Lubrication is one of the most important factors for improving the productivity of tandem cold rolling mills, as it is possible to increase the rolling speed of thin gauge steel strips and prevent chatter when rolling materials with high deformation resistance.In this study, a new hybrid lubrication system is proposed and its effectiveness is clarified.Web
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roll-gap lubrication for hot and cold rolling, which were developed utilizing extensive knowledge and expertise about the tribological interactions in the roll-gap. The advanced work-roll lubrication package (A-WRL) for hot rolling and ESP mills is using specially designed mixer-nozzle units to mix the water/oil emulsion very close to theWeb
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The lubricant film thickness, h 1, in sheet rolling can be seen to depend on a number of metal (material flow stress σ), mill (roll radius a, inlet strip velocity U 1, roll velocity V, back tension stress s, and the projected contact length x 1), and chemistry properties (fluid viscosity at atmospheric pressure μ o and pressure coefficient of ...Web
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In the existing lubrication in heat-rolling process device, usually adopt and on the grease supply mode, adopt the centralized oil supply mode, promptly the technological lubrication grease of all finishing mill units is only concentrated by a table oil pump provides, the size of system pressure has determined the size of total grease …Web
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Transfer bar cooling system installed at the hot strip mill of Tata Steel´s Port Talbot [2]. ... lubrication, roll cooling, inter stand and skin cooling, 2. bending, shifting, prediction of roll ...Web
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Supplier: Parent Petroleum Co. Description: larger image Conoco Rolling Oil is a high-quality, multipurpose rolling oil developed for rolling non-ferrous metals, such as aluminum, brass, copper and copper alloys. It also is recommended for use as a bearing lubricant, hydraulic oil and roll-coating. Kinematic Viscosity: 8.6 cSt.Web
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Benefits of Hot Roll Lubrication There are numerous benefits of using hot rolling lubrication in Shape Rolling Mills as given below. P P T P P Fig.2 Schematic of hot rolling lubrication system Fig.3 Specific roll force with and without lubrication 0.000 0.002 0.004 0.006 0.008 0.010 0.012 0.014 0.016 2.0-2.5 2.5-3.0 3.0-3.5 3.5-4.0 4.0-4.5 4.5 ...Web
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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 …Web
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Lubrication is crucial to make the key machinery contact components operate durably and reliably at extremely high temperatures, like the blade in the engine, the roller in the hot rolling process, etc. [1,2,3,4,5,6].For hot metal forming processes, like hot rolling, the roller and work rolls are often exposed to high load (41 GPa) and elevated …Web
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Hot Rolling. Most of the deformation takes place in the hot rolling mill, where the slabs are rolled at temperatures of about 1,250 ° C [3, 4]. The advantages of rolling in the hot forming temperature range are the lower rolling forces and the possibility to obtain hot strip products with soft microstructure that can be easily formed in ...Web
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In hot rolling the composition of the emulsion suffers from contamination by aluminum wear debris produced in the roll gap, by reaction products of the components or due to bacterial attack, and by tramp oils stemming from leakages of the hydraulic and bearing lubrication system. Water is lost due to evaporation at the mill.Web
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The hot rolling of thin strip below 2.0 mm on a CSP rolling plant with six to seven mill stands requires a roll gap lubrication and roll gap cooling system to avoid mill vibrations and achieve a ...Web
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Abstract. The use of roll gap lubrication system in combination with work roll cooling and antipeeling systems in hot rolling mills is discussed. The roll gap …Web
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Abstract and Figures. Hot rolling experiments have been conducted, using low carbon steel strips. The effects of water, oil/water emulsions, neat oil and dry conditions at the roll/strip surface ...Web
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The advanced work-roll lubrication package (A-WRL) for hot rolling and ESP mills is using specially designed mixer-nozzle units to mix the water/oil emulsion very close to the …Web
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Liu Z D and Song X W 2005 Debugging and application of process lubrication system in CSP Mill of Tangshan Iron and Steel Co., mtd., J. STEEL ROLLING, 22 47-49. ... Optimization of work roll ...Web
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In the early 1980s, the United States Steel Corp. (USS) found the gears in their Gary Works, Ind. hot strip mill to be in poor condition. A number of these large gears failed, causing downtime and ...Web
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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 rolling …Web
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PROBLEM TO BE SOLVED: To provide a hot-rolling mill lubricant enabling to cut rolling cost by effectively lower rolling force when steel materials are heated and rolled in a range of 200-1,200°C, and provide a steel hot-rolling method using this lubricant. SOLUTION: This hot-rolling mill lubricant comprises a base oil and at least one kind of polymer selected …Web
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Furthermore, roll gap lubrication in the hot rolling mill stands reduces the rolling force and torque by up to 40 % [3]. Roll gap lubrication also improves work roll service life time and can ...Web
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The mill is run without liquid lubrication; hence, the only possible lubricant in this mill is the oxide in roll gap. Softer oxides can act as lubricants (Schey, 1983), and it was observed during on-line roll surface monitoring that oxide formation reduces COF (Uijtdebroeks et al., 2002).Web
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Rolling Lubricant Function. The lubricating requirement of a rolling lubricant is to control the friction and wear in the contact zone between the rolls and the workpiece as new metal …Web
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A method and apparatus for applying hot rolling mill lubricants composed of water and difficulty dispersible oil to the rolls of rolling stands used to reduce hot steel whereby the lubricant is applied only during the period when the workpiece contacts the rolls of the rolling stands. The oil is continuously circulated in a loop system to maintain it at a desired …Web
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The Dropsa air-oil lubrication system has 5 Stand Tandem Cold Mill to lubricate the bearings and seals positioned inside the Working Roll / Intermediate Roll / Back-up Roll chocks. The function is achieved by using Dropsa's SMX progressive dividers, tailor-made splitter tubes, cutting-edge control panel and other components. A lubrication cycle of …Web
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High-demulsibility lubricant is used for back-up roller-bearing lubrication in both cold- and hot-rolling mill steel production applications. ... or left in the system until the mill experiences bearing failures ($30,000 each). Depending on the amount of water in the oil, the viscosity will change. In an extreme case, oil-analysis reports ...Web
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Today, cold and hot strip mills around the globe are continuously looking for ways to increase their productivity, save energy, lower their overall costs and improve the final quality of their products. Using lubricant in cold rolling and controlling the roll-wear in hot rolling are some of the ways to achieve these goals.Web
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lubrication system for hot rolling mill wherein the headers are provided with swiveling arrangement for changing the impinging angle of oil-water dispersion as per need. A still further object of the present invention is directed to providing a roll bite lubrication system for hot rolling mill wherein all major components except mixerWeb
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ROLLING MILL LUBRICATION SYSTEMS. PROTECTING CRITICAL HIGH-SPEED ROLL HOUSING PARTS. primetals MAIN BENEFITS •Fully assembled and factory-tested …Web
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Gear lubrication system consisting of three individual systems for two winder gear cases and one for the pinion stand directly mounted on ... Maximum Weight 25 ton (including sleeve) Mill Stand #2 Work Roll Diameter: Drive Motor 2 x 750 kW @ 520/1,400 rpm Temper Mill (both Stands) 510 mm ~ 560 mm Pinion Stand 1.5 : 1 (2-inputs, 2-outputs)Web
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The use of roll gap lubrication system in combination with work roll cooling and antipeeling systems in hot rolling mills is discussed. The roll gap lubrication is used to reduce rolling loads and ...Web
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Hot rolling lubrication has the following functions. (1) Reducing the friction coefficient between roll and rolled strip during hot rolling. The friction coefficient without …Web
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To reduce roll wear and chatter vibrations in its hot strip mill, Eko Stahl carried out roll gap lubrication trials. The trial equipment, the lubricant and the trials themselves are described. Rolling force and consequently electric energy consumption were reduced by 8 to 34 %. The automation system reacted withoutWeb
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Coolant is used for multiple reasons: 1) to cool rolls; 2) to provide lubrication (in cold mills); 3) to control product temperatures (for example in inter-stand cooling stations in hot mills); and 4) to control the thermal profile (in most cold sheet mills, many other cold mills, and increasingly even in hot mills).Web
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When Δ x = 0 mm, the amplitude–frequency characteristic curve of the coupling system of the hot rolling mill is as shown in Figure 13 (gap Δ x = 1 mm in Figure 11) with the decrease in the gap Δ x between the roller bearing seat and the mill housing in the horizontal direction. The vibration amplitudes in the horizontal and vertical ...Web
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In hot strip mill systems, circulating oils lubricate back-up roll bearings: • Operate under hydrodynamic lubrication. • Require higher viscosity oils (ISO 460-680). • Acceptable water level threshold of 2%. • Antiwearand EP additives not needed. Lubrication requirements vary by application Hydrodynamic Wedge Bearing Journal OilWeb
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Whatever the lubricant, rust inhibitors should be part of its formulation. Within the press section, felt rolls carry the felt that absorbs and conveys away the water in the paper web. Spherical roller bearings and toroidal, nonlocating …Web
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the hot strip mill for SAIL RSP in Rourkela (India) are two examples of full turn-key projects. In these projects the scope of Primetals Technologies includes civil works, bays, steel structures and cranes, water treatment plant, roll shop, slab and coil yards. The hot strip mill for ArcelorMittal Poland was installed within 24 months from contractWeb
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This study aims to provide a new insight into the lubrication film at roll/strip interface in hot rolling. A series of lubricated hot rolling tests were performed by a 40wt% sodium metaphosphate aqueous solution under 20–60% reduction, at 950–1150 °C and 0.5 m/s. Thermal behaviors of sodium polyphosphate and the rolled strip samples were ...Web
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