Calculating Mill Drive RPMs: Is Your Mill Up to Speed? By Robert A Sladky Vice President Tube Mill Engineering Many "W" style mills that have the ability to shim up the bottom driven shafts in each section to maintain metal line after tooling is reworked, and are many times also equipped with a individual motor drive in each of the three sections as illustrated below

Get PriceRoller System Structure Stability Calculation Work roller force analysis is shown in Figure 1, where is the force on work roller by backup roller, is the rolling force, is the work roll bearing reaction force by mill house, is the friction arm distance (02 mm) between work roller and backup roller, and are the front and back tension, and are ,

Get PriceThis process is vastly used in respect of any other rolling process In this process, the metal is heated above the recrystallization temperatureIn the hot working process, the metal is changing its grain structure because of the heat, now there were a new set of strain-free grains in the metal and this process needs less amount of force which correspondingly reduces the quality of the ,

Get Pricearc and friction parallel to roller surface tangent The rolling force , Calculation of rolling pressure is an , instrumented rolling mill was utilized to measure force and torque during hot ,

Get Pricefocused on analyzing the rolling load or rolling torque generated by pair cross mills [7, 8], and on the strip profile control capability of the roll crossing mill[9], and so forth Polymers have increasingly been used to replace metallic parts in a wide range of

Get Price2 Outline of Reversing Cold Rolling Mill (1) Outline of reversing cold rolling mill and rolling method As illustrated in Figure 1, a reversing cold rolling mill is comprised mainly of a mill proper, a winding machine (pay-off reel), an entry winding machine (entry tension reel) and delivery winding machine (delivery tension reel)

Get PriceThe rolling process is shown in Fig 21: 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

Get Price• Roll Force: F= LwY avg •Roll , is 300 mm, and the rolls rotate at 100 rpm Calculate the roll force and the power required For annealed copper, it has a true stress of about 80 Mpa in the unstrained condition and at a true strain of 0223, true stress is 280 Mpa FOUR HIGH ROLLING MILL PROBLEMS AND DEFECTS IN ROLLED PRODUCTS Porosity, ,

Get PriceCalculation examples of radial load distribution are described in the following section [Remark] Bearings shown in Exs 3 to 5 are affected by components of axial force when these bearings accommodate radial load, and axial load (K a) which is transferred externally, ie from gears

Get PriceMay 25, 2012· Online calculation model of rolling force for cold rolling mill based on numerical integration Abstract: Based on comprehensive consideration of elastic and plastic deformation of both strip and work roll, an online rolling force model for tandem cold rolling mill has been developed by numerical integration method in this paper

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Get PriceJun 04, 2018· During manufacturing of heavy strips and plates from difficult-to-form steel grades on sheet and wide-strip rolling mills there is a problem of exact calculation of power parameters of rolling It is pointed out that known methods do not provide required precise information at high deformation zones in a stand

Get Priceclearly 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

Get PriceRolling force is the most important technical parameter for the tandem cold mill In this paper, the precise models and calculation process for the rolling force are introduced The rolling force model is based on the Bland-Ford and Hill theory, and the roll flatten radius is calculated with the Hitchcok’s formula The deformation resistance of the strip is calculated with the model, whose ,

Get Priceintroduction 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 ,

Get Pricereversing rolling mill (shown below) with 750 mm diameter rolls made of tool steel is available for this task 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

Get PriceIn this paper the concentration is given to the calculation of rolling load and the forces acting on the gears of steel rolling machine After that power and torque required is calculated for the rolling load and the gear forces simultaneously which is further useful for designing and analysis the gear used in gearbox of hot rolling machine

Get Pricedetermination of the overall roll separating force during the rolling of bimetallic rods A subject of the paper is a development of analytical model of rolling force during rolling of bimetallic rods Re-sults of calculation by analytical model are compared with results of FEM model and experimental data

Get Price•Frictional force is needed to pull the metal into the rolls and responsible for a large portion of the rolling load •High friction results in high rolling load, a steep friction hill and great tendency for edge cracking •The friction varies from point to point along the contact arc of the roll

Get Pricethe radial forc Roller bearings have a higher load carrying capacity than ball bearings As a result, the radial forces are supported by roller bearings only, namely cylindrical roller bearings, tapered roller bearings or spherical roller bearings The material used for the bearing rings and rolling elements is through hardening rolling

Get PriceDue to the growing importance of width control in strip and plate mills, edge rolling is currently an im-portant process in hot rolling mills Research in edge rolling has been carried out, and in the present ar-ticle, models for roll force, torque, and lever arm coefficient are derived using the upper bound method

Get Pricecalculation in t he force model is based on that the backup roll , and Practical Application for Modern Crown and Shape Control Devices of Rolling Mills", Sino-American Technology & Engineering ,

Get PriceIn order to analyze the influence of technical parameters on work roll axial force of four-high continuous variable crown (CVC) mill, the deformation analyzing model with top roll system and strip was established based on influence function method Then a CVC work roll curve designing scheme was proposed and it was carried out on some cold rolling mill considering the requirement of ,

Get Priceclearly 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

Get PriceBasics of Web Tension Control Summary Presenter: Darrell Whiteside, Sales Channel Manager – Tension Control Maxcess International This presentation ,

Get PriceAug 26, 2014· Example for cold strip mill process nzsteelconz In batches of 9 coils, cold rolled steel is annealed to reduce work hardening The 6 roll configuration enables this high speed mill to produce steel of high quality with consistent shape and flatness Cold rolling mill Coils are transferred to and from the annealing furnace The combination ,

Get PriceThe roll separating forces obtained in a single-stage pass of 55% reduction and two two-stage passes of 14/39% and 20/336% reduction are given in Figure 154, measured when rolling the softer AISI 1008, deep-drawing quality steel Figures 152 and 154 are quite similar The dynamic response of the mill is also similar to the previously observed behaviour

Get PriceThe Mill Load application is specifically developed for mill design/operation engineers to calculate roll separating force, rolling torque and power, etcIn building a new mill, motor selection, mill size determination and transmission system design, etc are all based on mill load calculation

Get PriceFlat Rolling •Roll Force: F= LwY avg •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 ,

Get Priceof a procedure for calculating the power parameters of rolling in a stand with four-roll pass The solution of these challenges is given using the example of an operating ﬁve-stand wire mill The authors analysed the known analytical dependencies for calculating the rolling mill force and torque

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