ОБРАБОТКА МЕТАЛЛОВ Том 25 № 2 2023 14 ТЕХНОЛОГИЯ References 1. Li G., Yi S., Li N., Pan W., Wen C., Ding S. Quantitative analysis of cooling and lubricating eff ects of graphene oxide nanofl uids in machining titanium alloy Ti6Al4V. Journal of Materials Processing Technology, 2019, vol. 271, pp. 584–598. DOI: 10.1016/j.jmatprotec.2019.04.035. 2. Joseph Babu K., Prabhakaran Nair K., Joy M.L. Development of cutting fl uid from transesterifi ed coconut oil and evaluation of its tribological properties. Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology, 2019, vol. 233 (3), pp. 369–379. DOI: 10.1177/1350650118785467. Predicting the coolant lubricating properties based on its density and wetting eff ect Anton Kisel’ 1, a, *, Vyacheslav Churankin 2, b 1 Kaliningrad State Technical University, 1 Sovetsky Prospekt, Kaliningrad, 236022, Russian Federation 2 Omsk State Technical University, 11 Prospekt Mira, Omsk, 644050, Russian Federation a https://orcid.org/0000-0002-8014-0550, kisel1988@mail.ru, b https://orcid.org/0000-0002-6031-1340, churvg@mail.ru Obrabotka metallov - Metal Working and Material Science Journal homepage: http://journals.nstu.ru/obrabotka_metallov Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science. 2023 vol. 25 no. 2 pp. 6–16 ISSN: 1994-6309 (print) / 2541-819X (online) DOI: 10.17212/1994-6309-2023-25.2-6-16 ART I CLE I NFO Article history: Received: 24 January 2023 Revised: 27 February 2023 Accepted: 21 March 2023 Available online: 15 June 2023 Keywords: Coolant Friction machine Lubricating action Coeffi cient of friction Coolant effi ciency Density Limiting wetting angle Empirical dependence Acknowledgements Research were partially conducted at core facility “Structure, mechanical and physical properties of materials”. ABSTRACT Introduction. The processes occurring in the cutting zone contribute to the rapid wear of the cutting tool and a decrease in the quality of the workpiece. It is possible to reduce the impact of negative factors during metal cutting through a rational choice of coolant. The aim of the work is to develop a methodology for the accelerated assessment of the coolant lubricating properties. Methods. This paper presents experimental studies of the lubricating eff ect of seven diff erent grades of coolant, during friction of a T15K6 (15 % TiC–79% WC–6 % Co) hard alloy pad and a rotating roller made of carbon structural Steel 45 (0.45 % C) are presented. As a parameter of coolant effi ciency in terms of lubricating eff ect, this paper proposes an effi ciency coeffi cient Kc, which is equal to the ratio between the friction coeffi cient that occurs when using coolant and the friction coeffi cient during friction without coolant. The lower the coeffi cient Kc, the more eff ective this coolant is in terms of lubricating eff ect. Results. Empirical dependences of the coeffi cient Kc on the coolant density ρ and the limiting wetting angle Θ (Kc = f(ρ; Θ)) are established. Since the low signifi cance of the parameter ρ is established, the formula for the dependence of the Kc only on the limiting wetting angle Θ (Kc = f(Θ)) is established in the work. It is established that the dependence formula (Kc = f(Θ) provides the highest accuracy of calculations. Discussion. After evaluating the research results presented in this paper, the following conclusions are made: 1) the paper establishes the infl uence of the coolant density and the limiting wetting angle on the coolant effi ciency coeffi cient for the lubricating eff ect determined for the friction between a roller made of Steel 45 and a pad made of T15K6 alloy: Kc = f(ρ; Θ) and Kc = f(Θ); 2) the greatest accuracy of calculations from 2.75 to 15 % is provided by the formula for the dependence Kc = f(Θ); 3) the dependence Kc = f(Θ)is proposed to be used for the method for the accelerated assessment of the coolant lubricating properties during friction of a pad made of T15K6 alloy and a rotating roller made of Steel 45. The proposed method consists in measuring the limiting wetting angle of a coolant drop on the surface of the workpiece and calculating the derived empirical dependence of the coolant effi ciency coeffi cient on the lubricating eff ect. For citation: Kisel’ A.G., Churankin V.G. Predicting the coolant lubricating properties based on its density and wetting eff ect. Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) =Metal Working and Material Science, 2023, vol. 25, no. 2, pp. 6–16. DOI: 10.17212/19946309-2023-25.2-6-16. (In Russian). ______ * Corresponding author Kisel’ Anton G., Ph.D. (Engineering), Associate Professor Kaliningrad State Technical University, 1 Sovetsky Prospekt, 236022, Kaliningrad, Russian Federation Tel.: +7 (999) 458-08-25, e-mail: kisel1988@mail.ru
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