A rolling mill is characterized by the maximum values of its roll separating force and the torque. Cold rolling is a rolling operation carried out at room temperature. What is the significance of roll diameter with reference to the roll separating force in rolling?

Rolling Mill Startup Torque Calculation. The ratio alp art is used to calculate the moment arm a 05 for hot rolling and 045 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 2pa consider two high roll mill as shown in the figure more.

An improved calculation method for rolling pressure and load torque of electrical drive engine is suggested further. This method considers peculiar strain of product in high deformation zones and its accelerated motion in reverse mode. Improved analytical dependences for rolling pressure and load torque of electrical drive are reviewed.

Computer-aided design of rolling mills K G PANDEY MECON (India)Limited, Ranchi 834002, India Abstract. Comput,rs have been used for design of rolling mills since 1960s. ... calculation of roll force, torque ... To start the iteration, some reasonable dimensions of the

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. For one revolution of the top roll the resultant rolling load P moves along the circumference of a circle equal to 2π.a Since there are two work rolls ...

Calculations of rolling power needed and loads on mechanical equipment. The calculations of load, torque and power is done based on Sims formula from billet/bloom to finishing dimension as a function of geometry, steel grade, temperature and tension. The calculation of temperature is a function of power, dimension and heat transfer co efficient.

Methods of Control (Speed Control) ( ) 1 2 1 1 2 2 1 V EA V -V V V =T ⎟⎟+ ⎠ ⎞ ⎜⎜ ⎝ ⎛ R T 1 T 2 V 1 V 2 T 2 = Rewind tension V 2 = Rewind velocity Where: T 1 = Tension in the previous tension zone V 1 = Nip roll velocity E = Elasticity of the material A = Cross sectional area of the material

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

introduction theory of plasticity rolling mill rolling forces tribology mathematical modeling of rolling temperature effects on rolling recrystallization roll torque roll power influence of physical quantities other types of rolling –temper, acumulative, flexible results and …

Calculator-5. Known variables: Weight (lbs), Linear Velocity (ft/min), Speed of Driving Motor (RPM), Change in Speed (RPM), and Time to Accelerate Total System (sec) In addition to the torque required to drive the load at a steady speed, torque is required to accelerate the load. Accelerating Torque for Linear Motion. Input Weight, w (lbs) :

The lower roller of the plate rolling machine is the driving roller, and the driving torque on the lower roller is used to overcome the deformation torque T n1 and the friction torque T n2. In the process of steel plate rolling, the deformation capabilities which stored in AB section of steel plate (see Fig 1a and Fig 2) is 2 M θ, the costed ...

rolling mill speed calculation formula - ball mill,roller ... steel rolling mill speed calculation formula ... Online roll pass design software for rolling mills and . front of 13,000 hp variable speed motor on the hot mill.

torque required for start-up and operation. ... METAL ROLLING MILLS M plate tilters S ingot handling machinery M winding machines ... Calculate the drive torque. T AN. ACCORDING TO TORQUE 2. Base the coupling rated torque T KN on the drive torque T AN …

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.

clearly and precisely defined. Of course, there are rules to calculate the maximum stress in rolls caused by design limits for maximum separation force, torque, Hertzian pressure etc, but these criteria are valid only under so called "normal rolling conditions" and even these change continuously with progressive wear in the contact zone.

excell sheet calculation torque speed power for rolling mill. high performance hot rolling mills high . x pact for hot rolling mills pools our special process . emergency power …

Example- Rolling mill for changing the thickness of the material, Roller Bearings, cam-roller followers, etc How Hertzian Stress (Contact Stress) are generated Consider a ball rolling on the straight line (or cylinder rolling on a flat surface) against a flat surface and under a contact load.

Results of calculations and experimental studies of rolling torque in rolling mill 5000. Figures - available via license: Creative Commons Attribution 3.0 Unported Content may be subject to copyright.

In a rolling mill application there is significant energy involved in the reversing direction. Much of this energy will need to be dissipated into a breaking resistor, or regenerated to line. Failing to account for this will result in a drive trip at the end of travel, possibly resulting in the hot bloom running off the end of your rolling mill ...

2.1 Experimental set up. A Hille-100 rolling mill with rolls of 225 mm diameter and 254 mm length, driven by a variable speed DC motor of 75 horse power, was used. The maximum rolling force, torque and speed are 1500kN, 13kN-m and 70 rpm respectively. The sensor roll …

In the re-rolling mills, normally the 3-phase electric induction motor of high horse power is used due to the fact that the flywheel requires high torque to be driven initially. Once the flywheel stores sufficient torque which is required at the start up, the flywheel then requires less torque than what is required initially.

Development of detailed groove drawings, roll barrel layouts, roll stress calculations, rolling power, torque and separating force predictions, and roller set-up sheets. Design review and training sessions with mill personnel; Sections start-up preparation, taking into account the specific mill conditions and operational practices. Read More

Dynamic characteristic analysis of a two-stand reversible cold rolling mill in the startup process was carried out. The delay algorithm of the interstand thickness was proposed. A new method combined with the accelerated secant and the tangent methods was established to solve the simultaneous equations. The thickness and interstand tension transition processes with different static tension ...

From an approximate theory, equations are derived for roll force and torque with and without front and back tensions applied to the strip. Where tensions are applied the calculations for each pass take about an hour; without tensions, and with the use of curves given in …

parameters. A large-deformation constitutive model applicable to the calculation of roll force and torque in heavy-reduction rolling was presented by Byon, Kim, and Lee (2004). 3-D FE analysis coupled with the proposed constitutive models has been carried out to calculate work-piece deformation and the rolling force in their investigation. An

FIELD: technological processes. SUBSTANCE: invention is related to rolling-mill production. Method includes generation of setting for rotation speed of working rolls electric drives, comparison of torques for upper and lower rolls, production of torque mismatch, generation of correction for limited change of rollers rotation speed, if permissible difference of torques is exceeded.

Big Torque & Stable Running at Low Frequency under Vector Control With precise speed identification and rotor magnetic flux orientation, the torque responds quickly and stable operation in the case of 0.25Hz load mutation. Startup torque:Vector control 2 without speed feedback: 0.25Hz; 180% rated torque

• Flange with Hirth coupling to transmit maximum torque • Length compensation with SAE profile (straight flank profile, see page 34) • Heavy-duty rolling mill drives 2 Range Voith high-performance universal joint shafts offer the ideal combination of torque capacity, torsion and bending rigidity.

Abstract. 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 ...

Design a new product to roll on an existing mill. Creating the rolling plan, calculating the power and roll loads, and analyzing the suitability of the equipment to provide the necessary power and torque and withstand the rolling loads. Extend the size range of products already rolled on an existing mill.

Rolling Load. Computation of Roll Pass Design also involves calculation of loads. Where, P = Total rolling load P m = Mean unit pressure of metal on rolls F = Projected contact area = (B + b)/ 2 x l,. Where, В Sc b are the initial and final width of stock and L is length of arc of contact, which is computed by the formula i.e., Where, Reduction, AH = H-h,H and h are the initial and final ...

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