Browsing by Author "Koynov T."

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    Application of between- stand cooling in the production hot – Rolled strips
    (2016-06-01) Muhin U.; Belskij S.; Makarov E.; Koynov T.
    Medium grain size has been uneven over the length of hot-rolled strips of austenite of low-carbon steel during rolling on continuous mill. Assess the possibilities of metal microstructure of hot-rolled strip stabilization system between-stand refrigeration line. Rolling low carbon strips developed modes with increasing temperature end rolling along the length of the strips and rolling modes using between-stand cooling with variable flow cooling water. Using this technology mode allows you to get a uniform cooling microstructure of metal strips and cut to length machine time rolling on 14 – 18%. Treatment with an increased acceleration stabilizes the metal microstructure on rolling strips on top of the thread speed and reduces the machine time rolling on 3-9%.
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    Simulation of accelerated strip cooling on the hot rolling mill run-out roller table
    (2016-06-01) Muhin U.; Belskij S.; Makarov E.; Koynov T.
    A mathematical model of the thermal state of the metal in the run-out roller table continuous wide hot strip mill. The mathematical model takes into account heat generation due to the polymorphic γ → α transformation of supercooled austenite phase state and the influence of the chemical composition of the steel on the physical properties of the metal. The model allows calculation of modes of accelerated cooling strips on run-out roller table continuous wide hot strip mill. Winding temperature calculation error does not exceed 20°C for 98.5 % of strips of low-carbon and low-alloy steels.
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    Study of the influence between the strength of antibending of working rolls on the widening during hot rolling of thin sheet metal
    (2016-06-01) Muhin U.; Belskij S.; Koynov T.
    Based on the variation principle of Jourdan was developed a mathematical model of the process of widening freely in hot rolling of thin sheet metal. The principle applies to rigid-plastic materials and for the cinematically admissible area of speeds. The developed model allows to study the distribution of the widening on the length of the deformation zone depending on the parameters of the rolling process and sheet metal. Results are obtained, characterizing the size of the widening and effectiveness of the process control on tension at the entrance and exit from the stand. The widening is dependent on the strength of anti bending.
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    Testing of hot rolled strips with the inverse temperature wedge
    (2015-01-01) Muhin U.; Koynov T.; Solovyov V.; Bobkov E.; Mazur S.
    It is theoretically possible to increase the productivity of a hot rolling mill due to a greater acceleration in the finishing train at a constant initial rolling speed. This will increase the rolling end temperature along the strips. Changes in deformational, speed and temperature modes require research into changes in the rolled stock mechanical properties along the strips. The article presents the results of industrial research on the way the rolling end temperature increase influences the mechanical properties of St3 hot-rolled steel.