the controlled rolling and cooling by the new rolling mills proved to Photo 1 Compact rolling mill Type Motor capacity Rolling passes Mill rigidity Roll diameter Roll gap adjustment Manufacturer Hauzing-less AC 5400 kW 4 440 t/mm 720 mmφ × 700 mm long Remote control (onload screw down) Danieli (Italy) Table 1 Specifications of Compact Rolling ...
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Transcribed image text: Speed control systems are used in steel mills for rolling the steel sheets and moving the steel through the mill . The block diagram of an armature- controlled DC motor with a load torque disturbance is shown in figure 2, where it is assumed that La is negligible.
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Torsional Vibration between Metal Rolling Rolls and a Rolling Mill Motor, may occur in recent days, as a result of higher speed response adjustment for variable speed rolling mill motor drive system. Therefore online transfer function analysis, in which white noise signal is superposed to speed reference signal in between real rolling operation, is applied to the …
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The workhorse roughing mill has 135" wide rolls for rolling 'broadside' (as the first roughing mill is commonly called) to make a slab wider. A 5,000 hp motor drives 42"-diameter work-rolls through 28:1 gears to reduce the
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John G. Lenard, in Primer on Flat Rolling (Second Edition), 2014 2.7 Generation III – Coil Box Hot Strip Mills. In the 1970s, Stelco of Canada developed the hot coil box designed for installation in hot strip mills ahead of the finish mill for coiling the transfer bar from the roughing mill and uncoiling it into the finishing mill. The coil box reduced the distance between the roughing mill ...
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Abstract: In the rolling mill main drive system, a shaft torsional vibration is often generated when a motor and a roll are connected with a flexible shaft. The state feedback control can effective suppress the torsional vibration of the main drive system of rolling mill. Because of the difficulty of measuring the load speed and the shaft torque, moreover the sensitive of …
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During the idle operation i.e. for 40% of the time, 20-30% of load, motor speed can be reduced to a very low value or if permitted, stop the motor frequently, which will lead to some energy saving. RE: Overload Performance of VFD in Hot Rolling Mill Application
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Answer (1 of 2): I have commissioned over a hundred rolling mills and never seen anything except an AC induction motor. This question reads like something from a …
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DC motor for a rolling mill. Stahl- und Walzwerke / GS. Stahl- und Walzwerke / SYN - copy. Application: DC motor replaced the old tandem motor from 1908. Power: 3,800 kW. Speed: 0-52/120 rpm. Weight: 110,000 kg.
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Hot strip finishing mill is initially set up with rolling conditions such as roll speed, roll gap, and cooling pattern obtained by a set-up model. To improve the accuracy of initial roll speed setting for a 7–stand finishing mill, an equation for predicting forward slip and a compensation method for initial roll speed setting were proposed ...
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Rolling mill DC motors are best at low speed, high torque applications, while AC motors typically need to run above 800rpm to be cost effective. Also the case for higher efficiency of AC motors is many times negated by the wasteful braking methods of some AC drive systems.
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High speed wire mill production line process sharehttps://
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Low speed, high torque, reversible hydraulic motors are employed as direct drives for the rolls or spindles of hot rolling two high reversing mills. The use of these motors is cheaper in capital...
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AC adjustable speed motor drive systems are the preferred technology for new rolling mill installations and modernization projects. TMEIC designs and manufactures two types of AC solutions for this purpose. Salient pole synchronous motors that meet the high power and torque demands of a hot strip mill, as well as roughing and finishing stands.
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As compared with conventional analog control, fully digital speed control permitted more stable rolling mill operation, reducing both threading and accelerating times by 50 and 27 percent ...
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ZZJ-800 series. Power: 200 kW - 100,000 kW. Rotational speed: 550 rpm - 1,025 rpm. ... IC01, IC06, IC17, IC37 and ICW37A86 ZZJ motor ZZJ-800 series motor is a DC motor for metallurgical lifting, suitable for rolling mills, cranes, ... Compare this product Remove from comparison tool. See the other products.
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I purchased plans, and am in the process of having a Mcdonald rolling mill made. Rather than chain and sprockets I want to go with a motor and reduction gear box that I have seen others do. What I can't seem to extract from the WIPs I've read is what HP motor and what speed reduction is required.
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1/2 hp motor with a chain drive gear, and a gear on your rolling mill where the handle goes will work. A belt and pulley would not work very well, if at all. A chain drive will. A motor that will not strain when you begin rolling is what is needed. Small reductions each pass would make it easy. Richard in Denver
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TMEIC2 installed its first AC adjustable-speed motor drive system for a rolling mill main stand in 1980; by January 2004 TMEIC had installed AC adjustable-speed motor drive systems on more than 700 main mill stands, coilers and reels, constituting more than 2,400 MW of installed main drive power. 2. TMEIC: includes equipment supplied by Toshiba
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We are offering Steel Rolling Mill Duty Motor to our clients. Re-rolling mill duty motors are used to drive the re-rolling mill where hot steel billets are rolled in to RODS, FLAT BARS, RAILS, CHANNELS, ANGLES and SHEETS etc.The …
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We are here in Aluminum Rolling Mill with problems of Rolling Mill Chatter. The arrangement of the drive train is like this. We have two old GE motors [type MCF-8, 4000HP, 300/750 rpm, 700V] driving the input shaft of the gear box. The output of the gear box is connected to the pinion gear box and from pinion the two spindles drives the top and bottom …
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A motor speed control device for a rolling mill, which includes a rolling roll that rolls a metal material, a roll rotation shaft directly connected to the rolling roll, a motor rotation shaft that transmits power to the roll rotation shaft, and a motor that drives the motor rotation shaft, includes: a non-contact type speed sensor arranged at a position close to the rolling roll with …
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Strength of rolling: ∅200 mill：152kN; ∅150mill：107.8kN. Space of rolling: ∅200 mill:2.86kNm; ∅150 mill：1.61kNm. Transmission motor: DC motor; Power: 1600kW×three or 4500 kW AC inverter motor; Rotating speed: 1000~1300 r/min; Working rotary speed: 900~1100r/min
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After the 12th rolling mill, vertical loopers are set up between the stands to implement tension-free rolling, thus producing high-precision products. The bar rolling mill line is controlled automatically by the computer to realize single-line continuous rolling with the maximum finishing speed of 16 m/s. Parameters Reheating Furnace
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The main methods of controlling the tension in the mill is with a tension free rolling speed control system and manually monitoring the current drawn by each motor as the bar proceeds through the mill. A looper table can be used to aid in keeping the bar tension free between stands.
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I can easily get 1/16" reduction per pass (I've taken double, but I can tell it's working the motor), when I'm in the say 0.300-0.750 range (I don't use the rolling mill above this thickness, and my rollers will only separate about 1"), but I go to about half that reduction when I get into the sub 0.300 range.
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The most suitable motor for a steel mill requiring a motor having high starting torque, wide spread range and precise speed control is_____. a. DC shunt motor. b. DC series motor. c. Wound rotor induction motor. d. Plain squirrel cage induction motors. 18. For automatic drives the preferences is for_____. a. Synchronous motors. b. Ward-Leonard ...
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Variable speed drives for rolling mills Rolling mills demand high precision and high overload capability. The mill is subjected to rapid change in load speeds, forcing equally quick generating and braking actions. This demands a constant torque in a wide speed range and large torque steps. ABB medium voltage drives are the perfect answer for the
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the same time, the increased running speed brings out possible vibration problems in the rolling process, especially in a cold strip mill. If the thickness variation of the hot-rolled aluminum strip can be reduced, it will be possible to increase the production speed of the cold strip mill. These claims set new demands on the acceptable rolling
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