DOI: 10.18503/1995-2732-2020-18-1-71-79
Abstract
Problem Statement (Relevance): The paper analyzes tension formation on the tension leveller (TL) of the continuous pickling line of the wide-strip cold rolling mill at PJSC MMK. Mathematical models were developed to identify a relation between the operating electric drives of TL and the parameters of strips and complex planetary gearboxes. Objectives: To ensure a steady operation of TL due to a correct setting of electric drive torque and speed parameters for various strip grades. Methods Applied: Collection and processing of experimental data on the distribution of strip tension in TL and adjacent tension stations by oscillographic testing of torques and speeds of electric drives; mathematical modelling of speed and power parameters on the drive shafts of TL. Novelty: It lies in the development of a mathematical description of the actual strip elongation depending on a bridle roll diameter; the mathematical model shows a relation between strip tension and the set strip thickness, between loads of the main drive and the lengthening drive. Findings: It was found that the actual strip elongation can vary in a wide range from 1.5% to 3.1%. Some average value of 2.3% can be achieved by changing roll diameters in a fairly narrow range. It was found that a change in diameter of 1 mm causes a change in the actual elongation of approximately 0.1%. By analyzing changes in back and front strip tension in the function of the main drive motor load and the lengthening drive, the authors worked out the formulas to calculate the strip tension on the TL section. It is established that the load of the lengthening drive directly determines the strip tension before entering TL. Practical Relevance: The resulting dependencies used to calculate speed and power parameters of electric drives make it possible to correct the set speed of electric drives of TL to maintain the specified elongation and avoid unacceptable loads of planetary gear elements for various strip grades.
Keywords
Continuous pickling line, tension leveller, strip tension, planetary gear, electric drive, mathematical model, lengthening drive
For citation
Kornilov G.P., Filatova O.A., Filatov A.M., Khramshin T.R., Khramshin R.R. Studying Drives of the Tension Leveller on the Continuous Pickling Line of the Cold Rolling Mill. Vestnik Magnitogorskogo Gosudarstvennogo Tekhnicheskogo Universiteta im. G.I. Nosova [Vestnik of Nosov Magnitogorsk State Technical University]. 2020, vol. 18, no. 1, pp. 71–79. https://doi.org/10.18503/1995-2732-2020-18-1-71-79
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