work rolls in stand F0 was simulated for one week of service time in the mill. The work rolls had an initial ground crown of +0.005 inch. Fig. 7 provides an illus-tration of the effect of the roll wear for the two bar widths, i.e., 40 inches and 70 inches. Simulation results confirmed the significant impact of roll wear on the transfer bar crown.
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ABSTRACT Strip profile control in the hot rolling process plays an important role in guaranteeing high-precision profiles for silicon steel production in cold strip mills. A symmetry variable taper (SVT) work roll for the downstream finishing stands of hot strip mills is designed, which can be used for long stroke reciprocating shifting of work rolls, …
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The Process of Coiling System. Coiling area including the last finishing mill export to the end of the transport chain, the main equipment are hot run out table, the side guide, …
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Roll Design1. John G. Lenard, in Primer on Flat Rolling (Second Edition), 2014 3.5 Friction and Wear. Work rolls in hot strip mills wear due to friction between the roll surface and hot strip. (Back-up rolls wear as well, but under pressure with elastic deformation, the friction is much less, except for the high work roll roughness in the last stand of a sheet …
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Backup rolls of hot rolling mills have long service life, can withstand harsh working conditions during rolling. However, they undergo severe roll wear that affects the contact force between rolls, resulting in roll fatigue and even spalling accidents. In this study, a fatigue-damage prediction model of a backup roll considering roll wear is …
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stands of the finishing mill trains of virtually all hot strip mills 33, 34). The high-speed-steel rolls, however, tend to develop deep cracks at locations where the strip tail crashes when used ...
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Work Roll Wear in the Hot Strip Mill Accurate prediction of work roll wear is a key component of high-quality hot strip rolling. Incorrectly calculated wear has different …
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The automatic jump control (AJC) of wrapping rolls is very important for the final quality of products. The system is the first set of AJC system based on Siemens …
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The hot-strip mill with a rated capacity of 5.5 million metric tons per year will produce coils with a maximum weight of 36 metric tons, thicknesses from 1.2 to 25.4 millimeters, and widths from 900 to 1,650 millimeters. The hot-strip mill comprises one slab-sizing press, two single-stand roughing mills, a
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3.1 Design principle of variable contact back-up roll. Yang et al. [] proposed a variable contact back-up roll (VCR) shape.The VCR curve is a high-order curve (usually a 6-order curve) with designed continuous curvature change. The VCR technology used in finishing mill group has the following advantages: it can automatically adapt to different …
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The process produces sheets that can be extremely long, which are then rolled into coils. However, the hot strip steel mill is universally considered one of the harshest environments for process …
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The table roll speed varies from 1.5–15 m/s. The run-out table is equipped with laminar water-cooling facility. The cooling is provided on top and bottom side of the strip. There are 11 water banks: 10 for macro zone and 1 for micro zone. In macro zone, each bank has 2 headers and 1 micro zone has 4 headers.
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High-speed steel type cast iron rolls were developed around 1990 and have been widely used in the former stands of hot strip mills. However, in the latter stands of the hot strip mills, the use of ...
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During the hot strip tandem rolling (HSTR) process, the strip is compressed and elongated continuously, causing significant elastic deformation of rolls. At the same time, the strip temperature undergoes rapid increase and decrease, and distributes unevenly along the strip width direction. Elastic deformation of rolls and strip …
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The roll performance of the developed rolls was 1.4 times higher than that of the NiGr-E2 rolls; this is similar to the results of the evaluation used in a hot strip mill. In this study, the results showed a difference in the improvement of roll performance for hot strip mills (170%) in Fig. 12 and that for plate mills (140%) in Fig. 14. The ...
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Wrapper roll is one of the most important components in rolling coiler. And it has great relation to the quality of the final products. Based on the programming and optimization …
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Ingots can be processed with thicknesses up to 660mm (26in), at widths up to 1,778mm (70in) and at lengths up to 5,080mm (200in). Following roughing, the transfer bar passes on to the finishing mill through an Encopanel-covered section to minimise temperature loss and provide a more uniform finish-rolling temperature.
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V. Goryany, O. Myronova Modern materials for cast rolls of hot strip mills ZASTITA MATERIJALA 63 (2022) broj 3 301 forces and a low rolling speed, which leads to a
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Abstract. While it is acknowledged that roll wear is one of the most challenges to hot strip mills (HSM), very few studies which detail an exact prediction …
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160 120 top WR — cal curated ùstance from the edge Imml (a) 120 100 60 -100 -150 — caculated Ostance the edge —calculated Dstance [mm] -200
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where (h_{{text{c}}}), (h) and (h^{prime }) are the thicknesses at the center, 40 mm on the left side and 40 mm on the right side of the strip, respectively.. As is shown in Fig. 2, the simplified diagram of the studied rolling process includes six finishing mills, and all finishing mills are HCW (high crown mill with work roll shifting) that only …
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This immense power gives the hot rolling and processing facility the capability and versatility to process and roll the broadest ranges of specialty metals in the industry. The finishing mill is normally designed with six to seven 4-high mill stands, each equipped with 10 MW drives and a mill-stand load of up to 55 MN.
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HOT STRIP MILLS 4 X-Roll® hot strip mills from SMS group are all-round plants for manufacturing hot strip. You can use them to produce a wide range of products – from thin strips with a minimum final gage of 1.2 millimeters to high-strength tube steels with a thickness of 25.4 millime-ters, along with stainless steel grades. Built in is a large
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The production of hot-rolled strip occupies an important position in the modern iron and steel industry system. Strip shape, mainly including crown and flatness, is a key quality indicator in the production process of hot-rolled strip, and strip shape control is also a challenge in the production process of strip steel [1,2].Although scholars and …
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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. e.g. [5–8], and most of such studies are based on qualitative
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Hot rolling. This process stretches a slab into a strip. The slab is reheated to approximately 1250°C and rolled in hot conditions. The resultant strip steel is wound into a roll like …
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In comparison with the conventional work roll contour of K-WRS mill, the self-maintenances of roll contours for ASR reach to more than 88%, the rate of the measured strip crown less than 45μm ...
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The role of a hot strip mill process is to roll the slabs produced in a continuous casting process and produce strips of thickness 0.8–20 mm. Fig. 1 shows a typical layout of a hot strip mill. Slabs are heated up to around 1200 °C in reheating furnaces and then rolled on two reversing roughing mills which reduce the thickness of …
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In hot strip mills, initial controller set points have to be calculated before the steel bar enters the mill. Calculations rely on the good knowledge of rolling variables. Measurements are available only after the bar has entered the mill, and therefore they have to be estimated. Estimation of process variables, particularly that of temperature, is of …
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In hot rolling mills, premature failure of rolls is a major concern as it adversely affects the mill operation as well as production. Analysis of failed roll materials and actual rolling conditions in service are therefore necessary to understand the roll failure mechanism and thereby improve the service life of rolls. The hot strip mill referred here …
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sion. It help the wrapper roll operate effectively and enhance the quality of band steel. The control system has been one of the most important functions of the whole control system. …
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Abstract. This paper describes how an optimization of the rolling conditions (roll lubrication, strip chilling) and the use of new roll qualities on the 2050 mm hot strip …
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