## 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 driveControl of Strip Tension in a Rolling Mill Based on,Jan 01, 2014· Keywords: Nonlinear systems, Impedance control, Distributed parameter system, Hamilton's principle, Steel industry, Tandem rolling mill, Looper control, Strip tension control. 1. INTRODUCTION In the metals industry, tandem hot strip rolling mills are used for rolling out thick semi-finished products, e. g., slabs, to thinner flat products.

## US4137742A Interstand tension control method and

1. In a tandem rolling mill consisting of a plurality of rolling stands, an interstand tension control method including the step of computing the interstand tension on the basis of the detected rolling force and rolling torque, and the step of computing the deviation of said computed interstand tension from the desired value and applying an interstand tension control compensating signalDE102010013387B4 Control device and method for a rolling,The rolling mill control apparatus according to the present invention is a control apparatus for a rolling mill having tensioning rollers for feeding and winding up a rolling material at the entrance side and the exit side of the rolling mill. The control apparatus comprises a tension speed control means for carrying out the control such that the tension between the tensioning roller and the

## Looper and tension control in hot rolling mills: A survey

A survey of tension control methods for rolling mills can be found in. However, tension control in rolling mills is not directly comparable to tension control in slitting lines, since rolling mill.Looper and tension control in hot rolling mills: A survey,Jul 01, 2007· An observer-based multivariable tension control, was developed to improve tension control accuracy at strip threading time and applied to aluminium hot rolling mills.

## 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).Minimum Tension in a Merchant Bar Rolling Mill using,Aug 01, 1990· At the No. 2 Merchant Mill, the operators currently control tension in the intermediate stands in a manual fashion, adjusting the rollspeeds of each stand during threading according to the observed variations in roll drive motor currents.

## Understanding Rolling Process in Long Product Rolling Mill

Nov 27, 2015· 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. High tension can stretch reduce the cross section of the bar making shape control very difficult. At the extreme, tension can pull the bar apart, creating a cobble.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.

## 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.Control of strip tension in a rolling mill based on,The control target in the looper-tension control of HRM (hot rolling mills) is to maintain looper angle and strip tension simultaneously at their desired values.

## A Flatness Based Approach for the Thickness Control in

Keywords: rolling mill, multi-stand mill, thickness con-trol, tension control, ﬂying gauge change, non-linear control, ﬂatness based control. Abstract A multi-stand rolling mill is a highly complex coupled non-linear system. If the operating point is changing in a wider range the non-linearities can no longer be neglected in the controllerDIGITAL OPTIMAL CONTROL OF MULTI-STAND ROLLING ,In order to develop the optimal control algorithm for rolling mills, LQR method is first introduced for linear systems without delay. Then, incorporating the input and measurment delays into dynamical equations, the proposed controller is designed. 4.1. Classical LQR algorithm revisite Consider a linear system, described by x&=Ax+Bu (20)

## Advanced technologies for a new 20-roll mill stand

Technologies used for the rolling mill: Thickness control based on mass flow and speed/ tension feed forward control Direct tension control and coil eccentricity compensation Flatness control (crown adjustment, skewing, axial shifting, roll gap position) The individual control strategies include monitoring functions for safe operation.PROCESS OF ROLLING MILLS,Feb 25, 2016· A wire rod rolling mill, for example, gradually reduces the cross-sectional area of a starting billet (e.g., 150 mm square, 10-12 meters long) down to a finished rod (as small as 5.0 mm in

## A BASIC UNDERSTANDING OF THE MECHANICS OF

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 -Rolling of Metals,–Rolling at elevated temperatures to lower the strength of the material –Apply longitudinal tension to the strip during rolling –back tension on the pay-off reel or front tension on the take-up reel • Grind rolls with a camber to prevent crowning of the rolled strip • Radius of

## Edge-Drop Control Behavior for Silicon Strip Cold Rolling

Metals 2018, 8, 783 2 of 12 mill for the production of cold-rolled silicon strips. However, the edge-drop control for the silicon strips has always been a research hotspot of various mills [6–8].Taper Tension for Rewind Control: Definitions & Processes,Taper Tension for Rewind Control. Posted by Bryon Williams & filed under Article Library, Technical Papers.. Center winding film or other extensible material comes with inherent difficulties. If you maintain a constant tension on the web, as the diameter of the roll increases, the wraps become tighter.

## cold rolling mill with tension bridle

US6269668B1 Cold tandem rolling method and cold . The present invention is to provide a tandem cold rolling method conducted by a tandem cold rolling mill, the number of rolling stands of which is not less than,wherein a rolling tension, the intensity of which is not lower than,preferably not lower than of the deformation resistance of material to be rolled, is given at least by the finalControl 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.

## 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 steady-state characteristic simulating program was established using the steady-state continuous rolling theory. The influences of each factor on exit thickness under different tension control methods A Flatness Based Approach for the Thickness Control in,Keywords: rolling mill, multi-stand mill, thickness con-trol, tension control, ﬂying gauge change, non-linear control, ﬂatness based control. Abstract A multi-stand rolling mill is a

## Steel Rolling Technology Handbook (2nd Revised Edition)

Strip Tension Control System Three Stage AGE for Tandem Cold Mill Feed-forward AGC for Tandem Cold Mill Flow-Stress Feed-Forward AGC Width Change and Control in Rolling Mills Main Objectives and Methods of Width Change Width Reduction by Rolling Slab Sizing Mills Advanced technologies for a new 20-roll mill stand,Technologies used for the rolling mill: Thickness control based on mass flow and speed/ tension feed forward control Direct tension control and coil eccentricity compensation Flatness control (crown adjustment, skewing, axial shifting, roll gap position) The individual control

## DIGITAL OPTIMAL CONTROL OF MULTI-STAND ROLLING

In order to develop the optimal control algorithm for rolling mills, LQR method is first introduced for linear systems without delay. Then, incorporating the input and measurment delays into 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 (pay-off ree l), an entry winding machine (tension reel) and a delivery-winding machine (tension

## A BASIC UNDERSTANDING OF THE MECHANICS OF

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 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

## Edge-Drop Control Behavior for Silicon Strip Cold Rolling

Metals 2018, 8, 783 2 of 12 mill for the production of cold-rolled silicon strips. However, the edge-drop control for the silicon strips has always been a research hotspot of various mills [6–8].Dynamic Control of Flatness and Elongation of the Strip in,The skin pass mill is the final rolling process for building quality into products. The strip is rolled at an elongation rate of a few percent in the rolling direction while predetermined tensions are set to the entry and exit sides of the mill to improve flatness, eliminate the characteristic of yield point elongation, and control

## Optimization of a Cold Rolling Mill Thermo Fisher Scientific

maximum rolling speed of a cold or foil mill, 8 meters of strip is produced. It is easy to see why Automatic Gauge Control (AGC) is an essential component of modern rolling mills. Comprehensive AGC algorithms incorporate readings from dozens of sensors around the mill. Some of the key AGC input parameters are speed and tensionSimulating 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

## The Study of Continuous Rolling Mill Inter-stand Tension

rolling mill using different system for tension inferential control. The finished studies prove that size alignment is provided with the tension control system affecting speed of the further stands. The paper verifies that the characteristics of the rolling mill including aligning ability depend on the rolling ,