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The automatic tension control system of the three-stand continuous roughing train of the 2000 hot-rolling mill at the Magnitogorsk Metallurgical Combine is analyzed. Deviations in interstand tension that are several-fold higher than the set values and inadmissible compression are detected. The causes of poor tension control are determined, such as a large error in measured roll pressure and short...
The paper defines the main causes of impermissible dynamic loads in the shaft assemblies of a horizontal plate mill stand. It substantiates the development and commercialization of a stationary telemetry system for continuous control of the torque of the shaft assemblies at the 5,000 mm mill stand at Magnitogorsk Iron and Steel Works, OJSC. The authors determine the main system functions and list...
The article deals with the impact load decrease methods by the example of a rolling stand electric drive of a hot plate mill 5000 OJSC “Magnitogorsk Iron & Steel Works”. The mathematical description of a synchronous motor, which is used to rolling stand, has been provided. A simulation model was developed based on the mathematical description of the synchronous motor. This model is carried out...
In the article is devoted to electromagnetic compatibility (EMC) analysis of 18-pulse AC-DC circuit consisting of three level active front end (AFE) rectifiers based on a pulse width modulation selective harmonic elimination (PWMSHE) method with three switching angles for quarter-period. 18-pulse AC-DC circuit is made as a parallel connection of three power transformers which have the secondary winding...
The article describes the thickness control system of the plate rolling mill. A complex flatness control system of the rolling mill as a mechatronic system was developed. Electric and hydraulic control mechanisms of the sheet thickness were considered. The mechanisms control scheme and the signals transmission scheme of the rolling mill were composed. The block diagram of the screw-down mechanism...
The main types of hydraulic cylinders as actuators mechanisms. The differences in the cylinders with single and double stem were given. The simplest scheme of hydraulic drive was composed, moving objects with a mass. For the control valve the equation of static characteristics was obtained, associated fluid flow with control signal. The results were compared with the real object. According to the...
This paper addresses the simulation modeling of the rolling mill stand 5000 OJSC MMK. The main purpose is to simulate a synchronous. The close loop control system of the synchronous drive was made. The modeling results were simulated by the Matlab/Simulink program. The result modeling of the rolling mill stand 5000 were carried out at the difficult-to-form steel grade X70 in the range of roughing...
The article deals EMC research of 18-pulse circuit consisting of three level neutral point clamped (3L-NPC) converters with selective harmonic elimination (SHE) algorithm. Main object of research is power circuit of wind-driven electric plants based on 18-pulse circuit consisting of three 3L back-to-back (BtB) converters. A review of contemporary condition of power electronics for application in wind...
This paper addresses the issue of associating a concept of Smart Grid with a main electric drive of plate mill rolling stand. This paper will review all theoretical capabilities of reactive power compensation in the supply mains by the main electric drive and present the resulting benefits to be gained in our understanding of the Smart Grid. Typical features of power electric equipment of the main...
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