Elimination of a known strip thickness quality disturbance from rolls. Improved strip quality, improved thickness tolerances also at high rolling speeds. Maintenance-friendly: uses existing thickness, roll load, or strip tension measurements as feedback for control, hence: easy to implement in existing basic automation environments.

1.3 Difficulties in control of rolling mills The environment in a hot strip mill is very harsh. Heat, vibrations, large forces and dust are constantly affecting equipment such as actuators and sensors. A failing sensor or a leaking hydraulic valve may have large impact on control performance.

The wall thickness eccentricity is one of the most important weaknesses that appears in seamless tubes production, since this imperfection is subsequently transferred downstream through the manufacturing stages until the final product. For this reason, in this article a finite element model of the rotary tube piercing (RTP) process is developed aimed at analysing the wall thickness ...

Estimated eccentricity of work roll [mm] in stand4 But, when the proposed diagnosis model as described by Eqn (6) with transformed rolling force data as shown in Fig.16 was used, both eccentricity magnitude and eccentricity location in cross sectional area …

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 …

Hot rolling flat Coil logistics, made simple The modular coil shuttle system from Primetals Technologies is the cost-efficient solution of choice for coil logistics in …

how to control eccentricity problem in hot rolling mill. how to control eccentricity problem in hot rolling mill. Neural network for identifiion 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.

The Hot Rolling Process The primary function of the Hot Strip Mill is to reheat semi-finished steel slabs of steel nearly to their melting point, then roll them thinner and longer through 12 successive rolling mill stands driven by motors totaling 77,000 hp, and finally coiling up the lengthened steel sheet for transport to the next process.

These studies had concentrated to improve the mill stretch design and the rolling speed control in order to accomplish fine thickness with respect to the compensation of the roll eccentricity and ...

The key equipme nt in hot/cold tand em rolling mills is the finishing mill g roup, which usually consists o f 7 mill stands in hot rolling and 5 mill stands in cold rolling.

Awtm/ia Abstract: An in-depth review of the roll eccentricity control design problem is prov­ided which encompasses a number of recent, novel, design contributions and includes experimental results from two separate steel, tandem cold rolling mill installations. A unifying approach to eccentricity control ~nables the diverse range of published ...

Abstract: 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 caused by different reasons, e.g., inexact roll grinding or nonuniform thermal expansion of the rolls. The increasing demands on the thickness tolerances require new methods for the active ...

Upgrading of Hot Finishing Mill to 4Stands, and Roll eccentricity elimination control PC1: Rougher master, table master PC2: Rougher submachine control master PC3: Machines around rougher mill control master, Automatic gauge control PC4: Slab cooling temperature control Figure 2 Configuration of computer control system for hot strip rolling mill Roll thermal crown calculation Finisher setup

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.

In this study, a new diagnosis method for roll eccentricity under the roll speed changes was developed. The new method was induced from analyzing the rolling mechanism by using rolling force models, radius-speed relationship, and measured rolling force, etc. Simulation results by using the field data show that the proposed method is very useful.

Hot rolling . Transformation Monitor . Cold rolling | Aluminum ... Chatterblock Mill-vibration control . Cold rolling . UCM Flat—the new flatness control . Cold rolling . Non-Stop Flying Roll Change ... Roll-Eccentricity Compensation . Cold rolling . Off-Gauge Optimizer ...

Rolling mill roll eccentricity control Kaiser Aluminum. In this article the AGC Automated Gauge Control system of a hot rolling mill is analyzed and different methods are described to improve its performance 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 ...

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 ...

These studies had concentrated to improve the mill stretch design and the rolling speed control in order to accomplish fine thickness with respect to the compensation of the …

roll eccentricity as regulating variable for rolling:[ ] …,roll eccentricity as regulating variable for rolling、、。

Consider the hot rolling of a low-carbon steel strip in a single stand roughing mill. Let the entry thickness of the slab be 20 mm and its width to be 2000 mm. Its resistance to deformation is taken to be 150 MPa. It is reduced by 30% using work rolls of 800 mm diameter, rotating at 50 rpm.

In order to meet the requirement for higher thickness accuracy in cold rolling processes, it is strongly desired to have high performance in control units. To meet this requirement, we have considered an output regulating control system with a roll-eccentricity estimator for each rolling stand of tandem cold mills. Considering entry thickness variation as well as roll eccentricity as the major ...

Hot Rolling Mill Roll Eccentricity Crushing,Hot Rolling Mill Roll Eccentricity Crushing Aggregate Crushing Plant South Africa Stone Crushing Plant Pakistan Sand Production Line 5070th Gold Ore Crushing Production Line in Malaysia 5000th Copper Ore Crushing Production Project in Kenya 500th Iron Ore Crushing Production line in South Africa 250th Granite Crushing Production Line in …

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.

bearings for rigorous applications in hot and cold rolling mills, while continuously improving the company's bearings and seals to keep pace with the demands of the metals industry. Timken engineering experience and know-how are reflected in the newest sealed roll …

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 using ...

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 ...

hot rolling mill roll eccentricity. Abstract This paper is concerned with the active compensation of the roll eccentricityinduced periodic disturbances in the strip exit thickness of hot and cold rolling mills The roll eccentricity may be caused by different reasons like eg inexact roll grinding or nonuniform thermal expansion of the rolls

Hot Rolling Mill Roll Eccentricity. The result demonstrated that the eccentricity influence of the first stand is the most serious and the eccentricity influence of the fifth stand in five-stand cold tandem mill is second. Furthermore the effect of watermarks before hot …

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 caused by different reasons, like e.g. inexact roll grinding or nonuniform thermal expansion of the rolls. The increasing demands on the thickness tolerances require new methods for the active ...