Hot Rolling Mill Roll Eccentricity

Cold Rolling — Metals Magazine

Roll-Eccentricity Compensation (REC) eliminates the influence of roll eccentricity on strip thickness or tension. ISSUE #06 (MAR 18) 01.03.2018

Hot Rolling Mill Hydraulic Gap Control (HGC) thickness ...

P. Kucsera et al. Hot Rolling Mill HGC Thickness Control Improvement – 98 – Another way to determine the thermal expansion of the work roll is the modelling of the heat transfer between the work rolls and the strip.

(PDF) Damage in hot rolling work rolls - ResearchGate

A.P. 996, 64000 Monterrey, NL, Mexico. ´. Accepted 11 January 1999. Abstract. Samples from a couple of work rolls employed in a hot rolling steel strip mill were examined by scanning electron ...

FAULT DIAGNOSIS OF ROLL SHAPE UNDER THE SPEED …

find both eccentricity magnitude and eccentricity location in the roll as shown in Fig.10. But, as shown in Fig.12, not only magnitude of eccentricity but also location of eccentricity in the roll is obtained. 4.2 Simulations with Field Data Fig.13 shows a simplified multi-stand hot rolling system. The rolling system consists of seven stands.

Strip Thickness Control of Cold Rolling Mill with Roll ...

Roll eccentricity is not part of the controller but must be considered to be consistent with data reported from operating mills which . Figure 3. Effects of roll eccentricity on output strip thick- ness. usually includes its effects. The eccentricity components remaining in the mill exit thickness after compensation.

Roll eccentricity compensation based on anti-aliasing ...

Roll eccentricity is an important factor causing thickness variations during hot strip rolling and might define the limit of strip thickness control accuracy. An improved multi-resolution wavelet transform algorithm was proposed to compensate for the roll eccentricity. The wavelet transform method had good localization characteristics in both the time and frequency …

Non-circular grinding of backup rolls to reduce rolling ...

This paper is concerned with the active compensation of the roll-eccentricity-induced periodic disturbances in the strip exit thickness of hot and cold rolling mills. The roll eccentricity may be ...

Strip Thickness Control of Cold Rolling Mill with Roll ...

In rolling mill, the accuracy and quality of the strip exit thickness are very important factors. To realize high accuracy in the strip exit thickness, the Automatic Gauge Control (AGC) system is used. Because of roll eccentricity in backup rolls, the exit thickness deviates periodically. In this paper, we design PI controller in outer loop for the strip exit thickness while PD controller is ...

overall process flow diagram of rolling mills

During hot rolling the microstructure and mechanical properties of the material change with its thermomechanical state determined by composition percent reduction strip thickness strip speed and heat transfer For steels hot rolling is generally conducted at 850–1200 176C in the austenite phase while for aluminum it is conducted at 350–500 176C

Hot rolling flat — Metals Magazine

Roll-Eccentricity Compensation (REC) eliminates the influence of roll eccentricity on strip thickness or tension. ISSUE #06 (MAR 18) 01.03.2018

CiteSeerX — ROLL ECCENTRICITY CONTROL WITH THE …

CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): The Force Feed Forward (FFF) System is the only hot strip mill AGC system in the world today which does not incorporate the BISRA principle for gage control. Instead, using a revolutionary control algorithm, FFF has proven in five installations in North and South America, that steelmakers need not …

quality, a powerful controller is need- Rolling mill simulator

Rolling mill simulator A new platform for testing, analysis and optimization of cold rolling mills. Axel Brickwedde, Frank Feldmann, Nicolas Soler The cold rolling of flat metal products especially in tandem or multi-stand mills is a highly complex process where the product quality is influenced by various aspects.

A SURVEY OF THE LOOPER-TENSION CONTROL …

abnormal rolling condition. Thus, the speciﬁcations of dimensional quality 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 …

| Primetals Technologies

Aluminum Hot Rolling Mill. Integrated Solenoid Valve (ISV) Spray System. ISV Roll coolant spray bars for hot and cold rolling mill strip flatness control. Coil Eccentricity Expert. Elimination of a known strip quality disturbance. EdgeMon. Inspection of side-trimmed strip edge surface for steel pickling and processing lines and aluminum rolling.

(PDF) Chatter in steel rolling - ResearchGate

lems with the roll eccentricity or various sorts of ... sional vibrations in hot rolling mills and a possible remedy. ... Mathieu's equation to predict the stability criterion of a roll alignment ...

Home | POMINI Long Rolling Mills

A comprehensive portfolio of solutions for the hot rolling of bars, coils, sections and rails. An expertise enriched by the historical brands of POMINI Long Rolling Mills, Ashlow and GFM. A profound knowledge and understanding of the processes. A relentless pursuit to improve and innovate the technologies.

Endless Rolling Mills from the Market Pioneers | Primetals ...

Full-scale endless hot rolling. Our solution Joining bars very quickly (in less than 0.5 seconds) and reliably without a need for heating. Equipment using this new joining process has been incorporated into the No. 2 hot rolling mill at POSCO's Pohang Works, enabling full-scale endless hot rolling.

Roll Eccentricity Control Using Identified Eccentricity of ...

Roll eccentricity is a periodic disturbance caused by a structure of back up rolls in rolling mills, and it affects product thickness accuracy. It cannot be measured directly by sensors, so it should be identified by measured thickness or measured roll force. When there is a large difference of diameters between top and bottom back up roll, the performance of roll eccentricity control …

Application of Dynamic Deadband Eccentricity Filter in GM ...

Therefore, the GM-AGC system in hot finishing mill of an aluminum plant uses the dynamic deadband eccentricity filter (DDEF) whose deadband width varies with the amplitude of the roll eccentricity signal. The operating principle of DDEF was introduced according to the characteristic of roll eccentricity signal.

Thickness Control for a Steel Beam - MATLAB & Simulink

Rolling Stand Model. Figures 1 and 2 depict the process of shaping a beam of hot steel by compressing it with rolling cylinders. Figure 1: Beam Shaping by Rolling Cylinders. Figure 2: Rolling Mill Stand. The desired H shape is impressed by two pairs of rolling cylinders (one per axis) positioned by hydraulic actuators.

ROLL SPEED SET-UP IN HOT STRIP FINISHING ROLLING MILL ...

Hot strip finishing mill is initially set up with rolling conditions such as roll speed, roll gap, and cooling pattern obtained by a set-up model. To improve the accuracy of initial roll speed setting for a 7–stand finishing mill, an equation for predicting forward slip and a compensation method for initial roll speed setting were proposed ...

Loop monitoring and assessment of hot strip mill control

casted steel slabs and rolled in two stands down to desired thickness. The ﬁrst stand is a conventional roughing mill. The last stand is a steckel mill. It is a special rolling technique that is only used in a small number of hot strip mills in the world. When this special technique is used, the demand on the control is high.

Rolling of Metals

Rolled Metal Characteristics • Residual stresses • Dimensional tolerances for cold-rolled sheet thicknesses +/- 0.1 mm to 0.35 mm (0.004 to 0.014 inch) • Flatness tolerances to within +/- 15 mm/m (3/16 inch/foot) for cold rolling, +/- 55 mm/m (5/8 inch/foot) for hot rolling • Hot rolling and sand casting produce similar ranges for

[PDF] Hot Rolling Mill Hydraulic Gap Control ( HGC ...

The mill stretch compensation and other disturbances during the rolling process are compensated and a rolling speed dependent, adaptive PI controller is developed to accomplish fine thickness control. The improved system has been validated by measurements. Future improvement options are also analyzed, like eccentricity compensation, and… Expand

Roll Eccentricity Extraction Method Based on Comprehensive ...

Roll eccentricity is ubiquitous in strip mills, which has a periodic impact on the strip thickness difference. Roll eccentricity compensation is an important part of the automatic gauge control system. Most roll eccentricity compensations extract the roll eccentricity based on the frequency domain analysis of the rolling force.

Roll Eccentricity Control for Strip Rolling Mills ...

A key characteristic of roll eccentricity disturbances is that they are not stationary. That is. although the initial waveform for each roll may be the resul t of grinding practices and bearing characteristics. the resultant waveform due to all rolls may change due to non-uniform thermal expansion and wear. and other factors.

Hot Rolling Mills Solutions | Nidec Industrial Solutions

ARTICS Hot Rolling Mills Real time control for Hot Rolling Mills. With more than 50 years of experience, Nidec Industrial Solutions has developed a vast array of functions based on auto-adaptive mathematical models that optimize rolling schedule calculations in real time.

Hot Rolling Mill - YouTube

(Roll forming: )This film takes you through the processes within a hot rolling mill. You'll get to see the different stages all th...

Rolling mill roll eccentricity control - Kaiser Aluminum ...

The invention relates to the control of rolling mill backup roll eccentricity by combining the load carrying characteristics of rolling mill tapered roller bearing assemblies during rolling with prescribed levels of axial thrust to effect a controlled deflection of backup roll necks on a 4-high rolling mill or the like due to the selected thrust force applied axially to the ends or necks of ...

Neural network for identification of roll eccentricity in ...

The roll eccentricity in a rolling mill may define the limit of achievable thickness tolerances and thus is subject of interest for the automation equipment in hot rolling mills as well as in cold rolling mills. Today's demand on thickness tolerances less than 0.8% require efficient methods for roll eccentricity identification and compensation.

GB2059316A - Temperature control in hot strip mill ...

GB2059316A GB8029087A GB8029087A GB2059316A GB 2059316 A GB2059316 A GB 2059316A GB 8029087 A GB8029087 A GB 8029087A GB 8029087 A GB8029087 A GB 8029087A GB 2059316 A GB2059316 A GB 2059316A Authority GB United Kingdom Prior art keywords workpiece temperature change mill spray Prior art date Legal status …