Step 4 Converting the result to kW or HP. Assuming the input values are in Inches and KC is in KPSI the result should be divided by 400 to get the power in HP units. Assuming the input values are in millimeters and KC is in Mpa (N/mm 2) the result should be divided by 60,000 to get the power in kW.
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In the hot strip mill slabs with height of ~220 mm, length of 5500 11000 mm and width of 650 1650 mm are reduced to thin strips with thickness 16 mm. The hot strip mill consists of, from start to finish, reheating furnaces, descaler, reversing roughing mill, coilbox, crop shear, descaler, finishing mill with six stands, runout table ...
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challenge for today's production in hot strip mills. Although camber has been treated as a problem for many years, cf. [58], and most of such studies are based on qualitative camber assessment, pilot plant trials and numerical simulation results, it has to be emphasized that still a lot of essential details are not yet fully understood.
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1. Introduction. For accurate dimensional control of a hotrolling process, the rollseparation force and the torque are the most important quantities for both forward production planning and realtime process control. Additionally, the rollseparation force and the torque during hot rolling are limited by the equipment of the rolling mill.
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In a hot strip mill, the hot rolled coils are produced from slabs through hot deformation and subsequent cooling with water on a run out table. In conventional rolling, the starting slab thickness is around 200 mm to 250 mm. On the other hand, in thin slab casting and rolling, the starting slab thickness is around 50 mm to 90 mm.
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Analysing metal working processes. G. Engberg, L. Karlsson, in Fundamentals of Metallurgy, 2005 Hot rolling. Mill data from the hot strip mill has been used to calculate the mean flow stress in each pass, assuming the material to be elastic ideally plastic. The roll force model used was a classical slab method with constant friction assumed in the roll gap.
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.. . Mis 2851 2968C 1120C fCT 0 126 1 75C 0 594C T +− = −+ + (3) by inverting that equation. shown that the original MFS Mis needs to be adjusted in order by preliminary analyses that the...
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An optimal correction algorithm for each stand in a finishing mill was developed. A mill setup calculation system that includes mathematical models of temperature and deformation resistance in rolling materials was developed. Particular emphasis has been put on the development of a method of optimizing the load distribution among the stands and on the development of accurate set up metals ...
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As an important fundamental raw material, hot rolling strips are widely used in industries, automobile, shipbuilding, and other fields. In hot rolling strip making, the control cooling process on runout table is vital for steel product pursuing excellent and stable performance [].After finishing rolling, the strip will be cooled by water from a start cooling temperature to target temperature ...
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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 method of principal component regression, which ...
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measured technological parameters in accordance with the proposed technique. All necessary calculations are performed in the ibaAnalyzer environment. The presented technique was applied for 14,000 coils of various gauges rolled at a hot strip mill. Figure 1 shows histograms of the friction coefficient values distribution.
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where (R'Δh) is the contact length between strip and roll, R' is the flattened roll radius, Δh is the reduction in gauge thickness for a given rolling pass, Q P is a geometric factor calculated in different ways for each rolling model and σ mean is the mean flow Sims calculations Q P is calculated from a complex function of roll gap geometry, while Ekelund 5) calculates Q P ...
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Distribution Calculation Method for Strip. How to calculate the rolling ... Rolling Mill Horsepower Calculation mayukhportfolio co in April 29th, 2018 Rolling Mill Horsepower Calculation torque in rolling ... is the starting point of the hot rolling mill Plate Rolling Formula Mechanical engineering other May 1st, 2018 Sorry for being late ...
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Contribute to dinglei2022/en development by creating an account on GitHub.
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Milling Horsepower Calculator. Calculate the horsepower required for a milling operation based on the feed rate and depth of cut, which are used to determine the material removal rate (or metal removal rate). Also required is the unit power, which is a material property describing the amount of power required to cut that material.
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Several scholars have estimated the efficiency and progress of roll fatiguedamage prediction models. Dale et al. [] used Hertz formula to establish a calculation model for predicting the subsurface stress and fatigue life and effectively evaluated the fatigue damage of backup et al. [] calculated the influence of transient thermal stress acting on a roll during the rolling ...
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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 plasticrigid materials, these equations may be ...
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The Hot Strip Mill of Çolakoğlu Metalurji was commissioned in 2010 by SMS Siemag. The millconsists mainly of a singlestand reversing roughing mill with edger, a coil box and a 7stand finishing mill see Multiple steel grades ranging from HSLA, ultra low carbon, API to conventional steel grades within a range of
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Existing method of runout table drive control on the hot strip mill ensures the required strip tension by setting a difference between speeds of the delivered strip and roller bodies. Such difference results in a higher wear rate of roller bodies and their more frequent replacement, entailing high expenses. Thus, a currently important objective is to increase efficiency of runout table ...
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Hot Strip Mill Horsepower Calculation Formula; Load Analysis and Driven Power Calculation (4 Roll Bending ... Load Analysis and Driven Power Calculation (4 Roll Bending Machine) Plate rolling machine is a kind of universal forming equipment to roll sheet metal into cylindrical, arc and other general shapes of the workpiece. It has been widely ...
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The descaling operation on a Hot Strip Mill (HSM) uses high pressure water jets to remove the thick, hard and brittle oxide scale, in order to avoid oxide embedding into the metal which degrades ...
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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 contact pressure distribution in the roll gap is given in Figure 1, in which an AA1100 strip with mm thickness and 50 mm width is ...
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BWG Machinery, mill modernization, turnkey installation, commissioning and personnel training Carlen Controls, feedback devices such as pulse tachometers, resolvers, strip speed sensors, and linear sensors ContRolling Technology International, level2 process control for hot strip mills, rolling mill simulations, multistand and multipass mills
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Finishing mill strip gage setup and control by interval type1 nonsin... Go to citation Crossref Google Scholar. ... The Calculation of Roll Force and Torque in Hot Rolling Mills. Go to citation Crossref Google Scholar. The theory of plasticity in relation to its engineering applications.
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The finishing mills of the hot rolling line from a Chinese steel company consist of 7stands fourhigh CVC mills. In order to calculate the strip crown influencing rate (K_{i}) and the correction coefficient (m_{a,b}) of each factor, the present paper takes the F1 stand as an example, and the roll system of the fourhigh CVC mill is shown ...
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Roll force is a key parameter in the process control of hot strip rolling, and its computational accuracy directly determines thickness precision, strip shape quality and rolling stability [1], [2]. Therefore, the online calculation model of roll force with high accuracy is taken as the core for substantial studies at home and abroad [3], [4].
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The range of HSMs for the rolling of hot rolled coils has undergone significant changes in the last few decades with minimum thickness of the hot rolled strips has been decreased from mm to 2 mm to mm to mm. The strips of such thickness were earlier produced only in the cold rolling mills.
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Interactive slab camber measurement. Technique. Consider the plan view of a slab shown in Fig. 2. The centreline can be represented by a continuous function zCL = f ( x ), where x is the distance along the length of the slab. The slab's curvature is therefore approximated by f′′ ( x ), provided f′ ( x) is small.
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The temperature field of strip steel is modeled with a 3D finite element analysis (FEA) structure, simultaneously considering the distribution of the work roll temperature. Then the distribution ...
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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. Loopers are placed between finishing mill stands not only to control the mass flow of the two stands but also to generate a constant specific ...
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Concept of online control system of hot strip mills. 117 118 ACCELERATED COOLING OF ROLLED STEEL Calculation of metallurgical changes by the process computer will be executed in the real time or before the part of the strip in consideration enters into the succeeding step of processing.
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To ensure product uniformity, hot rolling mills need reliable, repeatable process control data to identify operating issues; offgauge and offtolerance product results in the downgrading or even scrapping of coils. However, when hot material exits the rolling mill, the vertical position and orientation of the strip is not sufficiently defined ...
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the strip surface temperature, heat transfer in both the roll and the strip have to be modeled together. However, in the present study, modeling of strip heat transfer was avoided by assuming strip surface temperature on the basis of plant data and literature. Water Impingement Zone The work rolls are cooled by spraying water on the roll
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A material supplier from Belgium would like to produce limestone powder for his custome...
India is rich in various mineral resources and it is an important mineral processing market
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