Load Modes of Mill 2000 Electric Drives at Rolling Hollow Billet

V.R. Gasiyarov, E.A. Maklakova, A.G. Shubin

Abstract


The technical and technologic problems taking place in the new rolling adoption of hollow billet programs at the 2000 hot rolling mill of OJSC "Magnitogorsk Iron and Steel Works" were noted in the article. The research experimental results of electric drive load mode of mill stand electric drives have been obtained. The motors of stand unbalanced load and an excess of sustained current over nominal values were confirmed. The task of more accurate calculation of rolling torque have been substantiated, as well as the distinctive features of torque calculation at high deformation region of metal at stand were noted. The torque calculation method which takes into account ratio of the deformation region height to the work roll radius has been developed. More accurate analytic dependences have been obtained to calculate a rolling pressure and a rolling torque. A specialized program for the calculation of electric drive load modes of rough and finish stands has been developed. The program algorithm was presented. The comparison results of equivalent motor currents calculation at the moment of tube steel grade rolling with the experimental data have been implemented. The adequacy of calculated load mode was affirmed by the real loads of the electric drive. A comparative analysis of the proposed and conventional methods has been executed by example of slab 300 mm rolling. The conclusion about accuracy of the calculation results was taken.


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References


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DOI: http://dx.doi.org/10.24892/RIJEE/20160204

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