Pdf roll pass design for hot flat rolling of plain carbon steel tariq. The necessary compression force is applied by hydraulic rams, or in many older mills by a screw arrangement driven by an electric motor 6. 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. Flying shears are used for shearing of reinforcement bars on the fly by synchronizing its circular speed with the linear speed of the incoming rebars on given axis.
Thorough account of the hot rolling process and facilities as well as followup treatments given to hot rolled products. The design of a leading oval groove for rolling a wire rod is presented as an example. Rolling mill process rmt tools rmt tools hot rolling. Lotey heavy machines manufactures complete range of guiding equipments like entry guide boxes, twist pipes and slitting boxes slit guide box which are used in hot steel rolling mill plants. The rolling mill will prove to be a musthave tool in any shopand choosing the right mill for your needs is essential. Spread when the steel is compressed in the rolls it will obviously.
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. Hot rolling mill pass design pdf roll pass design software for roll pass designers, roll pass engineers, used in rolling mills and. International reach with 100% involvement and local level attention. In flat rolling the final shape of the product is either.
Stresses from hertzian pressure in 4high cold mill back up rolls were measured years ago, the results were never published, but of high interest also, maybe later. We manufacture these products using finest quality raw materials sourced from leading vendors around the globe. Services complete mill layout design supervision and commissioning roll pass design bar mills, section mills, universal mills slit rolling design and equipments roll grooving and notching roll cooling design and improvement roll shop design and cost calculation. Main content use access key 5 to view full text ocr mode. A conventional rolling mill is equipped with bending systems that can control this. Look for editions of this book at your library, or elsewhere. Having experience of more than 30 years, we specialize in roll pass design for all types of steel sections from small bar mills to structural mills. Hot rolling practice an attempted recollection saral dutta. Objective of roll pass design steel sections are generally rolled in several passes, whose num ber is determined by the ratio of initial input material and final cros s section of finished product. Thumb rules in rolls pass design pass groove angle bottom angle relief. In the development of shape rolling systems, roll pass design rpd plays an essential role on the quality control of products, service life of rolls, productivity of rolling systems, as well as. Such a roll pass design, producing an optimised profile of the intermediate solid at an initial stage, has a marked beneficial effect on the durability of all rolls downstream in the production line.
These types of mills are commonly used to hot roll wide plates, most cold rolling applications, and to roll foils. Guiding equipment, steel rolling mill guiding equipment. Thorough account of the hotrolling process and facilities as well as followup treatments given to hotrolled products. Rolling process animation rolling mill machine concept by. Pdf a new method for roll pass design optimisation sead. Criteria for improving a hot steel rolling process are process efficiency, resource consumption. Oct 18, 2017 in this type of rolling mills, three rollers are used one over the other in a vertical line. A cluster mill has more than 4 rolls, usually in three tiers. Hot rolling is among the most widely used manufacturing techniques. Rolling mill pass design crusher mills, cone crusher, jaw. 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. Exit end of 2hi rolling mill for isothermal shaperolling trials.
Wicon the versatile tool for long products rolling simulation, optimization, process design and product quality. Nov 30, 2016 hot rolling is among the most widely used manufacturing techniques. Specialize in hot rolling mills for rails, sheet piles and beams. There are many types of reheating furnaces with various designs. Basics of rolling a rolling mill consist of several, at least two rolls cylindrical or nea. What you can expect from our hot rolling mills are high productivity and costeffectiveness. Dipartimento di tecnologia e sistemi di produzione, politecnico di torinoltaly received on january 8,1990 in the paper a general computer approach strategy concerning the roll pass design for round bars is presented. Computeraided analysis and design of the shape rolling process for. The first in the ussr rolls for hotrolling mills were produced from ingots weighing up to 40 tons at uralmashplant in 1934. In the conventional hot strip mills the minimum strip thickness rolled was 1,5 2 mm. Sciforum preprints scilit sciprofiles mdpi books encyclopedia mdpi blog. The hot rolling process california steel industries, inc.
The 2hi hot rolling mills are used for materials like aluminum, copper, brass and other softer metals whereas the 5hi hot rolling mills are used for harder metals like stainless steel, alloy steel etc. In this type of rolling mills, three rollers are used one over the other in a vertical line. The plant began producing large ingots, weighing 60 tons and more, in 19351936, which allowed to manufacture large backup rolls for rolling mills. A fourhigh mill has four rolls, two small and two large.
In this region the metal is plastically deformed, and there is slipping between the strip and the work roll surface. Pdf numerical simulation in roll pass design for bar rolling. The hot rolling process the primary function of the hot strip mill is to reheat semifinished steel slabs of steel nearly to their melting point, then roll them thinner and longer through 12 successive rolling mill stands driven by motors totaling 77,000 hp, and finally coiling up the lengthened steel sheet for transport to the next process. May 18, 2015 roll pass design in continuous bar mills 1. The first in the ussr rolls for hot rolling mills were produced from ingots weighing up to 40 tons at uralmashplant in 1934. What are limitations in bar and rod roll pass design. Hot rolling mills includes multiple finishing mills to reduce the thickness of the transfer bar down to the gauge according to customers requirement. Turnkey solutions for complete hot rolling mills design process of rolling mills. The hot rolling mills are normally of 2hi or 5hi configuration depending on the type of product being rolled. Simulation of hot rolling roughing mill first pass by finite element method. Pdf a new method for roll pass design optimisation. Schweitzer rolling technology offers the highest quality roll pass design to ferrous and nonferrous hot rolling mills. Steel industry, roll pass design, rolling process, coefficient of draught. Designing and commissioning the tools for hot metal forming business.
However, rolling mills are major resource consumers. Services complete mill layout design supervision and commissioning roll pass design bar mills, section mills, universal mills slit rolling design and equipments roll grooving and notching roll cooling design. Pdf on the optimization procedure of rolling mill design a. In todays post on the studio, rio grande tech team member and creator of wickedcool jewelry designs ashli brooke taylor shares some great information about how to go about choosing the mill thats right for you. The roll deflection during hot rolling can result in uneven thickness distribution. Numerical simulation in roll pass design for bar rolling. The cross section area is reduced in each pass and form and size of. Therefore, it is important to optimise rpd including the selection of roll. This approach is essential for pass schedule design and process parameter. Hot saw and grinding cutters bar quenching systems. This stateoftheart volume examines steel rolling technology in a systematic and comprehensive mannerproviding an excellent synthesis of current information from three different branches of sciencephysics, metallurgy, and engineering. Rolling mill work rolls impart the rolled strips with their finished surface quality. The rolling passes cause a significant increase in the metals resistance to. Hot bar entering the roll pass hot bar after rolling bottom roll top roll exit side water header design.
One of the goals of roll pass design is to properly design a series of reductions in such a way as to mitigate the relative differences in shape change between areas, in order to avoid material defects. This book discusses as well the different types of rolls for various rolling mills, including blooming, plate, sheet, sheet bar, small section, heavy product, skin passing, and cold rolling mills. Roll pass design is an essential part of long product rolling process, since the long products are rolled between the shaped rolls in the long product rolling mills. Companion volume to cold rolling of steel by william roberts circa 1978 and number two of the series. Butech bliss has built mills for just about every application over its year span. The course will provide the participants with the theoretical knowledge, practical skills, and confidence to deal with daytoday roll pass, quality, and production issues. In shape rolling manufacture, a work piece will often experience different amounts of reduction in different areas of its cross section. Help with reading books report a bad link suggest a new listing home search new listings authors titles subjects serials. The normal and average center distance from the center of one roll to the center of other determine the size of mill. This stateoftheart volume examines steelrolling technology in a systematic and comprehensive mannerproviding an excellent synthesis of current information from three different branches of sciencephysics, metallurgy, and engineering.
Production of seamless pipe and tube by hot rolling using rotary piercing mill, plug mill, continuous mill, pilger mill and finishing mills, such as reeling, sizing. Depending on your final products and production volume, we develop custom solutions wherever you are in the world. Jun 18, 2014 roll pass design is an essential part of long product rolling process, since the long products are rolled between the shaped rolls in the long product rolling mills. Hot rolling with rough rolls serrations on rolls 27 to 34. 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. The complete technology book on hot rolling of steel. During this time we will cover the basics of metal deformation, the rolling of steel, and roll pass design concepts.
Prediction of plate crown during aluminum hot flat rolling by finite. An ultimate goal in engineering design is to apply scientific knowledge in order to enable the sustainable manufacture of a product. Roll pass design in continuous bar mills slideshare. Find demag, mesta, blawknox, and loewy for sale on machinio. A selected list of books and publications, dealing with the theory of plasticity.
There are two types of rolling process flat and profile rolling. When the steel is compressed in the rolls it will obviously. In thinslab continuouscast rolling mills the strip rolled thickness is below 1 mm and the strip caster aims to cast between 2 and 1 mm. Roll pass design methods includes determining the dimensions, shape, number and type of arrangement of rolling mill passes. Strip thickness control of cold rolling mill with roll. Computer based fem simulations incorporating deformation models can be used to develop optimum process sequences to obtain steels with sound quality, desirable microstructure and mechanical properties by controlling the hot rolling. Product range cold rolling mill, hot rolling mill, rolling. Hot rolling practice an attempted recollection insdag. Secondary scale on hot strip and the impact on wear is another issue. The roll designer will pick the number and size of stands, the reductions at each stand, size motors and drive systems, and design the grooves and roll barrel layouts to provide the most cost effective method of producing the given products. With this breadth of experience in ferrous and nonferrous rolling mills, we stand ready to perform services for. Mild steel plates of various aspect ratio woho widththickness. 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.
Jan 08, 2014 the roll designer will pick the number and size of stands, the reductions at each stand, size motors and drive systems, and design the grooves and roll barrel layouts to provide the most cost effective method of producing the given products. Effect of pass schedule and groove design on the metal. Rollers may be plain or grooved depends upon the shape of rolled product. Roll pass design rpd is a principal factor that determines process efficiency, product quality and resource consumption. Innovations in the hot rolling process are listed and hot strip mill upgrades are outlined. In the past it used to take weeks to produce coiled strip from iron ore. We can pass the ingot between first two rollers and then last two rollers. Our plants give you what you need to respond flexibly to market demands. These backup rolls are larger and contact the back side of the smaller rolls. Pdf a procedure to optimize the rolling mill design will be discussed in this article. Another solution for reducing the number of passes in the rolling mills is the employment of automated systems for roll pass design as that proposed by lambiase.