Skf can provide a portfolio of different calculation methods to optimize bearing selection for any kind of application. 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. When two rolls of equal diameter and with axis lying in same. Radial load on shaft, n kgf if directions of radial load differ, the vector sum of each respective load must be determined. The finishing mill usually has five to seven finishing roll stands, which reduce the thickness of the transfer bar down to the gauge required.
The determination of energypower parameters of hot plate mill. The calculation of roll torque and roll separating force. Friction plays a critical role in enabling rolling. Calculated load torque of the roughing mill stands during milling of different types of. Consider rolling of a flat plate in a 2high rolling mill.
P driven power m kw t driven force moment kn m n 2 lower roller rotation speed r min1, n 2 2vd 2 v is rolling speed. Pictures of the insides of an ag mill and a sag mill which have been crash stopped are shown in figures 5 and 6 respectively. Tools of a metallurgist comments off on ball mill power calculations related posts wills mineral processing technology. The torque is equal to the product of total rolling load and the effective. Rolling is a metal forming process, in which stock of material is passed between one or more pairs of roller to reduce and maintain the uniform thickness. End milling cutters may have straight or spiral flutes. Roll separating force is the main goal in calculations in nmm. Improvement of accuracy for gauge and elongation control. Machining time, t c min machining length l m divided by the table feed v f. The calculations of load, torque and power is done based on sims formula from billetbloom to finishing dimension as a function of geometry, steel grade, temperature and tension. If the mill has cone ends the model automatically calculates the volume of the.
The rolls are equipped with bearings and mounted in a stand with a screwdown mechanism. A nice and pretty sexy online ball mill power draw calculator was put live by one of the great. Dynamic estimation of electrical demand in hot rolling mills. The calculated value p q of the driving power can be used as the basis for selecting the main motor power. In section 5, thickness control with roll eccentricity compensation has been proposed. This is the simplest type of rolling mill setup, in which two rollers are. In section 4, architecture and learning algorithm fuzzy neural networkof have been presented. Gear couplinggear coupling mechanical power transmission.
Omc power model is omcsthe inhouse software for specific grinding energy powerbased circuit calculations. This furnace is mainly used for heating up scrap, small ingots and billets weighing 2 to 20 kg for rerolling. Calculation of rolling work and drive power from energy and power consumption diagrams 4. Accurate measurements of the ball filling can only be made after the mill is ground out. Power in rolling power is applied to the rolling mill by applying torque to the rolls and by using roll strip tension. Dec 12, 2016 the basic parameters used in ball mill design power calculations, rod mill or any tumbling mill sizing are. The desired throughput of the mill is multiplied by the specific energy to. Rolling process animation rolling mill machine concept. Rolling is the process of reducing the thickness or changing the cross section. A pass schedule for each product is generated according to roll dimensions and mill limits of force, power, and speed, together with setup rules including the reduction rule, the tension rule, the. A mechanism, commonly called a roller table, directs the work piece to the rolls, and another roller table for handling the pieces emerging out of the roll. Thorough attention is given to the calculation of strip speeds, roll forces and power requirements in the.
Overall power requirement by rowe for fourhigh mill, are the. Influence of load and lubricant viscosity on adjusted reference speed. The result of a single calculation or multiple calculations can be selected in the report. Pdf mill design, which follows engineering rules, design concepts, and past design experiences, provides a fundamental blueprint of a mill. The total rolling load is distributed over the arc of contact. The smaller end milling cutters have shanks for chuck mounting or direct spindle mounting. Strip thickness control of cold rolling mill with roll. Additional power is required to keep the mill rotating. The power of the main motor can be obtained from the value of p. Pdf method of load calculation of electrical drives of rolling mills. Hence rolling cannot be done with stock present in both roughing and finishing mills. Influence of additional friction and deformation when rolling in box passes 109 4. Method of load calculation of electrical drives of rolling mills during heavy plate manufacturing. Required energy calculation by hot rolling of tubes and of.
The rolling simulation program for calculating the empty gap unloaded stand. Rolling is the process of reducing the thickness or changing the cross section of a long workpiece by compressive forces applied through a set of rolls, as shown in figure 51. Automated procedure for roll pass design article pdf available in journal of materials engineering and performance 183. The calculation of energypower parameters on each pass of plate rolling on mill 2000 and 5000. Later the principle was applied to conveyor chain giving the same advantages of precision, heattreated components to resist wear, high strength to weight ratio and high mechanical efficiency. Cached torque in rolling mills calculation formula with example. Bearing calculation when selecting an axlebox bearing or unit, skf should be contacted for assistance with necessary calculations.
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. From 1980 to date, newer generation ii hot strip mills were built almost exclusively as semicontinuous mills, essentially eliminating the previous classical and costly continuous roughing mill configuration the 1727mm dofasco hot strip mill, built in 1982, is unique in that it. Caesar is a famous mining equipment manufacturer wellknown both at home and abroad, major in producing stone crushing equipment, mineral separation equipment, limestone grinding equipment, etc. Oct 18, 2017 cluster rolling mill tandem rolling mill let us discuss all the rolling mills one by one. A wire rod rolling mill, for example, gradually reduces the crosssectional area of a starting billet e. Basic calculation principles are mentioned in this chapter, to give an overview of. Pdf on the optimization procedure of rolling mill design. Figure 52 illustrates the sequence of steps in a steel rolling mill to show the variety of products made. Spiral flute end milling cutters are classified as lefthand or righthand cutters depending on the. The basic parameters used in ball mill design power calculations, rod mill or any tumbling mill sizing are.
Power in rolling power is applied to the rolling mill by applying. Determine the required minimum coupling rating as shown below. This paper presents a completely new approach to the mechanics of the sendzimir hot planetary rolling mill. Hp horsepower is the actual or transmitted power required by the application if unknown, use the motor or turbine nameplate rating and rpm is the actual speed the coupling is rotating determine the appropriate service factor from tables 3 on n3. Motivated by the information above, the present paper proposes an analytical solution to the total power functional for broadside rolling.
Rolling speeds at the finishing mill will be higher than at the roughing mill. However, the accurate roll torque and roll separating force for broadside rolling in a roughing sequence are the prerequisite for the automatic control of the rolling mill. Methodology for calculation of rolling load and forces acting on herringbone gear using hot rolling theory. Torque in rolling mills calculation formula with example. 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. The technique is simple and it relies on the design to specify a feed and product size plus a hardness index to produce a specific energy value kwht. Calculations of rolling power needed and loads on mechanical equipment. Mill capacity th mill drive power output torque gearbox mill capacity fig. A comparison of roberts formulation with the experimental method rajinder singh me deptt.
Jun 18, 2014 calculations of rolling power needed and loads on mechanical equipment. Pdf methodology for calculation of rolling load and. Calculation of rolling load and torque in the hot planetary. Influence of additional friction and deformation when rolling in breaking down passes 157 4. In section 3, a mathematical model has been driven for singlestand cold rolling mill. Effective calculations are shown as methodology examples for the case of stretch reducing of a. Transmission of the power from the main motor to the grinding table 2. This is essentially equivalent to calculating the effective mill transfer function and such calculations are performed routinely by industrial systems ply ltd to. The energy lost in the form of electrical losses in the motor etc. A material constant which is a factor used for power calculations, expressed in nmm2. 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.
Excell sheet calculation torque speed power for rolling mill prompt. The prediction of applied force and torque during flat hot rolling. Load analysis and driven power calculation 4 roll bending. Material flow in the planetary nill is described and a brief comparison made with flml in classical rolling practise. Where gross power is the power input to the motor, noload power is the power input to the motor when the mill is empty, chargemotion power is the power associated with the movement of the charge, and k x chargemotion power is the total power input to the charge. Vertical mill calculations symbols power consumption grinding pressure mill internals nozzle ring dam ring heat balances, example layout alternatives there are two basic layouts of the vrm system. Which calculations similar to those used in calculating change gear ratio for. In this case the mill is operated with the feed turned off until all of the ore has exited the mill. Pdf methodology for calculation of rolling load and forces. Calculation of the power draw of dry multicompartment ball mills 223 where gross power is the power input to the motor, noload power is the power input to the motor when the mill is empty, chargemotion power is the power associated with the movement of the charge, and k x chargemotion power is the.
Load analysis and driven power calculation symmetrical 3. The end milling cutter, also called an end mill, has teeth on the end as well as the periphery. A typical rolling mill consists of a pair of rolls driven by an electric motor transmitting a torque through a gear and pair of cardans. Lenard, in primer on flat rolling second edition, 2014. Pdf during manufacturing of heavy strips and plates from difficulttoform steel grades on sheet and widestrip rolling mills there is a problem of. The calculation of temperature is a function of power, dimension and heat transfer co efficient. Excell sheet calculation torque speed power for rolling mill. However, the total rolling load can be assumed to be concentrated at point along the arc of contact ata distance a from the line of centers of the rolls. A mathematical model has been used to calculate the roll force and torque.
P klq rp 2 1 1 1 1 1 tan ln ln1 2 1 4 2 1 np p exit exit exit. In order to evaluate the validity and accuracy of the suggested. Machine tool oriented values, which assist in calculating the net power to ensure that the machine can handle the cutter and operation. The power supplied to the mill is used primarily to lift the load medium and charge. The hot plate mills are destined to produce hotrolled plates. The layout of a rolling mill varies, from a simple single stand mill to several stands positioned either side by side or in a line. Hot rolling mill power calculation program free pdf file. Used in many calculations because of its simplicity. A machine used for rolling metal is called rolling mill. Method of load calculation of electrical drives of rolling mills during. The following calculations are available in the skf bearing calculator.
The calculation of roll torque and roll separating force for. Similar steps occur in other basic metal industries. Index terms electrical demand, finishing mill, hot rolling mill, power. Click on the download icon to download the report in the. Renold conveyor chain is made up of a series of inner and outer links. Rolling process animation rolling mill machine concept by.