OBRABOTKAMETALLOV Vol. 25 No. 1 2023 54 TECHNOLOGY Experimental study of the dynamics of the machining process by ball-end mills Mikhail Gimadeev a, *, Andrey Li b, Vera Berkun c, Vadim Stelmakov d Pacifi c National University, 136 Tihookeanskaya St., Khabarovsk, 680035, Russian Federation a https://orcid.org/0000-0001-6685-519X, 009063@pnu.edu.ru, b https://orcid.org/0000-0002-9907-4936, 011864@pnu.edu.ru, c https://orcid.org/0000-0002-5249-2612, 2015103121@pnu.edu.ru, d https://orcid.org/0000-0003-2763-1956, 009062@pnu.edu.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. 1 pp. 44–56 ISSN: 1994-6309 (print) / 2541-819X (online) DOI: 10.17212/1994-6309-2023-25.1-44-56 ART I CLE I NFO Article history: Received: 07 November 2022 Revised: 14 January 2023 Accepted: 21 January 2023 Available online: 15 March 2023 Keywords: Ball-end mill Surface roughness Vibration Correlation analysis Regression analysis Online monitoring Tool tilt Funding The study was carried out with the fi nancial support of the Ministry of Education and Science of the Khabarovsk Territory within the framework of the regional competition for grants in the form of subsidies from the regional budget for the implementation of projects in the fi eld of fundamental, technical, humanitarian and social sciences. Grant No. 93C/2022 on the topic “Improving the effi ciency of process equipment during machining through online monitoring of an acoustic signal”. Acknowledgements The authors express gratitude to A.V. Nikitenko, Ph.D. in Engineering Science, Associate Professor of the Department of Technological Informatics and Information Systems (PNU, Khabarovsk), for helping to organize and conduct experimental research at the CAD/CAM technology training and production center. Research were partially conducted at core facility “Structure, mechanical and physical properties of materials”. ABSTRACT Introduction. Due to a signifi cant number of factors affecting the change in the properties of a dynamic system, excessively conservative processing conditions are chosen to ensure the high quality of the resulting product. This limits the effi ciency of the process and leads to an increase in the cost of production. Accordingly, modern approaches are needed that will allow diagnosing the current state of processing and making timely decisions to replace the tool, correct or change the control program. The signifi cance of the ongoing research is to propose a real-time monitoring approach to milling control to identify emerging processing errors, predict potential problems and improve uptime. Subject. The paper discusses the features of the real-time monitoring system during mechanical processing with a single- and double-edge cutting tool, taking into account acoustic wave fi ltering, minimizing surface roughness. The purpose of the work is to determine the effect of the inclination orientation of the ball-end tool on the surface roughness value using real-time monitoring during milling on CNC process equipment. Methods. The study provides methods of correlation and regression analysis. The calculated data were obtained by means of vibroacoustic diagnostics and measured in the range of values of the variable angle of inclination of the surface for single- and double-edge cutting tool based on the provisions of the theory of oscillations and vibroacoustic diagnostics, cutting theory, digital processing and digital fi ltering of signals. Results and discussions. Experimental data obtained during machining made it possible to determine that an increase in the angle of inclination of a single-edge cutting tool has practically no effect on the change in the amplitude parameters of roughness. The values of vibroacoustic diagnostics and roughness, when using a double-edge ball-end tool, show a consistent picture with the effects created by the angles of inclination and advance. The obtained solutions to the problems of monitoring and analyzing the roughness parameters can signifi cantly reduce the amount of experimental research and clarify the idea of the practical implementation of the method of acoustic monitoring of the cutting process. For citation: Gimadeev M.R., Li A.A., Berkun V.O., Stelmakov V.A. Experimental study of the dynamics of the machining process by ball-end mills. Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science, 2023, vol. 25, no. 1, pp. 44–56. DOI:10.17212/1994-6309-2023-25.1-44-56. (In Russian). ______ * Corresponding author Gimadeev Mikhail R., Ph.D. (Engineering), Associate Professor Pacifi c National University, 136 Tihookeanskaya St., Khabarovsk, 680035, Russian Federation Тел.: 8 (924) 216-31-39, e-mail: 009063@pnu.edu.ru
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