specific applications can be reached by
Speed cascade control system for bar and wire rod mills Value Paper Authors: SUN Xin, SUN Hanfeng ... the minimum tension control and loop control are the necessary methods for achieving these. The actual values ... is the output torque of motor in tensionfree rolling; T m
Improvement of Electric and Mechanical System for Automated Strip Tension Control at Continuous WideStrip HotRolling Mill . HOME ; Improvement of Electric and Mechanical System for Automated Strip Tension Control at Continuous WideStrip HotRolling Mill
Download Citation on ResearchGate | Robust control of strip tension for tandem cold rolling mill | It is very important to control the tension of the cold rolling mill. To achieve stable rolling ...
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 ...