e pression for roll load roll torque mill horsepower

HOT ROLLING OF COMMERCIALLY PURE TITANIUM AND ,

The rolling mill was a 2-high/4-high experimental mill used as a 2-high mill, and was equipped with strain gage load cells and torque arms The load cells are described in Reference 1 The torque arms (Figure 1) replaced the top and bottom drive shafts and utilized a similar amplFfier and recorder system

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Weight Transfer: how it works and how to use it in setup

Jun 09, 2015· The term between brackets in the equation above is the roll rate distribution or roll stiffness distribution for a given axle, and it will ultimately control the elastic lateral load transfer component Elastic and Kinematic Components Combined So far, we have discussed the influence of each component in lateral load transfer in isolation

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Rolling of Metals

•Roll-strip contact length L •Average strip width w –despite the fact that spreading, or an increase in width, may actually occur if edger mills are not used •Average true stress of the strip in the roll gap Y avg •Assumes no friction and thus predicts lower roll force than the actual value •Power per roll (SI units)= pFLN / 60,000 kW

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The Calculation of Roll Force and Torque in Hot Rolling Mills

Jun 01, 1954· 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 Orowan, together with von Kármán's equation of equilibrium Although applying strictly to the rolling of ideal plastic-rigid materials, these equations may be applied to the ,

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Solved: A Hot Rolling Mill Has Rolls Of Diameter = 24 In ,

A hot rolling mill has rolls of diameter = 24 in It can exert a maximum force = 400,000 lb The mill has a maximum horsepower = 100 hp It is desired to reduce a 15 in thick plate by the maximum possible draft in one pass The starting plate is 10 in wide

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Problem 3-3 (7

The paper roll is 150-m outside diameter (OD) x 022-m inside diameter (ID) x 323-m long and is on a simple supported, hollow, steel shaft with Sut=400 MPa Find the shaft ID needed to obtain a dynamic safety factor of 2 for a 10-yr life is the shaft OD is 22 cm and roll turns at 50 rpm with 12 hp ,

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THE MECHANICS OF TENSION CONTROL

Torque required to provide a certain level of tension to a web is total tension measured across the web times roll radius This means the torque driving the unwind shaft must decrease at a linear ratio, relative to roll diameter, as an unwind roll decreases in size, through a machine run, to keep tension constant Conversely, the torque driving the

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Useful Motor/Torque Equations for EML2322L

Torque (1 in-lb = 0112985 N-m) Power (1 HP = 7457 W) Example 1 Determine if the following motor can be used to lift a 5-kg load using a 05-m lever arm Merkle-Korff Gearmotor specifications Stall Torque = 40 in-lb , to the ground before the wheel begins to roll (thus causing the robot to move) ,

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Basics of Web Tension Control Summary

1 = Nip roll velocity E = Elasticity of the material A = Cross sectional area of the material The larger the elasticity (E), the less likely the material is to stretch For most values of EA, use TORQUE CONTROL For stretchy material, where E is small, speed control can approach being as good as torque control

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How can we calculate the required torque to rotate 1200 kg ,

I would like to calculate torque to rotate 1200 kg of mass which is attached in 15" dia shaft Shaft is supported by 2 bearings at its end Neglect bearing frication

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Center Driven Winders & Unwinders | Tension & Speed Control

Typical full torque speed range for DC motors < 5 HP is 20:1 This means the motor can run continually at 1/20 of base speed at full torque without overheating DC Motors larger than 5 HP typically have a speed/torque range of approximately 2:1 unless auxiliary cooling is added Blower cooling typically extends the range to at least 10:1

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Experimental investigations of the roll load and roll ,

Fig 1 A standard roll forming mill is used to do experiments, the roll load is measured with load cells and the roll torque is measured with a torque sensor during a forming of different steels Table 1 The materials that have been tested are Docol, DC01 (carbon steel) and HyTens, SS2333 (stainless steel) Material Thickness (mm) RP02 (MPa ,

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Rolling processes - Al-Mustansiriya University

in one pass at a roll speed of 50 rev/min The work material has a flow curve defined by K = 275 MPa and n = 015, and the coefficient of friction between the rolls and the work is assumed to be 012 Determine if the friction is sufficient to permit the rolling operation to be accomplished If so, calculate the roll force, torque, and horsepower

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Engineering Data

HP = TORQUE x RPM or TORQUE = 63,025 x HP 63,025 RPM TORQUE = 63,025 x 1/12 = 5,252 In Lbs 1 Therefore, motors for use with large reductions should be carefully selected Even a small motor, if stalled, can produce enough Torque to ruin the drive, unless ,

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Rolling (metalworking) - Wikipedia

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, to make the thickness uniform, and/or to impart a desired mechanical property The concept is similar to the rolling of doughRolling is classified according to the temperature of the metal rolled If the temperature of the metal is above its ,

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Ball Mill Design/Power Calculation

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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US7059163B2 - Roll stand comprising a crown-variable ,

The invention relates to a roll stand comprising a crown-variable-control (CVC) roll pair, preferably a CVC working roll pair and a back-up roll pair, which comprise a contact area (B cont) in which a horizontally active torque (M) acts that leads to a twisting of the rolls and thus to axial forces in the roll bearings In order to keep the axial forces in the roll bearings as small as ,

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12 ROLLING, TORQUE AND ANGULAR MOMENTUM

Torque defined in this way has meaning only with respect to a specified origin The direction of the torque is always at right angles to the plane formed by the vectors r and F The torque is zero if r = 0 m, F = 0 N or r is parallel or anti-parallel to F 124 Angular Momentum

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Paper # 25 - Copper Mountain Overview on the Grinding ,

speed When zero speed is reached, the mill has stopped but the torque is still at a high level because of the unbalanced mill charge Then the drive system starts slowly in the reverse direction to roll back the mill until no torque is remaining in the system During this time, the ,

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Load Analysis of Rolls in a Rolling Mill: A Comparison of ,

the load is just transmitted from the rolls to the housing through the chocks Therefore the roll load is P = 04 Vout × E × Atotal Following are the results of the calculation of the roll load for various passes of the material through the rolling mill on the basis of the output voltage obtained in ,

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WIND TURBINE POWER, ENERGY, AND TORQUE

An expression for air density is given in Chapter 2 and is repeated here for convenience: ρ =3485 p T kg/m3 (3) In this equation, p is the pressure in kPa and T is the temperature in kelvin The power in the wind is then P w = 1 2 ρAu3 = 1742pAu3 T W(4) whereA is area in square meters and u is windspeed in meters per second For air at standard

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Grotnes Rotary Roll Forming Machine - Amazon S3

Maximum input torque continuous per spindle 1,000 inch lbs 1,800 inch lbs 4,800 inch lbs 6,500 inch lbs 25,000 inch lbs Spindle RPH HP per spindle 480 RPM/ 7Y2 HP 400 RP,M 110 HP 400 RPM /30 HP 500 RPM/ 50 HP 150 RPM /60 HP Maximum roll space: Diameter 3" ,

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ABB drives in metals Medium voltage drives for improved ,

Rolling mills demand high precision and high overload capability The mill is subjected to rapid change in load speeds, forcing equally quick generating and braking actions This demands a constant torque in a wide speed range and large torque steps ABB medium voltage drives are the perfect answer for the requirements of the metals industry

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Tapping Speeds & Torque Requirements

Tapping Speeds & Torque Requirements RPM = 382 x SFM Tap Diameter FEED (IPR) = 1 Pitch FEED (IPM) = Feed (IPR) x Speed (RPM) Tapping speeds are for general purpose taps Consult tap manufacturer for high geometry taps TAPPING SPEEDS Material Tapping Speed (SFM) Aluminum 90 - 110 Brass 80 - 100 Bronze 40 - 60 Copper 70 - 90 Copper-Beryllium 40 ,

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Calculation of Rolling Load and Torque in the Hot ,

Sep 01, 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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What Is the Formula for RPM? | It Still Runs

A small diesel engine produces 3 horsepower with 6 pound-feet of torque at what RPM? RPM formula = Horsepower times 5,252 constant (33,000 divided by 31416 times 2) divided by torque RPM = 3 HP times 5,252 divided by 6 foot pounds RPM = 15,756 divided by 6 equals 2,626 RPM

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Taper Tension for Rewind Control: Definitions & Processes ,

When the rewind roll diameter doubles again, the tension will drop by and additional eighth For example, when the initial tension is 80-lbs and the taper percentage is set to 40%, the tension will change from 80-lbs less 20%, (ie 64-lbs) when the diameter of the rewind roll doubl

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Predictive model for the cold rolling process through ,

M = 3922640 rigidity rolling mill modulus (N/mm) g = roll-gap (mm) The values of rolling load and rolling torque used for training were obtained through Alexander's model (1972) Table 2 shows the inferior and superior limits for the load and torque, obtained by simulation Training Process

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Deformation Processing - Rolling

– Find distribution of roll pressure – Calculate roll separation force (“rolling force”) and torque – Processing Limits – Calculate rolling power Prof Ramesh Singh, Notes by Dr Singh/ Dr Colton 13 Flat Rolling Analysis • Consider rolling of a flat plate in a 2-high rolling mill

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Solved: B1) A Plate (20mm Thick, 200 Mm Wide) Is Rolled To ,

Given: Roll radius = 250 mm and rotational speed = 12 rev/min The work material has a strength coefficient = 600 MPa and a strain exponent = 022 a) Sketch the operation and show any motion with arrow(s) b) Determine roll force, roll torque, and power required for two rollers

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