Receive rolling mill contracts, the speciflcativns of the cllstomers, m. Rolling mill industry training rolling mill industry training working to lower your maintenance costs timkens rolling mill industry training program provides personalized instruction to every program attendee. Hot rolling is also commonly used to create railroad rails, and cold rolling is often used to make beverage cans. 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. It is widely accepted within industry in general that the various techniques of risk assessment contribute greatly towards improvements in the safety of complex operations and equipment.
In a broader sense, a rolling mill is an automatic system or line of machines that performs both rolling and auxiliary operations. Job description rolling mill manager of engineering. Rollers may be plain or grooved depends upon the shape of rolled product. Risk assessment and control measures for cold rolling mill. 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. Practically the all defects in cold rolling inspected before dispatching the material to the customer at skin pass mill. Dimensional tolerances for coldrolled sheet thicknesses. The work rolls used in cold rolling mills are expected to perform under very arduous operating conditions. A rolling mill is a machine for plastic deformation of metal between rotating rolls. Risk assessment and control measures for cold rolling mill in. Pdf failures of rolls occur due to improper manufacturing and operational parameters. As per operation very old storage 20012010 weld pass supervision negligence. In cold rolling mill, due to complex nature of the operation, systems, procedures and methods always involves some amount of hazards.
The hot rolling process california steel industries. The accuracy and speed of working and roll life are all related to his design and choice of ma. Provision of stable rolling conditions minimization of operator interventions footnote a sendzimir mill is a mill with small diameter work rolls, each backed up by two rolls of larger diameter which are in turn jointly backed up by a cluster of three rolls. Outline of reversing cold rolling mill 1 outline of reversing cold rolling mill and rolling method as illustrated in figure 1, a reversing cold rolling mill is comprised mainly of a mill proper, a winding machine payoff reel, an entry winding machine entry tension reel and delivery winding machine delivery tension reel. There can be numerous types of cold rolling mill, which can produce different types of rolled product, with thicknesses as low as 0.
Tandem mills can be either of hot or cold rolling mill types. Life of rolls in a cold rolling mill in a steel plant. Pdf life of rolls in a cold rolling mill in a steel plant. The starting material is usually large pieces of metal, like semifinished casting products, such as slabs, blooms, and. The place where all the equipment for metal rolling manufacture is set up is called a rolling mill.
Each stand has vertically stacked rolls that are powered by huge motors to impart high compressive stresses into the strip. A wire rod rolling mill, for example, gradually reduces the crosssectional area of a starting billet e. Backed by our extensive experience, we devote much at our focus on process optimization for cold rolling mills. With stainless steel tubes, for example, cold pilgering can achieve ra values smaller than 0. When two rolls of equal diameter and with axis lying in same. In a metal rolling process, rolls, stands, bearings, housing, motors, and other mechanical equipment are all a necessary part of the manufacturing operation. A basic understanding of the mechanics of rolling mill rolls file. Modern rolls are now designed to withstand normal rolling operations, and. Aug 23, 2017 sms group cold rolling pickling line tandem cold mill of jsw steel ltd duration.
Operator controls mill operation of the comprehensively modernized tandem cold mill. Cold rolling speeds vary but modern mills operate at exit speeds as high as 3000 m per. Feb 25, 2016 process of rolling mills published on february 25. The rolling is done in several passes for traditional several stands and reduction that take place successive roll. Materials are manually charged and discharged and the final products are rods, strips etc. Rolls or rolling mills is a cylindrical shape of roll used in rolling process. A typical rolling mill consists of a pair of rolls driven by an. Outline of reversing cold rolling mill and rolling method as illustrated in figure 1, a reversing cold rolling mill is structured mainly of a mill proper, a winding machine payoff ree l, an entry winding machine tension reel and a deliverywinding machine tension reel. The homogeneous thickness and high surface quality is maintained at 6 hi reversing mill with the help of afc and agc systems. This handbook deliberated on the fundamental of mechanical working and its theory in a very simpler way. Longstanding experience as a leading supplier of cold rolling mills as a lifecycle partner for cold rolling mills, primetals technologies offers complete solutions and support packages for cold rolling mills that extend from the initial investment idea, to mill planning, layout, engineering and construction, up to turnkey plant installations and fullscale plant modernizations.
Highspeed video captures roughing mill operation for analysis complex event processing cep data stream analysis e. Strip thickness control of cold rolling mill with roll. It is widely accepted within industry in general that the various techniques of risk assessment contribute greatly towards improvements in the safety of complex. Both hot rolling and cold rolling are used to create sheet metal. Hot rolling is a metalworking process that occurs above the recrystallization temperature of the material. Life of rolls in a cold rolling mill in a steel plant operation versus manufacture article pdf available in engineering failure analysis 71. This mill configuration is often used for heightstrength and stainless steel. In section 4, architecture and learning algorithm fuzzy neural networkof have been presented.
Sms group cold rolling pickling line tandem cold mill. Hot rolled coil that are cleaned at the pickling line hrp, is being processed at the cold rolling mill total 700,000 tons annual capacity to reduce the thickness to desired values. Cold mills, in a wide range of types and sizes are available. They learn how to use the proper equipment and practices to help reduce downtime and lower their operations overall maintenance costs. It is a modern rolling mills and the rolling is done by one pass. Applications include crumbling pellets, cracking corn, dry rolling and steam flaking grain, and grinding corn, wheat, or milo for mash and pelleted feeds.
Rolling mills often vary in the type, number, and position of rolls. Prematurely failed spalled roll samples collected from a. In section 3, a mathematical model has been driven for singlestand cold rolling mill. Rolling mill process pdf rolling processes which can also be divided in to hot and cold rolling process. Sms group cold rolling pickling line tandem cold mill of jsw steel ltd duration. Quality improvement in finished cold rolled sheet by reducing the defect ranjan prakash, baidya nath roy. The housing and set of rollers mounted on the machine is known as stand. This allows to produce cold singlestand reversing mill 4high, 6high, s6high 150,000 450,000 up to 1,500 discontinuous. This furnace is mainly used for heating up scrap, small ingots and billets weighing 2 to 20 kg for rerolling. Operation of rolling mills rolls rolls are the tools of the rolling trade and the way they are used to execute their duty of deforming steel is in many cases largely determined by the roll pass designer. This is the starting point of the hot rolling mill practice. Pdf life of rolls in a cold rolling mill in a steel. Types of rolling 12 some of the steel products made in a rolling mill. Life of rolls in a cold rolling mill in a steel plantoperation versus manufacture.
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. Life of rolls in a cold rolling mill in a steel plantoperation versus manufacture article pdf available in engineering failure analysis 71. Apply to mill operator, finisher, plant operator and more. Steel rolling technology handbook 2nd revised edition.
It is widely accepted within industry in general that the various techniques of risk assessment contribute greatly towards improvements in the safety of. Cold mill rolls should withstand mechanical and thermal shock, must have excellent wear resistance and very little plastic. With the advent of faster mills and the increase in load, the quality of rolls needs continuous improvement. Cuttingedge coldrolling mills primetals technologies. Stresses from hertzian pressure in 4high cold mill back up rolls were measured. With the publication of this book, newcomers to the field of steel rolling have a complete introductionto the cold rolling process, including the history of cold rolling, the equipment currentlyin use, the behavior of the rolling lubricant, the thermal and metallurgical aspects of the subject, mathematical models relating to rolling force and power requirements, strip shape. Cold rolling improves the surface finish and holds tighter tolerances. In section 5, thickness control with roll eccentricity compensation has been proposed.
Depending on the extent to which the cold work has been performed, cold rolled sheet can be produced in conditions such as skinrolled, quarter hard, half hard and full hard. 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. Pdf life of rolls in a cold rolling mill in a steel plantoperation. Longstanding experience as a leading supplier of coldrolling mills as a lifecycle partner for coldrolling mills, primetals technologies offers complete solutions and support packages for coldrolling mills that extend from the initial investment idea, to mill planning, layout, engineering and construction, up to turnkey plant installations and fullscale plant. 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. Rating is available when the video has been rented. Rolling of metal auxiliary operations used in connection. The feed increment on the input side is an indication of the overall efficiency of the cold pilger mill operation. Introducing cold pilger mill technology the fabricator. Furnace is lined with several layers of refractory bricks.
Shape, size, surface and safety during their inspection. Cold rollingis a rolling operation carried out at room temperature. Reheating furnace x cold stocks are heated to make them soft and thus suitable for rolling. Operation of rolling mills schweitzer rolling technology. Rolling is a process of reduction of the crosssectional. Roller mill maintenance roller mills are used around the feed mill to perform a variety of tasks. Perhaps your company is expanding their operations and a rolling mill of this type is the perfect fit for you, whether it is steel guard rails, automobile parts, either new or aftermarket, incorporating a rolling mill into your operation will set you apart from other supply houses. Cold rolling is accomplished by processing steel strip through a series of tandem rolling mill stands. The selfadaptive control functions have also been implemented in a new mitsubishi 12high cold rolling mill at avestasheffield, described in section 2.
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. Sms group cold rolling pickling line tandem cold mill of. Cold rolling can also reduce the grain size of the metal resulting in hallpetch hardening. Nov 09, 2016 4 rolling mills classified as number of arrangements of rolls 1. Modern rolling mills, and specially cold tandem mills with high productivity, are equipped with a number of transducers participating in automatic control systems. Expanding markets for coldrolled stainless steel products now have more severe. Alert when sinter size exceed 5% deviation in 10 minute timeframe microsoft streaminsight, sqlstream open source. Cold rolling is commonly conducted after hot rolling when good surface quality and low thickness tolerance are needed.
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