hot rolling mill roll eccentricity

ROLL ECCENTRICITY COMPENSATION (REC)

Rolls in rolling mills are never completely round but have eccentricity which can be caused by: • grinding inaccuracy • non-uniform thermal expansion • asymmetrical adjustment of bearing rolls shell via drive keys Each eccentricity consists of a base frequency which is the rotary frequency of the roll and several harmonic frequencies.

The Complete Technology Book on Hot Rolling of Steel

Hot rolling mill thus helps in reducing the size of a metal thereby molding it into the desired form and shape. Rolling mills perform the function to reform the metal pieces such as billet and ingot whilst maintaining its well equipped micro structure into bar, wire, sheet, strip, and plate. Hot rolled products are frequently categorized

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

Jul 01, 2007· This paper considers some of the control issues in hot rolling mills. Hence to set the context, first we give a brief description of a typical process. The role of a hot strip mill process is to roll the slabs produced in a continuous casting process and produce strips of thickness 0.8–20 mm. Fig. 1 shows a typical layout of a hot strip mill.

Rolling (metalworking) - Wikipedia

Hot rolling is a metalworking process that occurs above the recrystallization temperature of the material. After the grains deform during processing, they recrystallize, which maintains an equiaxed microstructure and prevents the metal from work hardening. The starting material is usually large pieces of metal, like semi-finished casting products, such as slabs, blooms, and billets.

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 …

How To Control Eccentricity Problem In Hot Rolling Mill

Roll Eccentricity Control Methods Passive roll eccentricity control methods Active roll eccentricity control methods. Examples are suitable roll cooling and lubricationsystems to fully utilize the advantages of HSS rolls in hot strip mills, and selective roll cooling systems as a method to control the flatness of the strip in cold rolling mills.

Roll Cooling | Lechler

In the metalworking rolling process in hot and cold rolling mills, heat is generated by friction and deformation in the mechanical forming of the rolling stock. As a result, efficient cooling of the rolls as well as the surrounding roll area is essential for the forming process in order to ensure stable roll temperatures and effective heat ...

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

Nov 12, 2013· trolling the roll gap position is such that produces the desired output thickness [6]. Roll eccentricities are caused by axial deviations between the roll barrel and the roll necks due to irregularities in the mill rolls and/or roll bearings [11]. These irregularities cause cyclic deviations in the strip thickness at the output of a mill stand.

US3543549A - Rolling mill control for compensating for the ...

Roll eccentricity correction system and method US4038848A (en) * : : , Ltd. Method and apparatus for controlling eccentricity of rolls in rolling mill DE2605183A1 (en) * : : Ltd: Means for controlling the thickness of the rolling in a rolling mill

US4274273A - Temperature control in hot strip mill ...

1. In a hot strip rolling mill including at least one mill stand having opposed work rolls where a metal workpiece is reduced in thickness by passing the workpiece between said opposed work rolls, said mill stand having means to sense the force applied to the workpiece and at least one controllable water spray means positioned adjacent thereto, a method for controlling the temperature of the ...

Active compensation of roll eccentricity in rolling mills ...

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, like e.g. inexact roll grinding or nonuniform thermal expansion of the rolls.

Method of measuring and compensating roll eccentricity of ...

A rolled plate with uniform thickness and flatness from a rolling mill is a goal constantly pursued by many steel plate manufacturers. Among the various factors which affect the thickness and flatness of the rolling plate, eccentricity of the backup roll is most decisive.

Hot Rolling, Cold Rolling & Grain Flow in Rolling Process ...

Nov 02, 2019· Hot Rolling Process Cold Rolling Process Grain Flow in Hot Rolling Process Grain Flow in Cold Rolling Process e4education For detail note Visit: https://

Online Monitoring System Design for Roll Eccentricity in ...

Abstract: This paper deals with the parameter estimation and online monitoring of roll eccentricity in rolling mills. Roll-eccentricity-induced disturbances can result in strip thickness deviation and product quality degradation, and a conventional control strategy cannot regulate this kind of periodic disturbances due to its complex characteristics.

hot rolling mill roll eccentricity

hot rolling mill roll eccentricity pochirajucoin Neural network for identification of roll eccentricity in rolling mills Feb 16, 1999 The roll eccentricity in a rolling mill may define the limit of thus is subject of interest for the automation equipment in hot rolling mills as well as.

application of an agc in hot strip rolling mills

Hot Rolling Mill Roll Eccentricity Crushing. Temper Hot Cold Rolling Mill Steel Equipment. Cold rolling bliss can assist customers in selecting the proper mill configuration and sie it specifically for the bliss can provide mills in two or four high roll arrangements include reel to reel installations, inline mills…

Dynamic modelling and simulation of a hot strip finishing mill

Jul 01, 2009· A finishing mill performs a set of operations in a hot strip rolling mill, and is a complex unit including many processes and control loops. Its modelling is a challenging task due to the variety of phenomena that occur within the mill, and variable transport delays. ... Roll eccentricity is a general term implying the out-of-roundness of ...

Hot Rolling of Metals: With Diagram | Industries | Metallurgy

Most primary rolling is done in either a two high reversing mill or a three-high continuous rolling mill. Final products from hot rolling include plates, strips and a wide variety of bars and sections. Plates and strips are normally rolled between two plain cylindrical rolls, or on four-high mills. a. Two-High Reversing Mill:

Reducing thickness variation of hot rolled steel strip by ...

Jul 18, 2013· (2009). Reducing thickness variation of hot rolled steel strip by non-circular back-up roll geometry. Ironmaking & Steelmaking: Vol. 36, No. 2, pp. 133-140.

CiteSeerX — ROLL ECCENTRICITY CONTROL WITH THE FORCE …

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 replace their ...

How to Reduce the Operating Cost of Rolling Mill Rolls ...

Feb 08, 2019· The rolling mill rolls operation cost is high, and it is one of the biggest concerns of the manufacturers across the country. It has to be done carefully and to achieve the low operating cost without letting it affect the quality of the final product; the following things are required to be considered. So here are a few things that will help you to reduce the operating cost of the rolling mill ...

Online Monitoring System Design for Roll Eccentricity in ...

roll bearings in mill stand can be defined as roll eccen tricities, which will not o nly result in the periodic disturbances on strip thickness, but also can cause the degradation on contr ol

hot rolling mill roll eccentricity

hot rolling mill roll eccentricity. hot rolling mill roll eccentricity pochirajucoin Neural network for identification of roll eccentricity in rolling mills Feb 16, 1999 The roll eccentricity in a rolling mill may define the limit of thus is subject of interest for the automation equipment in hot rolling mills …

HOT ROLLING PRACTICE – An Attempted Recollection

motors. These are known as mill stands. The layout of a rolling mill varies, from a simple single stand mill to several stands positioned either side by side or in a line. A mechanism, commonly called a roller table, directs the work piece to the rolls, and another roller table for handling the pieces emerging out of the roll.

Active compensation of roll eccentricity in rolling mills ...

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 ...

Advanced Reversing Cold Mills by Primetals Technologies

Depending on the product mix, a single-stand cold rolling mill can deliver rolling capacities of 100,000 to 400,000 t/a. Rolling schedules can be carried out with an even or odd number of passes to maximize mill availability and performance.