
POWER IN ROLLING IDCOnline
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.
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Rolling Mill Horsepower Calculation
expression for roll load roll torque mill horsepower The performance of the rolling mill depends on the Universa for calculation of roll force and torque 34 Chapter 8 or the roll
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Method of load calculation of electrical drives of rolling
During manufacturing of heavy strips and plates from difficulttoform steel grades on sheet and widestrip rolling mills there is a problem of exact calculation of power parameters of rolling. It...
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(PDF) Methodology for Calculation of Rolling Load and
For actual power requirement we have consider the HOT ROLLING THEORY and calculated the required power and torque for rolling process. Gear force calculation: Gear Profile Calculation:• Material of Gear EN9 (BS 970)• Helix angle ψ 26.6 degree • Pressure angle Ø 20 degree Effect of Temp. on Strength Analysis of Rolling Load (P) using Hot Rolling Theory Conclusion:From above calculations we can say that the torque obtain for rotating the transmission gearbox of rolling
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Calculation of Rolling Load and Torque in the Hot
9/1/1962· This paper presents a completely new approach to the mechanics of the Sendzimir hot planetary rolling mill. Previous work on this subject, by R. Tovini, included determinations for the distribution of the advance of the strip, the draft, the rolling load, the torque and the horizontal backthrust for the whole range of positions which the planetary rolls made, whilst contacting the hot metal.
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Deformation Processing Rolling
Hot rolling (above recrystallization point) strain rate effect, plane strain von Mises • Average strain rate = = f R b h h L V t ln ε ε& m 2τflow =1.15⋅Yflow =1.15⋅C⋅ε& average flow stress: due to
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Ball Mill Design/Power Calculation
6/19/2015· The basic parameters used in ball mill design (power calculations), rod mill or any tumbling mill sizing are; material to be ground, characteristics, Bond Work Index, bulk density, specific density, desired mill tonnage capacity DTPH, operating % solids or pulp density, feed size as F80 and maximum ‘chunk size’, product size as P80 and maximum and finally the type of circuit open/closed
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Load Analysis and Driven Power Calculation (Symmetrical 3
And the calculation of driving power of the main drive system is the necessary parameter for designing the main drive system and selecting the motor. Therefore, the calculation of the force analysis and driving power of the plate rolling machine is very important to the design of the roll bending machine.
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Fundamental concept of metal rolling mtixtl
In the case of no friction situation,the rolling load (P) is given by the roll pressure (p) times the area of contact between the metal and the rolls (bL p). P= pbLp = ob R∆h σ' Where the roll pressure (p) is the yield stress in plane strain when there is no change in the width (b) of the sheet. Eq.8 1) No friction situation Tapany Udomphol
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PROCESS OF ROLLING MILLS
2/25/2016· If a mill rolls 80 % of the calendar year, that is 365 x 24 x 0.80 = 7008 hours. If the mill rolls 800,000 tons per year, it runs at an average production rate of 114.16 tons/hour. If the...
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The Calculation of Roll Force and Torque in Hot Rolling
Equations are derived for the normal roll pressure, specific roll load and torque in hot rolling mills, using the condition for plastic deformation in rolling derived by
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Mill load roll force, torque, power during steel rolling
calculation is needed for an existing mill when a new rolling process is applied either with higher reduction or in lower temperature or higher speed, or for a stronger material. This is to make sure the force, torque, etc. are not over equipment capacity. In building a new mill, motor selection,
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Fundamental concept of metal rolling mtixtl
under very high rolling loads. If the deformed radius R’of a roll under load is given in Eq.11,using C= 2.16x1011 Pa1, P’=13.4 MPa from previous example. ( ) − = + bho hf CP R R ' ' 1 Eq.11 Where C = 16(1νννν2)/ππππE,P’= Rolling load based on the deformed roll radius. ( ) m x x x R 0.464 0.76 0.012 2.1610 13.4 10 0.451 11 6 ' = = + −
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Rolling Theory Analysis and Forces Calculation of Heavy
The heavy shell ring rolling mill which produces the large shell ring used in nuclear power, largescale hydrogenation reactor and coal liquefaction reactor was taken as subject investigated.
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Rolling of Metals
•Power per roll (SI units)= pFLN / 60,000 kW •Where F is in Newtons, L is in meters, and N is rpm of roll •Power per roll (English units) = p FLN / 33,000
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Required Energy Calculation by Hot Rolling of Tubes and of
2 Calculation Methodologies. The calculation of energetic and power parameters includes the following steps [5], [6]: dimensional pipe featuring in each rolling stage as well as of the performed deformation regime; determination of required deformation resistance and mechanical work for performing the rolling operation;
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Basics of Rolling and Rolling Mills IspatGuru
5/30/2013· Power which is applied to the rolling mill by applying a torque to the rolls and by means of work piece tension. The power is spent principally in four ways namely (i) energy needed to deform the metal, (ii) energy needed to overcome the frictional force, (iii) power lost in the pinions and power transmission system, and (iv) electrical losses in the various motors and generators.
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A BASIC UNDERSTANDING OF THE MECHANICS OF ROLLING MILL ROLLS
Rolls are tools used in rolling mills to reduce the cross section of metal stock. The weight of rolls may vary from a few kilograms up to 250 tonnes. Under rolling conditions the contact area between roll and stock suffers wear, the other parts of a roll body and necks have to be considered as normal parts of designed components under high load.
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Technical Report UDC 621 . 771 . 25 Progress of Bar and
the roughing and first intermediate rolling mill, a large dimensional fluctuation reaching as high as ±0.74 mm is caused by the influence of the varying number of simultaneous parallel rolling processes. Conventionally, the large fluctuation in dimensions could not have been damped by the second intermediate rolling mill and the finishing mill.
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