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ABB also replaced Mycron Steel''s force motor valve for cold rolling mill roll gap control with the latest servo valve system. Continuing production with an obsolete automation and drive system is done with great risk of component failure. In this project, ABB made a complete review of the system in
They also include a separate hydraulic unit with hydraulic pump and control panel, hydraulic cylinders to transfer the contact pressure to the rolls, adjustable roll nip pressure between 50bar and 80bar, and a safety function that causes rolls to disengage when a foreign object passes. Laboratory roll mills for industrial grinding
As 8 A 1. hydraulic fluid dirty 2. hydraulic fluid s 1. Stickslip effect due to the friction of the cylinder packings being too high. 2. operating below lower limit of motor speed insufficient load counterbalance ( lowering control valve) D Power Takeoff either does not turn at all, or .
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Hot Rolling Mills. 54/154. Processes technologies; Technological packages; HAGC. Hydraulic automatic gauge control. BENEFITS. Fastresponse thickness control ; Highaccuracy gap positioning ; Smaller thickness tolerances and faster thickness correction ; Reliability and easy maintenance design ; Backup roll eccentricity compensation ;
The cold mill roll gap should start out being set to the same profile as the crown of the incoming hot mill product. Then, as the cold mill gap is adjusted to reduce the crown, the coil also will come out flatif the hot mill got the relationship between crown and flatness right to begin with. If the cold mill rolls or hot mill coils have too ...
Nov 12, 2013· the roll gap, or the roll bite) between the work rolls. In this region the metal is plastically deformed, and there is slipping between the strip and the work roll surface. The necessary compression force is applied by hydraulic rams, or in many older mills by a screw arrangement driven by an electric motor [6]. Figure 1.
HGC (Hydraulic Gap Control) cylinder. The AGC system provides the reference value for the HGC positioning system. Figure 1 Schematic structure of a hot rolling mill The thickness of the rolled material is measured by an XRay thickness gauge in the last pass. This measurement is possible within several meters distance from the
Hydraulic oil level low. Hydraulic oil level low pumps stopping. Determine what is causing the drop in oil level. Add clean oil. The pumps will stop automatically if the level drops to the shutdown level. Pump fault MCC or standby pump fault MCC (identified by pump) Motor output gives alarm to control desk if that pump is not running.
cast slabs into plate, the plate into hot rolled coils and the hot rolled coil into cold rolled coil. Many of these old mills are still running today as a result of upgraded electrical and hydraulic systems, including hydraulic screwdowns, hydraulic roll bend, and tension control.
Modification of Hydraulic Roller Bending Force Control System. Iron and Steel, 2001, 36(11) ：37~40. （in Chinese） [2] Liu Xun, Hu Jun, Hu Gaoju. Study of Electrichydraulic Servovalve Control System For Hydraulic Bending Roll System Chinese Iron and Steel Conference 2003 ：861865. （in Chinese） [3] Wang Yiqun, Liu Yu.
May 23, 2018· To these ends, an edger of the hot strip mill will be upgraded, short stroke HAGC (hydraulic gap control cylinders) will be installed in the finishing mill, .
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A roll configuration that extends the working gauge range of the leveler without requiring roll cassette changes or two separate levelers; Interroll tension control that provides tension between every work roll; Independent entry/exit work roll bending; A proprietary roll configuration that covers up .
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John G. Lenard, in Primer on Flat Rolling (Second Edition), 2014. Friction and Wear. Work rolls in hot strip mills wear due to friction between the roll surface and hot strip. (Backup 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 tandem cold mill).
Aug 16, 2015· TwoRoll Rubber Mixing Mill Selection Questionnaire 1. TwoRoll Mill Selection Questionnaire Page 1 of 4 QUESTIONNAIRE FOR 2ROLL MILL REQUIREMENT Criterion Please Answer Descriptively if needed Production Requirement: _____ Tons/Hour ; _____ of 8 hour Shifts/Day What is your expectation from this Mill?
Hydraulic gap controls, with mill steer and roll eccentricity compensation. • Work roll chock mounted scratch brushes. • Fast work roll change. • Adaptive and predictive process control technology using temperature sensors and profile and thickness gauges. • Efficient spray control systems providing highresolution thermal control of ...
Apr 19, 2019· To be installed in Ningbo, Zhejiang Province, eastern China, the new 20 high cold finishing mills for Ningbo Powerway Alloy Material Co will competitively roll .
The mills will be capable of using a large range of workroll diameters, from 37 to 80 mm, in order to achieve efficient and economic rolling performance. The final applications of the highperformance copperalloy strip produced by Ningbo Powerway Alloy Material Co. will be mainly used for aerospace, highspeed trains, solar energy ...
18 Roll Hydraulic Rolling Mill There are two types of 18roll hydraulic rolling mill—Zhigh type and Shigh type, in which 4 sets of side support devices are added to the HC six roll mill. The rolling mill is suitable for processing stainless steel, carbon steel and nonferrous metal strips.
Jun 12, 2015· In order to improve the control performance of strip rolling mill, theoretical model of the hydraulic gap control (HGC) system was established. HGC system offline identification scheme was designed for a tandem cold strip mill, the system model parameters were identified by ARX model, and the identified model was verified. Taking the offline identified parameters as the initial values, online ...
Steel Steel Hot strip: The rolling of hot strip begins with a slab, which is inspected and, if necessary, surface cleaned either manually or by scarfing machines with oxyacetylene torches. The slabs are then pushed, or walked on their broadside, through gasfired furnaces that have a hearth dimension of about 13 metres by 30 metres. In a pushertype furnace, the slabs slide on watercooled ...
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