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Development of general set-up model leads to the mill automation. The present work is an attempt towards that. Hence, it has been decided to use a one-dimensional model presented by Suryanarayana [2], to develop a set-up model for tandem cold rolling mill under the constraints which are discussed in later section. 2.
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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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3.1. Roll force and torque variations during the process. In this study, the experimental rolling programs of Hum, Colquhoun, and Lenard (Citation 1996) are used to investigate the rolling force and torque changes during HSR of commercial pure aluminum.Typical contact pressure distribution in the roll gap is given in Figure 1, in which an AA1100 strip with 6.28 …
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The paper describes a method to calculate required torque of an electric drive of run-out table rollers in a variety of strip delivery modes, using results of experiments carried out on mill 2000 at public company "Magnitogorsk Iron and Steel Works" (MMK). ... Control method for roller table driving of rolling mill. Pat. JPH091219 (A ...
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T rm = Rolling torque which is converted to motor shaft taking into account the gear ratio between motor shaft and the rolls. T fm = Torque for overcoming friction in the roll neck bearing (converted to motor shaft). T trm = Torque to overcome friction in transmission …
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The rolling resistance for all four wheels in a car with total weight 1500 kg on asphalt with rolling friction coefficient 0.03 can be estimated with the generic equation 1 as. F r = 0.03 (1500 kg) (9.81 m/s 2) = 441 N = 0.44 kN. compare car rolling resistance with car air resistance (drag) The rolling resistance for one wheel can be calculated as
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A mathematical model of friction coefficient was established to calculate the roll force during hot strip rolling process. Firstly, a linear regression model with four input variables was proposed to describe friction behavior, namely rolling speed, strip temperature, reduction rate, and the number of rolled strips since roll change. Then, the …
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Fluctuations of roll force and torque about the steady-state operating point are derived and the effects of main process parameters such as rolling speed and strip reduction on …
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These simulations include optimiTation of roll pass sequence, calculation of roll force, torque and temperature and detailed time studies for productivity calculations. ... the simulation of hot rolling mills. These calculations constitute interacting loops that ... To start the iteration, some reasonable dimensions of the ...
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The start-up torque of a mechanical system is the minimum torque required to get it moving from a standstill. the start-up torque of a motor is the maximum torque which it is capable of producing from a …
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The calculation of roll force and torque in hot rolling mills. Proceedings - Institution of Mechanical ... critical deformation start ( ) for dynamic and metadynamic recrystallization to initiate ...
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The initial starting torque requirement is the breakaway torque - the torque required to start the machine from a standstill. Once the motor has begun to rotate the torque becomes the sum of the work torque and the accel-eration torque. The work torque is the torque required to overcome the mechanical work being done by the ma-
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The rolling mill has a power capacity of 5 MW per roll. The rolls rotate at a constant angular speed of 100 rev/min. The steel work material has the following flow curve at the rolling …
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quantity, but a calculation coefficient used for a simplified roll torque calculation procedure, as discussed in detail by Kastner and Kastner.[l 7l In a previous paper, I141 …
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For the formula of how many inch pounds of force to start a 3 pound box on 4.0 degree slope on 1.9"OD rollers I have seen this data, maybe you can verify if it is correct. F start = W * Sin 4.0 degrees. = 3 lb * Sin 4.0 degrees. = .157lbs. F …
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The authors analysed the known analytical dependencies for calculating the rolling mill force and torque. A mathematical model of the deformation zone and a program for …
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2.1 Dynamic Model. The rolling mill drive system mainly consists of the motor, reducer, main shaft, speed divider, arc gear shaft, work roll and bearings at corresponding parts [].The torsional vibration is often closely related to the dynamic energy transformation process of the rolling interface, which causes the relative speed between …
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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 …
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PDF | On Jan 1, 2020, Antonio Adel dos Santos and others published CALCULATION OF ROLLING FORCE IN THE HOT STRIP FINISHING MILL USING AN EMPIRICAL MODEL | Find, read and cite all the …
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The main factor influencing the rolling force required to reduce the thickness of strip in a rolling mill is the yield strength of the material being rolled. The calculation of yield strength depends upon a wide range of factors. These are: composition; previous work done on the material; thermal history; speed of rolling; change in thickness
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torque detector in the AC/DC drive unit. It is mainly used in roughing mill and intermediate mill area. It is generated when the rolling torque exceeds the nominal torque by 25%. − Cutting signal, which is generated instantly when the blades of the flying shear is closed. These material detection signals can only be used for the
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Phynight. Oct 16, 2022. Calculations Force Rolling. In summary, the forces needed to separate a steel sheet using a rolling mill are dependent on the stress-strain characteristic of the material, and the …
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Abstract and Figures. The state-of-the-art of both technology and operational practice of a hot rolling mill are discussed. The focus is first on the control of entry temperature in the finish ...
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2.3.3 Formulae for calculation of mean rolling pressure 93 2.4 Rolling Torque and Power 98 2.4.1 Lever arm method 98 2.4.2 Rolling power calculation 101 3. Rolling Practices 104 3.1 Layout of Stands 105 3.1.1 Single stand 105 3.1.2 Multi stands side by side 105 3.1.3 Looping train 106 3.1.4 Two-stand tandem mill 107
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last finishing mill, the coiler entered the stage of tension control. Strip tensions are mainly provided between mandrel and pinch roll, between pinch roll and finishing mill. In order to make full use of the motor torque, the tension control system adopts the maximum torque method [2]. The basic control process is: when the mandrel
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The algorithm behind this torque calculator is based on the equations provided below that depend on the variable to be calculated: - T = F * D. - F = T / D. - D = T / F. Where: T = Torque (usually expressed in Newton-meter). F = Force (often measured in Newton). D = Distance (often expressed in meter). Torque can be defined asthe tendency of a ...
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The rolling mill has a power capacity of 5 MW per roll. The rolls rotate at a constant angular speed of 100 rev/min. The steel work material has the following flow curve at the rolling temperature: MPa. Assume the coefficient of friction µ= 0.2. Is the available rolling mill adequate for the desired operation? m h i=75 mm h f = 60 mm
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The speed of the rolling mill is set at 10 rpm, giving a roll surface velocity of 70.69 mm/s. It was found necessary to use guides for the bars, both at entry and exit, in order to minimize sideways bending. The parameters monitored during the experiments include the temperature, roll force and torque.
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What makes the new method distinctive are the more precise equations used for calculation of rolling pressure and static torque during heavy plate rolling. Torque equation is written as 0 2 2 01 ...
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The looper control of hot strip finishing mill is one of the most critical control items in hot strip rolling mill process. It is a highly complex nonlinear system, with strong states coupling and uncertainty that present a difficult control challenge. ... Sims RB (1954) The calculation of roll force and torque in hot rolling mils. Proc Inst ...
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