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The rolling process is shown in Fig. 2.1: Rolling is done both hot and cold. It is accomplishes in rolling mills. A rolling mill is a complex machine having two or more working rollers, supporting rollers, roll stands, drive motor, reducing gear, flywheel, coupling gear etc. Rollers may be plain or grooved depends upon the shape of rolled product.
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How pass line is calculated in hot rolling mill. The pass line is a line that runs parallel through the roll partings and passes through the centre of the stock area of each pass at every stand. Read more. Get Price. Cold Rolling Mill Operation/Project resume in Samastipur .
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wear of hot rolling mill rolls: an overview S. Spuzic*, K. N. Strafford*, C. Subramanian* and G. Savage** * Department of Metallurgy, University of South Australia, The Levels,
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It is of course well known that the pass-line of a rolling mill is the path of movement of sheet metal through the mill between the working rolls thereof. How is rolling mill torque calculated? The torque is obtained by integrating the frictional force multiplied by roll radius over the arc of contact (lagging and leading zones).
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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.
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HU Xian-leiL3’ introduced an optimization method of holding temperature and thickness for pass schedule calculation of two-phase controlled rolling on plate mill. However, for hot tandem roll- ing mill the capacity of shape control is not inex- haustible, and it is necessary to take into account shape control in rolling schedule.
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Roll pass design is a set of methods for determining the dimensions, shape, number, and type of arrangement of rolling mill passes. Roll pass design also includes the calculation of pressing forces and their distribution on the roll passes. Several passes are made for each section; a square or round billet or bloom acquires a specified form on ...
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However, the total rolling load can be assumed to be concentrated at point along the arc of contact ata distance 'a' from the line of centers of the rolls. 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.
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JSW Steel manufactures Hot Rolled (HR) coils at its state-of-the-art Hot Strip Mills (HSM), at Vijayanagar (Karnataka) and Dolvi (Maharashtra). Vijayanagar HSM-I and HSM-2 with commissioned capacities of 3.2 MTPA and 5 MPTA respectively are equipped with sizing presses and an automatic line inspection facility which makes this facility the widest Hot Strip Mill in India.
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At the present time, hot rolling mills can produce up to one mm thickness, but the usual minimum thicknesses are limited at 1.5 mm especially when rolling velocity reaches 15 m/s and over. Steel wire can be hot rolled with diameters as small as 5 mm at velocities as high as 100 m/s. Perhaps the major drawback of hot rolling is the surface ...
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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 …
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for cold rolling, +/- 55 mm/m (5/8 inch/foot) for hot rolling • Hot rolling and sand casting produce similar ranges for surface finish • Cold rolling produces a very fine surface finish • Gage number identifies standard thicknesses of sheet (the smaller the number, the thicker the sheet)
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PP Rolling Mills. tmt hot rolling mill roll pass desing how to do pass schedule calculation of hot tmt milltube mill design calculation force rollMineHow pass line is calculated in. Read more. rolling mills, tmt bar, gear box design, cold rolling ...
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Tags Pickle Lines, Rolling Mills; Temper Pass or Skin Pass Rolling. Material can be reduced accurately while skin passing. Hot rolled steel coming from a steel mill or pickle line may need to be reduced 1% to 2% in thickness. This can be done on a coil-to-coil temper pass mill or in line on a cut-to length line.
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ling the rolling force of the mill by a hydraulic screw-down control system. 2.3 AEC for skin pass mill of continuous processing line 2.3.1 Conventional AEC methods and their problems In most cases, an in-line skin pass mill of a CGL is installed at its center section (furnace section) and for this reason it …
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After heating, the strip is made of cold rolling mill and hot rolling mill. The finished steel of hot rolling mill is cooled to laminar flow to establish temperature band. It is coiled in the coil by winding machine, and coil cooling is a finishing operation according to different needs. Users straighten the cross-section of leveling line.
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Sadhan¯ a¯ Vol. 41, No. 1, January 2016, pp. 111–124 c Indian Academy of Sciences Effect of pass schedule and groove design on the metal deformation of 38MnVS6 in the initial passes of hot rolling R S NALAWADE∗, V R MARJE, G BALACHANDRAN and V BALASUBRAMANIAN Kalyani Carpenter Special Steel Pvt. Ltd., Mundhwa, Pune 411036, India
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Multi-pass Hot Rolling of Steels Multi-pass hot rolling is a general practice in the production of plates. An illustration of a plate mill, Fig. 1, is shown below to demonstrate how a series of processes are carried out to produce plates from steel slabs.
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Pass Schedule Calculation for a Hot Rolling Reversing Mill Language: Fortran IV. Objective: Pass Schedule Calculation for a Pilot Flat Hot Rolling Reversing Mill, using the method of Sims to calculate …
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SKIN-PASS MILL Excellent Flatness and a Perfect Finish The advantages of skin-pass mills (also known as temper mills) from Primetals Technologies include full compliance with tight strip elongation tolerances; excellent flatness performance; high surface quality with respect to roughness, peak count and low residuals; and the availability of wet and dry skin-passing modes.
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POWER IN ROLLING Power is applied to the rolling mill by applying ... The total rolling load is distributed over the arc of contact. However, the total ... 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.
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See sample "Calculating Drive RPM's" formula below: The left side of the data chart shows a cut away of a standard rework sheet after the tooling is reworked. On a typical standard mill configuration, write down the reworked throat diameter of the first breakdown pass, first fin pass, and first sizing pass.
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Roll pass design in continuous bar mills 1. African Foundries Ltd. Lagos, Nigeria Presented by Rahul Kishore 2. Basics of Rolling A rolling mill consist of several, at least two rolls cylindrical or nearly cylindrical bodies which are termed as "roll" and which rest in bearings at their ends. The normal and average center distance from the center of one roll to the center of o
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Direct connection of continuous casting and hot rolling for energy conservation was nearly an established practice in 19811), while a significant change was taking place in the field of cold strip rolling. That year, a new process directly linking a tandem cold mill with a pickling line, called a continuous descaling cold rolling mill (CDCM) 2),
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What Is A Rolling Mill? In metalworking, rolling is a metal forming process in which metal stock is passed through one or more pairs of rolls to reduce the thickness and to make the thickness uniform. The concept is similar to the rolling of dough. Rolling is classified according to …
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AdvantagesofAluminum Thepropertiesofaluminummakeitoneofthe mostadvantageousandversatilematerialsin usetoday.Aluminumis: Lightweight—Aluminumanditsalloys weigh ...
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be directed to the condition of the rolling mill. For multiple strand rolling the power availability of the finishing train is of great importance and need to be sufficiently calculated. The Process Guiding The guiding of the leader section to the forming pass and on to the separating pass in the separating stand is critical in order to ...
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Length Line "A" 219,25 Meter Length Line "B" 176,8 Meter *HOT ROLLING MILL "PRIMETALS" (Mitsubishi-) (2009) Capacity 3 Million TPY Width range 900 - 1650 mm Thickness range 1,2 - 16 mm Max Coil Weight 30 Ton Max Speed 760 M/Min. Two Stand 4-High Roughing Mill Five Stand 4-High Finishing Mill Cooling, Vert. Edger, AGC, Pass ...
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Oluwole OO, Olaogun O (2011) Slip line field solution for second pass in lubricated 4-high reversing cold rolling sheet mill. Engineering 3(12):1225–1233. doi: 10.4236/eng.2011.312152 Article Google Scholar
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only under so called "normal rolling conditions" and even these change continuously with progressive wear in the contact zone. Besides "normal rolling conditions" - a stable, theoretical assumption - mills experience many different changes in rolling conditions. After a roll change or a mill stop rolls need some time to return to stable
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Mill optimization of pass schedule crown distribution, roll profile determination, and on-line actuator set points have been developed according to two basic models and the weighted least square ...
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G. Engberg, L. Karlsson, in Fundamentals of Metallurgy, 2005 11.5.1 Hot rolling. Mill data from the hot strip mill has been used to calculate the mean flow stress in each pass, assuming the material to be elastic – ideally plastic. The roll force model used was a classical slab method with constant friction assumed in the roll gap. For the roughing mill (reversible 4-high) both roll force ...
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