OBRABOTKAMETALLOV Vol. 27 No. 3 2025 technology Influence of cutting speed on pulse changes in the temperature of the front cutter surface during turning of heat-resistant steel 0.17 C-Cr-Ni-0.6 Mo-V Valery Gvindjiliya a, *, Evgeny Fominov b, Andrey Marchenko c, Tatiana Lavrenova d, Svetlana Debeeva e Don State Technical University, 1 Gagarin square, Rostov-on-Don, 344000, Russian Federation a https://orcid.org/0000-0003-1066-4604, vvgvindjiliya@donstu.ru; b https://orcid.org/0000-0002-0165-7536, fominoff83@mail.ru; с https://orcid.org/0000-0003-4028-6712, tobago13@yandex.ru; d https://orcid.org/0000-0002-8283-7730, bys_ka87@mail.ru; e https://orcid.org/0000-0002-2796-2424, sve_tchk@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. 2025 vol. 27 no. 3 pp. 23–36 ISSN: 1994-6309 (print) / 2541-819X (online) DOI: 10.17212/1994-6309-2025-27.3-23-36 ART I CLE I NFO Article history: Received: 13 April 2025 Revised: 25 April 2025 Accepted: 21 May 2025 Available online: 15 September 2025 Keywords: Longitudinal turning Heat-resistant steel Kinematic disturbance Front surface temperature ABSTRACT Introduction. This paper is devoted to the evaluation of the influence of periodic fluctuations of machining mode parameters on the change of the maximum temperature of the front surface of the cutter. Subject of research. Fluctuations of cutting mode parameters are considered as deviations of their values relative to the nominal ones, resulting in periodic changes in the cross-sectional area of the cut layer and the interaction conditions between the chip and the tool’s front surface, which affect temperature changes in the cutting zone. The purpose of this work is to evaluate the influence of periodic fluctuations of machining mode parameters at different cutting speeds on the variation of the maximum temperature of the cutting tool’s front surface during turning of heat-resistant steel 0.17 C-Cr-Ni-0.6 Mo-V on a long-life machine without cooling. Method and methodology. The finishing longitudinal turning process of heat-resistant steel 0.17 C-Cr-Ni-0.6 Mo-V on a long-life machine without cooling was investigated. During machining, tool vibrations were measured along three coordinate axes while varying the cutting speed at constant depth of cut and feed. Using digital simulation modeling based on input data obtained from in-situ experiments, the moments in the system dynamics when each cutting mode parameter reaches extreme values due to fluctuations were identified. Deviations of the maximum design temperature from the corresponding nominal value were then determined. Results and discussion. It is established that variations in machining speed change the factors destabilizing the thermal state: at low speeds, the main sources of temperature deviations in the investigated cutting system are moments when extreme values of cutting depth and speed are reached; at higher speeds, fluctuations of cutting depth and feed have the greatest effect. It is revealed that when machining parameters reach extreme values, instantaneous temperature generally increases, and cutting speeds at which such deviations are minimal are identified. For citation: Gvindjiliya V.E., Fominov E.V., Marchenko A.A., Lavrenova T.V., Debeeva S.A. Influence of cutting speed on pulse changes in the temperature of the front cutter surface during turning of heat-resistant steel 0.17 C-Cr-Ni-0.6 Mo-V. Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science, 2025, vol. 27, no. 3, pp. 23–36. DOI: 10.17212/1994-6309-2025-27.3- 23-36. (In Russian). ______ * Corresponding author Gvindjiliya Valery E., Ph.D. (Engineering), Senior Lecturer Don State Technical University, 1 Gagarin square, 344000, Rostov-on-Don, Russian Federation Tel.: +7 918 583-23-33, e-mail: vvgvindjiliya@donstu.ru Introduction One of the main factors determining the wear resistance of cutting tools is the temperature in the machining zone. Over the past decades, a significant number of scientific studies have been devoted to the assessment and prediction of maximum temperatures on the surface of cutting tools. Experimental methods for determining this parameter by contact measurement and analysis of heat emission have been proposed [1–3], and various analytical dependencies for predicting temperature have been presented [4–7]. Another relevant area of research is the assessment of the influence of process conditions on the temperature in
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