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Dynamics and Variance Control of Hot Mill Loopers

Key words Loopers Covariance control Variance control Hot strip mill Hot rolling 1 Introduction A flnishing mill produces thin sheet from hot steel bars by successively reduc-ing the gauge using 5 to 7 sets of rolls each called a mill stand The flnishing mill is part of a hot strip mill of which a typical layout is given in Figure 1 Get price



by combining mechanical control system electric control system and hydraulic control system with the rolling mill Many stand tandem mill has turned to be a complex system with the strip steel which perform a function of transmitting the thickness convexity temperature and tension between stands Get price


NDC Technologies

NDC's new LaserSpeed Pro M Series gauge is the industry's only solution for hard-to-measure small bouncing and unguided cylindrical products Measure long extruded products such as metal pipe tube rods wire bars cordand other products with the highest repeatable accuracy Get price



Rolling Process SULB's rolling mill operations use modern cutting edge technology with fully automated processes that have Customer Quality designed into its equipment and standards Control and precision of mill equipment allows the most stringent customer requirements to be delivered Get price



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 faciliGet price


Tandem Cold Mill

Abstract Automatic Tension Control (ATC) system is important for the cold tandem mill rolling of steel Controller parameters must be adjusted continually according changing plant parameters to obtain better control performance So it is very difficult to maintain strip tension within a Get price


Advanced Reversing Cold Mills by Primetals Technologies

A two-stand reversing cold mill can deliver capacities between 300 000 t/a of thin-gauge products or 1 000 000 t/a and more of thicker-gauge products Main benefits of Primetals Technologies' reversing cold mills High production capacity and yield Flexible low-cost rolling of a wide range of products especially for small order lotsGet price


Flatness Control System of Cold Rolling Process with

shape control that has a closed loop of a shape roll and a rolling mill as shown in Fig 9 This has enabled high-speed and stable rolling without relying on operator skills 3 1 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 toGet price



We developed multivariable control systems of Rod Bar Rolling and Cold Strip Rolling In these systems we used the multivariable control theory and intelligent control method that is fuzzy method to adjust the multi-dimensional size such as the section shape in bar rolling shape (strip flatness) and edge drop (strip edge thickness Get price


Designing of Hot Strip Rolling Mill Control System

Due to its system to choose reasonable core equipment combining with advanced control algorithm efficient and stable data network is good to achieve the constant coiling tension control in the process of rolling In practice it achieved good economic benefits Cite this paper Yajun Wu (2016) Designing of Hot Strip Rolling Mill Control System Get price


Modeling simulation and identification for control of

12-8-2011Modeling simulation and identification for control of tandem cold metal rolling such as mill thickness input strip input tension on stand 1 and strip output tension on stand 5 c) Tandem Cold Metal Rolling Mill Control - Using Practical Advanced Methods Get price


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 Get price


Assessment of gauge deviation due to speed and tension

2-12-2013AbstractIt is known that speed and current or tension variations have an effect on output gauge At present the relationship is not clearly defined and it is difficult for practising engineers to estimate the effect of speed and current or tension variations on gauge accuracy and to specify control accuracy requirements In this Get price


New tension control at the head of strip in hot strip

New tension control at the head of strip in hot strip finishing mill New tension control at the head of strip in hot strip finishing mill Park Cheol Jae Hwang I Cheol 2008-09-12 00 00 00 In this paper a new tension control scheme is proposed to diminish the width shrinkage at the head of the strip in the hot strip finishing mill Get price


The Complete Technology Book on Hot Rolling of Steel

rolling mill thus helps in reducing the size of a metal thereby molding it into the desired form and shape gauge control sensors and actuators automatic gauge control systems strip tension control system in cold mills flat rolling practice cold rolling pack rolling The Complete Technology Book on Hot Rolling Get price


Hot strip mill tension–looper control based

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 Get price


Rolling Process

Four-high mill Small-diameter rolls (less strength rigidity) are supported by larger-diameter backup rolls Cluster mill or Sendzimir mill Each of the work rolls is supported by two backing rolls 7 •Use a series of rolling mill and each set is called a stand •The strip will be moving at different velocities at each stage in the mill Get price


Hot Cold Working and the Rolling Process

Hot Cold Working and the Rolling Process back-up rolls are often used to counter this phenomenon Another method to reduce or eliminate elastic roll deflection is to use materials of high elastic modulus both ends run out to the coiler without any tension between the coiler and finishing mill Get price


Advanced Control for Hot Rolling Mills

Advanced Control for Hot Rolling Mills Authors Authors and affiliations M J K Sekiguchi and H Imanari "Tension Control of a Hot Strip Mill Finisher" IFAC 13th Triennial World Congress M Saito T Kataoka H Sasao and K Yabuuchi "A New Tension Control Method for Hot Strip Finishing Mill" IFAC 10th Triennial World Get price


11 Advanced Process Control Technology for Thin Strip

Advanced Process Control Technology for Thin Strip Rolling Kazuhiro Ohara Masaki Nakaema Siau Kah Choon1 Zhou Ming Wei Yang Hui2 1 INTRODUCTION Hunan Valin Liangang Steel Sheet Co Ltd commissioned a new hot strip mill with an annual production of 2 4 million tons/year located in Hunan province China in December 2003 Get price


Optimization of cold rolling mill process to improve

rolling mill process in order to maximize throughput and minimize cost and crop losses He applied computational Intelligence based optimization for the first time to the rolling schedule of tandem cold rolling mill Rolling schedule is a set of multiple rolling parameters such as reduction roll force torque rolling speed and tension Get price


Tension Control of a Hot Strip Mill Finisher

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 Get price


Cold Mill Tension Reel

20-12-2011Cold Mill Tension Reel Pete K Loading Unsubscribe from Pete K? Cancel Unsubscribe Working Rebuilding older machines using the hand scraping method - Duration 26 09 SuburbanTool Inc 685 334 views 6 HI Cold Rolling Mill 1250 mm 1200 mpm - 0 128 mm Gauge Rolling - Duration 6 40 YOGIJI DIGI 22 866 views Get price


US Patent # 5 809 817 Optimum strip tension control

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

Analysis of Small Spalling Mechanism on Hot Rolling Mill

Analysis of Small Spalling Mechanism on Hot Rolling Roll Surface 3 2 2 Discussion of the small spalling 2 2 1 Cracks perpendicular to the roll surface During rough rolling and finish front rolling when the roll surface is rapidly cooled during rolling cracks are initiated by Get price


Development of Strip Shape Meter with High Accuracy Under

tension in the rolling direction As a result the device can measure the shape of the strip being rolled In addition the looper roll between the rolling stands can easily be replaced with the device and LSM has almost the same tension control performance primarily demanded on the inter-stand looper system Get price


Design of a robust thickness controller for a single

Abstract We derive a mathematical model of a single-stand cold rolling mill and design control systems to improve the thickness precision while maintaining prescribed tension for the strip On the basis of a linearized model of the rolling mill system we propose a thickness controller using an internal model control (IMC) structure which effectively rejects periodic disturbances Get price


Figure 3 from Tension control of a two

2-10-2019(f) Front-drum armature current - Tension control of a two-drum winder using paper tension estimation Fig 3 Hamilton‐based adaptive robust control for the speed and tension system of reversible cold strip rolling mill Le Liu Nuan Shao No-Tension Sensor Closed-Loop Control Method with Adaptive PI Parameters Get price


Hot Rolling Mill Hydraulic Gap Control (HGC) thickness

accuracy in thickness control in metal rolling area If the required accuracy of hot rolling mills can be achieved then in some cases cold rolling is not even required which can result in a radical decrease of production costs The schematic structure of a typical aluminum hot reversing rolling mill can be seen in Get price


Rolling mill speed calculation formula pdf

of the former method the 3 roll mill whose spread by rolling un- der light Torque speed calculation for ball mill designing calculation of critical speed of ball Which calculations similar to those used in calculating change gear ratio for rolling mill speed calculation formula pdfGet price


Title The Robust Control Strategy Of Strip Tension For

The Robust Control Strategy Of Strip Tension For Cold Rolling Abstract This thesis addresses the control problem of tension in cold rolling mill It is very important to control the tension to achieve stable rolling and ensure strip quality Firstly the model of the plant is Get price


Flatness adaptive control of a hot strip in finishing mills

Flatness adaptive control of a hot strip in nishing mills (PI) control method The FlatSIL system measures the tension and estimates the tension pro le in the lateral direction and the control system was applied to a hot rolling mill at POSCO Kwangang in South Korea Get price


1301 The Rolling of Aluminium the Process and the Product

the hot rolling mill is coiled for transport to the cold mill which might be on the same site or elsewhere Cold mills in a wide range of types and sizes are available some are single stand others 3 stand and some 5 stand (Figures 1301 02 03 and 1301 02 04) Cold rolling speeds vary but modern mills operate at exit speeds as high as 3000 m perGet price


Rev1 Recent Development of Skinpass Mill and Tension Leve

equipped with a bender and a tension reel however a hi-tension 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 high-tensile strength steel plate under high tension have become possible and a flatness comparable to a coldGet price

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