Browsing by Author "Kuznetsow, Eugene V."

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Determination of Conditions for Preventing Chemical Wear of Induction Furnace Lining in the "Cupola Furnace – Induction Furnace" Duplex Process
(TECHNOLOGY CENTER PC, Kharkiv, 2025) Nikolaev, Denis A.; Selivorstov, Vadim Yu.; Dotsenko, Yuriy V.; Osypenko, Iryna O.; Kuznetsow, Eugene V.
ENG: The object of research is the melting of cast iron in the “cupola furnace – induction furnace” duplex process. The need to study such a duplex process is dictated by the condition of ensuring the required quality of cast iron in the event that a low-quality or uncontrolled charge is used. This condition cannot be met if the induction furnace is used as the only melting unit. But the problem is that in the process of induction melting of cast iron, in particular at the stage of overheating and holding the melt, a crucible reaction may begin, which leads to chemical wear of the lining. The need to reduce the carbon content in the melt discharged from the cupola furnace requires an increase in temperatures, which creates risks for the onset of a crucible reaction. Based on statistical calculations of cupola melting parameters, it was found that in the melt discharged from the cupola furnace into the induction furnace, the average carbon content is C = 3.47% with a standard deviation SC = 0.14%, and the average silicon content is Si = 2.05% with a standard deviation SSi = 0.21%. At the same time, with a probability of 96%, the carbon content is C = (3.33–3.75)%, and the silicon content corresponds to the range Si = (1.84–2.46)% with a probability of 98%. It was found that the equilibrium constant is in the range (0.15–0.21) with a probability of 97.8% at an average temperature T = 1355°C with a standard deviation of temperature ST = 6°C. With such melt parameters, which are supplied to the induction furnace, the risks of the onset of a crucible reaction do not arise. It was determined that even at temperature regimes sufficient to remove FeO, the risk of the onset of a crucible reaction is minimal. In order to ensure conditions that prevent the onset of a crucible reaction, the following recommendations should be followed for the content of carbon and silicon in high-temperature melting when the temperature is in the range T > 1480°C: C > 0.3% and Si < 0.3%. The results of the study can be used in the melting sections of foundries equipped with cupola furnaces and induction furnaces.
The Phenomenon of Thermodynamic Action during Plastic Deformation of Metals and Their Alloys
(Український державний університет науки і технологій, ННІ ≪Інститут промислових та бізнес технологій≫, ІВК ≪Системні технології≫, Дніпро, 2024) Kuznetsow, Eugene V.
ENG: The most important problem of modern technology for mechanical processing of structural materials is to increase the efficiency of shaping operations. Its full value solution requires the establishment of a functional relationship between the parameters of the force influence on the workpiece and the characteristics of the natural adaptive behavior of the processed material. In this regard, using metals and their alloys as an example, the mechanism and general laws of thermodynamic excitation of solid crystalline bodies during plastic deformation are considered. The relationship between the change in the thermodynamic potentials of the substance of the deformed volume and its behavior during the process of shape forming, as well as in the postoperative period, is described. It is shown based on the synergetic method of analyzing highly nonequilibrium systems that from a technological point of view the most favorable adaptive functional response arises in the case when the deforming influence is exerted taking into account the natural ability of the workpiece substance to relaxation. The got results create the basis for improving the operations of mechanical processing of metals and their alloys by taking into consideration the properties and features of the natural deformation behavior of each concrete material under concrete conditions. They are applicable not only for metal forming operations, but also in cutting technology.