Rolling mill pass design calculation

Several advances have been done in the recent past with the development of more robust design approaches, i. Development of detailed groove drawings, roll barrel layouts, roll stress calculations, rolling power, torque and separating force predictions, and roller setup sheets. The roll pass design of a finishing round sequence follows the same general principles as of a roughing sequence. The work thickness is to be reduced to 22 mm in one pass at a roll speed of 50 revmin. During this process, all process information is gathered and recorded throughout the mill and production and performance metrics are made available in real time. Thumb rules in rolls pass design fittings from oval to round must be 0.

If the thickness variation of the hotrolled aluminum strip can be reduced, it will be possible to increase the production speed of the cold strip mill. Qmos rolling mill production module manages the flow of information from the time billets and blooms are charged into the reheat furnace up to the end of the cooling bed. The course covers metal deformation in the roll gap, force, torque and power requirements, and temperature and microstructure evolution during rolling and controlled cooling. Pdf methodology for calculation of rolling load and. This lecture describes the fundamentals of rolling process including working principle, calculation of various rolling parameters rolling force, power consumption, torque etc. During the technology design the rolling separating force is a parameter among many others, which should. The weight of rolls may vary from a few kilograms up to 250 tonnes. Pdf numerical simulation in roll pass design for bar rolling. The work material has a flow curve defined by k 275 mpa and n 0. The rolling mill facilities were designed to meet the production requirement of table 1. The usage of a new form of the roll grooves will allow achieving higher durability of the rolls. Rolls are tools used in rolling mills to reduce the cross section of metal stock. Pass design and groove details this calculation gives the. A determination of the total roll separating force during.

Primary issues in various rolling processes in the flat rolling, the roll deformation, metallurgical application and the utilization of the equipment capacity force limit, torque limit, etc. Numerical simulation in roll pass design for bar rolling article pdf available in metalurgija sisak then zagreb 541. Rolling mill pass design crusher mills, cone crusher. Roll pass design the perfect fusion of art and technology that ensures flexibility, stability and quality in your rolling mill. The computeraided design cad files and all associated content posted to this website are created, uploaded, managed and owned by third party users. A model has been used to calculate pass design of a finishing train of a continuous billet mill producing 60 mm square billet from 120 mm square bloom.

Wicon is a software that can be used in all levels of the company for this type of analyzes. Rolling the important parameters for rolling in the roughing, intermediate, and finishing group of stands in the rolling mill are temperature, percentage of reduction in. Spread when the steel is compressed in the rolls it will obviously move in the direction of least resistance, so usually there is not only longitudinal flow but also some lateral flow. Mill design, which follows engineering rules, design concepts, and past design experiences, provides a fundamental blueprint of a mill. Roll pass designs projects typically follow the following timeline. Various rolling mill configurations are available to deal with the variety of. Under rolling conditions the contact area between roll and stock suffers wear, the other parts of a roll body and necks have to be considered as normal parts of designed components under high load. Modern long product rolling mills are built as continuous or semi. Roll pass design for hot flat rolling of plain carbon steel. Rolling mills are facilities that carry out a series of processes including rolling the billets, blooms, slab and beam blanks extracted from the reheating furnace into the prescribed size and correcting any bending, cutting them into given lengths, then piling or bundling as needed for shipment. We can undertake technical evaluation of a rolling mill, its roll pass design and practices and can suggest means to improve rolling practices, roll pass design and mill management, to improve its marketing competitiveness by enhancing production, mill utilisation and yield of the rolled products, we can provide consultancy in following areas. Angle of bite in degrees with reference to speed of mill. The prediction of the load and torque with different groove designs plays an important role in order to improve the draft during rolling. Effect of pass schedule and groove design on the metal.

Tension settings, e speed settings, r default settings. Roll pass design involves one of the highest technologies in the rolling mill operation. The analysis of two roll pass design options of ten roughing stands atojsc mmk 370 rolling mill has been performed. The course will provide the participants with the theoretical knowledge, practical skills, and confidence to deal with daytoday roll pass, quality, and production issues. Rolling process steel rolling consists of passing the material, usually termed t he stock. This course is designed to improve mill related engineers the basic skills on rolling mill parameters calculation for mill design, development and operation.

Computeraided roll pass design for continuous billet mill. Roll pass design methods includes determining the dimensions, shape, number and type of arrangement of rolling mill passes. Rolling mill operators commonly use analytical calculation programs to compute pass schedules or pass sequences. The design of roll pass is extremely complex and lot of experience is required for the purpose. Its goal is to achieve uniform deformation throughout the cross section in each reduction. Simulating a multistage rolling mill process, part 1. For ovals width to height ratio must be less than 3. Roll pass designing pass designing, sizing, a set ofmethods for determining the dimensions, shape, number, andtype of arrangement of rolling mill passes. Roll pass design in continuous bar mills slideshare. United nations development programme, india partners with ministry of steel to upscale energy efficient interventions in the steel rerolling mills. A determination of the total roll separating force during rolling of bimetal rods in the grooves the proper design of the rolling process of the bimetal rods in the grooves requires taking into account many constraints affecting the process. Pdf roll pass design for hot flat rolling of plain. Suitable course for mechanical engineers, steel mill supervisor, technicians and those are interested about physics, math, metallurgy.

These claims set new demands on the acceptable rolling forces and torques which, together with the roll pass design, have a signi. Each cad and any associated text, image or data is in no way sponsored by or affiliated with any company, organization or realworld item, product, or good it may purport to portray. Methodology for calculation of rolling load and forces acting on herringbone gear using hot rolling theory. Hence there is a need for compact rolling mills with a low cost which can roll very small thickness plates. The height of the leading oval is defined by an iterative calculation. Angle of bite in degrees with reference to speed of mill 0 0. Torque in rolling mills calculation formula with example. This is the first in a threepart webinar series that will highlight the use of mathworks products for modeling and control of a multistage rolling mill process. Basics of rolling a rolling mill consist of several, at least two rolls cylindrical or nearly cylindrical bodies which are termed as roll and which rest in bearings at their. The normal and average center distance from the center of one roll to the center of o. More uniform load distribution by the stands will reduce the possibility of main mill lines equipment. Pdf roll pass design for hot flat rolling of plain carbon steel tariq. The mill design innovation focuses on performance improvement of mechanical, electrical, hydraulic, electronic, control, and programming components. Besides normal rolling conditions a stable, theoretical assumption mills experience many different.

In a traditional rolling mill rolling is done in several passes, but in tandem mill there are several stands 2 stands and reductions take place successively. Santanu chakraborty, in treatise on process metallurgy. Roll pass designing in continuous bar mill billet size area finished size area of finished bar coefficient of elongation no. Roll pass designingalso includes the calculation of pressing forces and their distribution on the roll passes. Automated procedure for roll pass design article pdf available in journal of materials engineering and performance 183. In this webinar mathworks engineers demonstrate the benefits of using simulink as a platform for modeling and control system design for a sheetmetalrolling application. Pdf on the optimization procedure of rolling mill design. There is a multitude of different solutions in this area, but all have the common problem that they only take into account some aspects of theschedule or sequence, which are then often based on simplifications and.

Basics of rolling a rolling mill consist of several, at least two rolls cylindrical. The rolling mills complex was proposed to include a light and medium merchant mill with breakdown group of stands for rolling blooms into billets and an intermediate inline heat compensating. The roll grooves in a roller and the roll pass sequence in a. To control the lateral spread of the work it is turned through 900 after each pass before entering the next. Roll pass design also includes the calculation of pressing forces and their distribution on the roll passes. Watch how an optimum roll pass design leads to the distribution of loads across rolls, ensuring better rolling quality and reduction in specific power consumption. A tandem mill is a special type of modern rolling mill where rolling is done in one pass. Webbased roll pass design, webbased roll pass software.

When assembled in the mill complete cross section is obtained. Basics of rolling a rolling mill consist of several, at least two rolls cylindrical or nearly cylindrical bodies which are termed as roll and which rest in bearings at their ends. I have tried to give an idea that what pass designing actually is. This book is a valuable resource for rolling mill engineers. In this work a rolling mill is designed to roll a maximum width of 100mm and the maximum draft value is 0. Roll pass design solutions service provider from nehru. Only section iron is rolled between theshaped rolls. Roll pass design is a set of methods for determining the dimensions, shape, number, and type of arrangement of rolling mill passes. The final chapter explains the purpose of roll pass design to ensure the maximum output at minimum cost as well as to reduce the roll wear to a minimum. Roll pass designing article about roll pass designing by.

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. Roll pass design is a complex problem due to the large number of. On the optimization procedure of rolling mill design. Analysis of efficiency of roll pass design options for. Cold rolling mill, zoommilltm, offgauge, minimization, yield, productivity, labor saving, leader strip, spot welder, evennumbered pass 1. Lesser rolls consumption will allow saving up to 800k rubles annually. Roll pass design service and consultant teksmithe steel. Pdf automated procedure for roll pass design researchgate. A 300mmwide strip 25mm thick is fed through a rolling mill with two powered rolls each of radius 250 mm. Roll pass design also includes the calculation of pressing forces and their. Roll pass design generally means the cutting of grooves in the roll body through which steel to be rolled is made to pass sequentially to get the desired contour and size. An investigation on the roll force and torque fluctuations. Calculating jar and jar rolling mill speedthe design of rolling mills, it is necessary for a theory.

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