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P. Kucsera et al. Hot Rolling Mill HGC Thickness Control Improvement – 96 – Figure 2 Measured mill stretch characteristic When the mill is loaded, the mill stretch force is measured by load cells or calculated from the measured HGC pressure and can be used to calculate the actual mill stretch.

Secondary scale on hot strip and the impact on wear is another issue. Stresses from Hertzian pressure in 4-high cold mill back up rolls were measured years ago, the results were never published, but of high interest - also, maybe later. K. H. Schröder July 2003 K. H. Schröder: A BASIC UNDERSTANDING OF THE MECHANICS OF ROLLING MILL ROLLS

Rolling mill roll design Jing, Limei How to cite: Jing, Limei (2001) Rolling mill olrl design, Durham theses, Durham Universit.y ailvAable at Durham ... 3.7.3 Experimental Method in Section Rolling 36 3.8 A Example for Calculating Rolling Separation Force 37 3.9 Summaries and Conclusions 40 ... Chapter 7 Matrix-based Hot Rolling Roll Design 7 ...

Rolling processes 5-1 introduction: Rolling is the process of reducing the thickness or changing the cross section of a long workpiece by compressive forces applied through a set of rolls, as shown in figure (5-1). Fig. (5-1) Most rolling is carried out by hot working, called hot rolling, owing to the large amount of deformation required.

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Equations are derived for the normal roll pressure, specific roll load and torque in hot rolling mills, ... There is close agreement between the calculated and measured roll loads, but the roll torque is over-estimated slightly by the theory, above reductions of about 30 per cent in thickness. References.

P. Kucsera et al. Hot Rolling Mill HGC Thickness Control Improvement – 96 – Figure 2 Measured mill stretch characteristic When the mill is loaded, the mill stretch force is measured by load cells or calculated from the measured HGC pressure and can be used to calculate the actual mill stretch.

Mar 31, 2015· ThyssenKrupp Steel Europe spent a quarter of a million euros on renovating its hot-strip rolling mill in Duisburg. The animation shows how it all works.

1 HOT ROLLING PRACTICE – An Attempted Recollection Saral Dutta. B. Tech. (Hons.), I.I.T. Executive Director, ISP & RMD, SAIL (Retired) Rolling is a metal forming process in which metal stock is passed through a pair of rolls.

May 27, 2016· It is well known that there are sharp peaks (friction hills) in the specific roll pressure curves predicted by Sims formula and Цeликoв formula which result in large errors for hot rolling. In this paper, a new specific roll pressure formula is derived from the Navier-Stokes equation (N-S equation) by the hydrodynamics method (HM) with assumptions that strip materials take the ...

Mar 10, 2009· A tandem mill is a special type of modern rolling mill where rolling is done in one pass. In a traditional rolling mill rolling is done in several passes, but in tandem mill there are several ...

REVERSING COLD MILL Advanced reversing cold-mill technology from Primetals Technologies is an ideal solution for small- to medium-sized production capacities, or for the rolling of smaller order lots of special steel grades.

Feb 25, 2016· In the rolling of hot steel, this is not a difficult problem and iron or steel rolls are suitable if they are operated at a temperature considerably lower than that of the rolling stock.

Apr 23, 2012· (Roll forming: ) This film takes you through the processes within a hot rolling mill. You'll get to see the different stages all t...

When hot rolling steel in the laboratory, using relatively small rolling mills, values of 4–20 kW/m 2 K appear to be the correct magnitudes. If modelling hot rolling of steel under industrial conditions, values of 50–120 kW/m 2 K are more useful. In both cases, the layer of scale is an important parameter.

The result indicates that hot strip rolling mill vibration resulting from entry thickness deviation can be reduced by increasing the area of the hydraulic cylinder piston side and the entry thickness as well as by decreasing the deformation resistance, rolling speed, and equivalent stiffness. ... The neutral angle can be calculated by the ...

Methodology for Calculation of Rolling Load and Forces Acting On Herringbone Gear Using Hot Rolling Theory

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.

The ratio λ = [ a/Lp] = [a/√R.∆t] is used to calculate the moment arm 'a' λ =0.5 for hot rolling and 0.45 for cold rolling. The torque is equal to the product of total rolling load and the effective moment arm. Since there are two work rolls Torque Mt = 2P.a Consider two high roll mill as shown in the figure.

Dec 03, 2015· Attributes imparted to the strip by the hot rolled strip mill include surface quality, thickness, width, and flatness control as well as strip profile. Rolling of steel slabs in hot strip mill consists of several sub-processes and at the end of them the final product 'hot rolled coil' is produced.

3.2 Solution Methodologies for Hot Rolling Scheduling 22 3.3 Solution Methodologies for Hot Rolling Sequencing 30 3.4 Architecture Design for ISP Optimization Solutions 41 4 Sequencing Optimization for Hot Rolling Mill Production 46 4.1 An Overview of the Problem in Context 46

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