rolling mills - the technological controls, the drive controls, the plant control functions and the auxilia-ries. A client/server system with eight operator ... The pass scheduling and set-point calculation for all rolling phases will be initiated automatically on the basis of the latest coil, roll and adaptation data as
2 Principles and Applications of Metal Rolling (ii) Shape of the rolled product- flat, sections or hollow sections rolling. (iii) Direction of rolling- lengthwise, transverse, and skew rolling. (iv) Mode of rolling mill operation- continuous (unidirectional), and reverse rolling, where direction of rotation of rolls are reversed. When two rolls of equal diameter and …
Your №1 assistant software. OptiMill™ gives access to the main parameters, such as tension, speed, rolling force, mill power, tension reel power, mill torque and neutral coefficient, and guides your operators to make the most efficient operating decisions. For example, thanks to the calculation of the roll geometry, you can choose the best …
The method to predict roll deformation precisely and efficiently is vital for the strip shape control of a six-high rolling mill. Traditional calculation methods of roll deformation, such as the finite element method and the influence function method, have been widely used due to their accuracies. However, the required calculation time is too …
Making "digital twins" for rolling processes and mill equipment should begin with the development of mathematical models of the deformation zone. The deformation zone of two-high flat mill rolling have been studied in detail, relevant models are available in many academic papers. However, the same cannot be said about the most complex …
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 …
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 research you ...
The rolling mill produces sections with diameters from 90 mm to 200 mm. Traditional technology does not provide opportunity for rolling the sections with diameters of more than 200 mm.
This article proposes URC Technology to optimize the mill design from model software calculation, to mill window layout, and even to level-2 optimal set up.
Because of the current demands on mills to process much lighter exit gauges from increased incoming hot strip thickness, much larger reductions are necessary on individual mill stands, such high reductions at a nominal width result in a larger area of contact with corresponding higher rolling force, friction and heat generation (see Fig 1
The elastic deformation of rolling mill elements during the rolling process is important. By knowing the displacement of rolls, the optimum gap between the work rolls can be calculated. In present research, a vibration model with two degrees of freedom is proposed for a cold sheet rolling mill and the stiffness parameters of different mill …
It offers increased productivity and ease compared to the two-high rolling mill. Fig 3: Three High Rolling Mill. Four-High Rolling Mill. It incorporates two backup rollers and two working rollers arranged one over the other in the same vertical plane, with the backup rollers having a greater diameter than the working rollers. It is commonly ...
In rolling mill, the accuracy and quality of the strip exit thickness are very important factors. To realize high accuracy in the strip exit thickness, the Automatic Gauge Control (AGC) system is ...
Silicon steel cold rolling mill is required for high qualities (flatness and uniform thickness), minimizing the Eddy current loss of the silicon steel and customized products. A cold rolling process of the silicon steel consists of three phases, pre-calculation, real-time control and post-calculation like a general rolling process.
That is why it is reasonable to apply one-dimensional model, based on the known dependences of rolling pressure and mill torque calculation. Currently, several dependences are known for determining the mill torque in stands with multi-roll grooves [6,23,24,25,26]. Some of them are obtained for specific cases, others are more general.
The ARB process does not require any special equipment except for a rolling mill with enough capacity, which is another advantage of this method. Figure 2.2 shows the rolling mill that has been used for the ARB process in the author's group. The rolling machine is a conventional two-high mill with 310 mm roll diameter.Because the large reduction in 1 …
Accurate calculation and measurement of rolling force play an important part in design and operation of rolling mill. Calculation of Rolling Force Assume the contact stress in the width direction of the rolled piece is evenly distributed, and the unit pressure and unit friction imposed on the rolled piece by the roll in a differential area in ...
A wire rod rolling mill, for example, gradually reduces the cross-sectional area of a starting billet (e.g., 150 mm square, 10-12 meters long) down to a finished rod (as small as 5.0 mm in diameter, 1.93 km long) at high finishing speeds (up to 120 m/sec). ... Calculation of roll force is important because calculation of torque and power in a ...
This article proposes URC Technology to optimize the mill design from model software calculation, to mill window layout, and even to level-2 optimal set up. It is a combination of software and ...
calculation of each parameter is different for each set of different application conditions. A thorough study of these methods in different application cases will lead to the optimised …
The method to predict roll deformation precisely and efficiently is vital for the strip shape control of a six-high rolling mill. Traditional calculation methods of roll …
Automatic detection and control of rolling mills . 1. Main manifestations of automation of metal rolling machinery and equipment ... The main functions of steel rolling process control include rolling schedule setting calculation, model self-adaptation, data analysis and processing, quality control, and engineering report generation. Among them ...
The calculation of roll force is necessary to ensure that the mill is not overloaded and there is enough power available for the rolling reduction to be made. Calculation of average elongation and number of …
An on-line web portal has been developed for prediction of roll force during rolling of steel at Hot Strip Mill (HSM), Rourkela Steel Plant. The prediction of roll force is being done using ...
Principles of Hot Rolling EQUIPMENT CAPABILITY – ROLLING CONSTRAINTS • Rolling cannot occur outside of typical mill electrical and mechanical constraints: Torque Roll Force Stand Speed Stand Power Stretch Limitations of Mill Housings • Violation of Equipment Capability: Thickness too light for a given width
Depending on the equipment characteristics, it is possible to say that the rolling process presents good dimensional control and high productivity due to its continuity (Helman and Cetlin, 2005). The rolling load calculation is a critical parameter when looking for the correct rolling mill setup in steel rolling.
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 0.223, true stress is 280 Mpa. FOUR HIGH ROLLING MILL. PROBLEMS AND DEFECTS IN ROLLED PRODUCTS Porosity, Cavity, Blow Holes occurred in the ...
These "RPM values" become part of the set up chart for the combination rolls sets used on the mill line. Follow the simple outline on the sample data chart for calculating and setting the RPM's of the smaller sections. Some mill lines have digital readouts for the speeds of each section as outlined in the sample drawing below.
Radial-axial ring rolling, ... while the lower conical roll is held in a fixed position above the table plate of the radial-axial mill; the guide rolls contact the ring outer diameter to ensure the circularity of the ring, and any force imbalance and instability during the rolling process are removed by the actions of the guide rolls. Under the ...
We have made a prototype of Rolling Mill Housing of optimized layout of 1:10 scale in order to affirm our outcomes which have been given via way of means of the evaluation of Rolling Mill Housing on evaluation software …
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.
A precise prediction of the rolling force is critical to ensure the quality of the final product, especially in the cold rolling of thin strips. Based on this, a new mathematical model is developed to work out the …
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.
Rolling is the most widely used mechanical work technique. About three quarters of steel output is treated in rolling mills, and only a quarter is consumed for forging, extruding, and founding [].Recent review papers on rolling process [2, 3] continues to point out that there are new demands on modeling the rolling process that could …
rolling mill, dedicated roll cooling systems are required to fulfill the required functions. Examples are suitable roll cooling and lubricationsystems to fully utilize the advantages of HSS rolls in hot strip mills, and selective roll cooling systems as a method to control the flatness of the strip in cold rolling mills.
[5] R. B. Sims, " Calculation of roll force and torque in hot rolling mills ", Proceedings of th e Institute of Mechanical Engineers, London 169, 1954, 191
The paper deals with the models for a pass design calculation as well as a calculation of roll force and power demands …
The roll deformation model of the six-high rolling mill is one of the core models of the strip shape control theory. The influence function method (IFM) is a numerical method applied to solve the roll deformation problem. This study aims to address the problems of slow calculation speed and insufficient calculation accuracy of IFM in …