tension control method for a rolling mill

USA Tension control method for a rolling mill

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 tailout stage, and it is controlled by a tension control method employing a looper during the steady rolling

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Tension control method for a rolling mill Hitachi, Ltd

A tension control method for a rolling mill according to claim 1, characterized in that when the looperless tension control method is to be changedover to the tension control method with the looper, the former is changedover to the latter via a region in which both said control methods are simultaneously executed

Looper and tension control in hot rolling mills: A survey

A survey of tension control methods for rolling mills can be found in [5] However, tension control in rolling mills is not directly comparable to tension control in slitting lines, since rolling

Looper and tension control in hot rolling mills: A survey

· An observerbased 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 is different from the conventional control

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CONTROL METHOD OF TENSION IN ROLLING MILLS (2)

In the cold rolling of metal strips in a multistand rolling mill, a method of tension control during a size alteration of the strip comprising the steps of: 2 The method of claim 1 wherein the step of dividing the detected plate thickness variation by the strip thickness prior to said size alteration includes measuring the roll down position of the roll at a given stand; measuring the

The Study of Continuous Rolling Mill Interstand Tension

It analyses the operation of the rolling mill using different system for tension inferential control The finished studies prove that size alignment is provided with the tension control system

JPSA Controlling method for interstand tension

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

CONTROL METHOD OF TENSION IN ROLLING MILLS (2)

In the cold rolling of metal strips in a multistand rolling mill, a method of tension control during a size alteration of the strip comprising the steps of: 2 The method of claim 1 wherein the step of dividing the detected plate thickness variation by the strip thickness prior to said size alteration includes measuring the roll down position of the roll at a given stand; measuring the

Automatic Tension Control in the Continuous Roughing

· It involves combining speeddifference tension control during free rolling and staticcurrent tension control during multistand rolling on three stands A functional block diagram of the system implementing the method is considered Experimental data obtained on the 2000 mill are presented The basic advantages of the system that demonstrate its efficiency are indicated

Robust Tension Control of Strip for 5Stand Tandem Cold

To promote tension control of cold rolling mills, two advanced robust control systems are proposed First, a statespace description of full stands with parametric uncertainty is derived for tension system with 5stand tandem mills Taking into account the variation of strip thickness, Young’s modulus, forward slip, and speed actuator time constant, the model of structured uncertainties is

Minimum Tension in a Merchant Bar Rolling Mill using

· The problem of achieving minimum bar tension in a merchant bar rolling mill without direct tension measurement is considered A nonlinear statespace 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

USA Interstand tension control method and

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

1 Hot rolling and rolling defects: 11 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 xray gage and adjusting the strip tension using feedback control system 18 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 (payoff ree l), an entry winding machine (tension reel) and a deliverywinding machine (tension reel) There are many cases in which a shearing machine for dividing a strip is installed on the delivery side of the mill

Understanding Rolling Process in Long Product Rolling

· cobble, grooves, mill speed, motor, roll gap, rolling mill, rolls, tension control, yield, Understanding Rolling Process in Long Product Rolling Mill Steel rolling consists of passing the material, usually termed as rolling stock, between two rolls driven at the same peripheral speed in opposite directions (ie one clockwise and the second anticlockwise) and so spaced that the distance

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 suited to their individual applications The

Design and Analysis of a Novel Tension Control Method

· F JanabiSharifi A neurofuzzy system for looper tension control in rolling mills Control Engineering Practice, 2005, 13(1): 1–13 [14] F JanabiSharifi, J R Liu Design of a selfadaptive fuzzy tension controller for tandem rolling IEEE

MODELLING AND CONTROL OF A HOT ROLLING MILL

MODELLING AND CONTROL OF A HOT ROLLING MILL F Similar actions are taken for tension variations which depends on the amount of strip accumulated between the last two Stands F9 and F10 This tension is a function of the difference between the strip output and input speeds on the Stands F9 and F10 respectively In our case this tension is controlled by the rolls tip speed variation of the

Fuzzy multiple stand tension control of a roughing rolling

DOI: 101109/NAFIPS2002 Corpus ID: Fuzzy multiple stand tension control of a roughing rolling mill @article{JanabiSharifi2002FuzzyMS, title={Fuzzy multiple stand tension control of a roughing rolling mill}, author={F JanabiSharifi and G Li}, journal={2002 Annual Meeting of the North American Fuzzy Information Processing Society Proceedings

Tension and Thickness Control Strategy Analysis of Two

In order to lucubrate the rolling characteristic of the two stands reversible cold rolling mill and establish the tension and thickness control strategy, the steadystate characteristic simulating program was established using the steadystate continuous rolling theory The influences of each factor on exit thickness under different tension control methods were analyzed The results show that

Understanding Rolling Process in Long Product Rolling

· cobble, grooves, mill speed, motor, roll gap, rolling mill, rolls, tension control, yield, Understanding Rolling Process in Long Product Rolling Mill Steel rolling consists of passing the material, usually termed as rolling stock, between two rolls driven at the same peripheral speed in opposite directions (ie one clockwise and the second anticlockwise) and so spaced that the distance

Taper Tension for Rewind Control: Definitions &

How to Use Taper Tension for Rewind Control The best method of achieving taper tension is to measure the diameter of the roll, either using an ultrasonic sensor or two pulse tachometers (one on measuring revolutions of the rewind roll and one measuring revolutions of a drive roll) This measured diameter is then processed and is used to reduce the tension as the roll diameter increases Taper

ROLLING Primetals Technologies

widthdeviation compensation using tension control is limited to lowfrequency width deviations By default, the strip width in a hotstrip mill is determined 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 and from widthspread anomaly occurring inside the finishing mill The

PROCESS OF ROLLING MILLS

· A wire rod rolling mill, for example, gradually reduces the crosssectional area of a starting billet (eg, 150 mm square, 1012 meters long) down to a finished rod (as small as 50 mm in

A BASIC UNDERSTANDING OF THE MECHANICS OF ROLLING MILL ROLLS

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 body and necks have to be considered as normal parts of designed components under high load This means that necks should not experience

60 YEARS OF ROLLING MILL TECHNOLOGY By Ford B Cauffiel

impart a surface finish on one or both sides of the material, just to name the most common methods Rolling mills are not a standard machine tool, nor are they built for stock They are designed and built toorder to specifically accomplish an end product or process At one point during the industrial revolution in America, the United States led the world in hot and cold rolling, plate mills