looper and tension control in hot rolling mills a

Looper and tension control in hot rolling mills: A survey

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.

Looper and tension control in hot rolling mills: A survey

Jul 01, 2007· 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.

A SURVEY OF THE LOOPER-TENSION CONTROL

and mass ﬂow in hot rolling mills can be satisﬁed by proper control of the strip tension and looper angle. Figure 1 shows the tension and looper control in a typical ﬁnishing mill. Traditionally, looper angle control has been per-formed by changing the rotating speed of a main motor but there has been no tension feedback

Control of Strip Tension in a Rolling Mill Based on

principle, Steel industry, Tandem rolling mill, Looper control, Strip te nsion control. 1. INTRODUCTION In the metals industry, tandem hot strip rolling mills are used for rolling out thick semi- nished products, e.g., slabs, to thinner at products. The product, which is often referred to as strip, is clamped in each mill stand of

A SURVEY OF THE LOOPER-TENSION CONTROL TECHNOLOGY IN

Jan 01, 2005· Adaptive and robust control method with estimation of rolling characteristics for looper angle control at hot strip mill. ISIJ International, 43(3):358365, 2003. K. Asano, K. Yamamoto, T. Kawase, and N. Nomura. Hot strip mill tensionlooper control based on decentralization and coordination. Control Engineering Practice, 8:337344, 2000. I.

A SURVEY OF THE LOOPER-TENSION CONTROL TECHNOLOGY IN

CiteSeerX Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): Abstract: Looper and tension control is important in hot strip mills because it affects the strip quality as well as strip threading. Moreover, the most difficult challange in the controller design and control performance comes from the interaction between looper angle and strip tension.

A MPC DESIGN FOR THE LOOPER AND TENSION CONTROL IN

Keywords: model predictive control, LQMPC, hot rolling mill, dynamic rolling simulator, looper height control, looper and tension control. Abstract The looper and tension control is important in a hot strip mill because it affects the strip quality as well as strip threading. There are tension disturbances, which might cause constraint

Rolling Mill Loopers EKR

For optimized rolling between stands, loopers maintain a loop to ensure that there is no tension in the rolled material. We maufacture side loopers. Looper and tension control is important in hot strip mills because they affect the strip quality as well as strip threading. Loopers are arranged in the finishing mill area for tension-free rolling.

Distributed Dual-rate Consensus Predictive Control of

This paper considers a dual-rate distributed predictive control strategy for the looper tension system in hot rolling mills, which is a typical multi-agent system with directed communication topology. First, we establish an interconnected model for looper tension control system and the disturbances from the neighbors are considered effectively. Second, the consensus control protocol is

A neuro-fuzzy system for looper tension control in rolling

Jan 01, 2005· The plant model is a rolling mill that uses a looper for tension control . Tension is caused by the difference between the exit speed v 1 in stand one and the entry speed v 2 in stand two. Looper height is related to looper storage length by the mass conservation principle and can be empirically approximated by (1) H(t)= 1 α+β L(t).

Looper-Tension Sliding Mode Control for Hot Strip

Jan 01, 2012· Issue 1 Looper-Tension Sliding Mode Control for Hot Strip Finishing Mills 27 (26) (25) (27) s y=satCI,) 2. 3 Application of SMC to looper-tension control To apply the SMC methodology, the looperâ€º tension dynamics Eqn. (20) and Eqn. (21) need

A SURVEY OF THE LOOPER-TENSION CONTROL TECHNOLOGY

CiteSeerX Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): Abstract: Looper and tension control is important in hot strip mills because it affects the strip quality as well as strip threading. Moreover, the most difficult challange in the controller design and control performance comes from the interaction between looper angle and strip tension.

Looper and Tension Control in the Hot Strip Finishing Mill

This paper presents a new control method for interstand tension and looper height in the hot strip finishing mill. In the finishing mill, several passes of rolling are executed by tandem rolling in the presense of interstand tension. Tension can be adjusted either by manipulating roll speed or by using the looper, which is implemented between

New tension control at the head of strip in hot strip

Sep 12, 2008· One of the major causes for the width shrinkage is an over-tension by the mass flow unbalance (Bass and Hartmann, 1987).In the hot strip mill, the width prediction model between neighboring stands is represented by using the creep strain by the tension as follows Ishii, 1996, Won, 2002: (1) Δ W = W ⋅ exp ⁡ − ɛ s 2 − 1, (2) ɛ s = α ⋅ (σ / 9.8) β + γ ⋅ (σ / 9.8) m ⋅ t n

Simulating a Multi-Stage Rolling Mill Process, Part 2

Dec 17, 2009· This is the second webinar of a three-part webinar series that will highlight the use of MathWorks products for modeling and control of a multi-stage rolling mill process. In this particular webinar you will learn how to use MathWorks products to model the looper-strip interaction for tension control.

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.

Fuzzy Multiple Stand Tension Control of a Roughing Rolling

In steel rolling industry, control of hot metal rolling process plays an important role in assuring high product quality and safe process operation. Although many advanced looper control technologies for finishing rolling process have emerged, looperless interstand tension control of roughing rolling mills remains a challenging problem.

Modeling and Control of Multi Stage Rolling Mill Process

Sep 01, 2016· 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.

Rolling of Steel in a Modern Long Product Rolling Mill

Jun 19, 2017· 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 bar proceeds through the mill. A looper table can be used to aid in keeping the bar tension free between stands.

Looper H-infinity control for hot-strip mills IEEE

H-infinity (H/sub /spl infin//) control theory has been applied to some engineering fields including the steel making process. The H/sub /spl infin// contr Looper H-infinity control for hot-strip mills IEEE Journals & Magazine

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.

Fuzzy looperless tension control for hot strip rolling

Metal rolling is a large-scale complex manufacturing process. Tension control in such a process plays an important role for assuring both high product quality and safe process operation. Although there have been many looper control technologies developed for finishing rolling processes, looperless interstand tension control of roughing and intermediate rolling mills has had much less progress

Distributed Dual-rate Consensus Predictive Control of

This paper considers a dual-rate distributed predictive control strategy for the looper tension system in hot rolling mills, which is a typical multi-agent system with directed communication topology. First, we establish an interconnected model for looper tension control system and the disturbances from the neighbors are considered effectively. Second, the consensus control protocol is

Tension Modeling and Looper-Tension ILQ Servo Control of

Looper control is one of the most important control items in hot-strip mills. A looper is placed between rolling stands and is used for controlling the interstand strip tension.

Modeling and Control of Multi Stage Rolling Mill Process

Sep 01, 2016· 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.

Fuzzy looperless tension control for hot strip rolling

Metal rolling is a large-scale complex manufacturing process. Tension control in such a process plays an important role for assuring both high product quality and safe process operation. Although there have been many looper control technologies developed for finishing rolling processes, looperless interstand tension control of roughing and intermediate rolling mills has had much less progress

Looper H-infinity control for hot-strip mills IEEE

H-infinity (H/sub /spl infin//) control theory has been applied to some engineering fields including the steel making process. The H/sub /spl infin// contr Looper H-infinity control for hot-strip mills IEEE Journals & Magazine

Non-linear optimal control for the hot-steel rolling mill

Control of hot-steel rolling mills aims at raising the levels of quality of the related industrial production and at minimising the cost of the electric energy consumed by such industrial units. This paper proposes a non-linear optimal control approach for the hot-steel rolling mill system. The non-linear dynamic model of the hot-steel rolling mill undergoes approximate linearisation around a

(PDF) MODELLING AND CONTROL OF A HOT ROLLING MILL

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Takatsugu Ueyama's research works

However, looper scheme cannot be employed in roughing and intermediate rolling mills. Looperless interstand tension control remains a challenging problem [2]. The top two obstacles are the

Looper-Tension H ∞ Control for Hot Strip Finishing Mills

looper and tension control in hot strip finishing mills is traced based on approximately linearized model. This solution has been considered thanks to its well-known robustness and simplicity characteristics concerning disturbances' attenuation. The controller is designed based on an

Rolling of Steel in a Modern Long Product Rolling Mill

Jun 19, 2017· 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 bar proceeds through the mill. A looper table can be used to aid in keeping the bar tension free between stands.

Fuzzy multiple stand tension control of a roughing rolling

Although many advanced looper control technologies for finishing rolling process have emerged, looperless interstand tension control of roughing rolling mills remains a challenging problem.

Discrete-time fuzzy state feedback control for looper and

Abstract: This paper investigates the problem of fuzzy state feedback control for looper and tension control systems in hot rolling mills via a linear matrix inequality (LMI) approach. The considered system is approximated by a discrete-time looper and tension control system model. Based on a spectral norm approach, we design a fuzzy state feedback controller which makes the closed-loop

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

1.7 Rolling mill control: Production of continuous sheets and strips is one of the attractive features of modern rolling mills. However, control of sheet thickness and cross-section is a real challenge. In order to continuously monitor the thickness of sheets rolled, x-ray or gamma ray sensors are used.

Guaranteed cost sliding mode control for looper–tension

Dec 20, 2014· In order to further improve the control accuracy of looper–tension uncertain systems in hot strip finishing mills, an innovation-guaranteed cost sliding mode control method is researched. First, a sliding mode surface function is obtained by linear matrix inequalities and guaranteed cost technique.

looper and tension control in hot rolling mills a