OBRABOTKAMETALLOV Vol. 25 No. 2 2023 42 EQUIPMENT. INSTRUMENTS Theoretical study of the curvature of the treated surface during oblique milling with prefabricated milling cutters Vadim Kuts a, *, Sergey Chevychelov b Southwest State University, 94, 50 let Oktyabrya str., Kursk, 305040, Russian Federation a https://orcid.org/0000-0002-3244-1359, kuc-vadim@yandex.ru, b https://orcid.org/0009-0006-8958-2191, tschsa@yandex.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. 32–44 ISSN: 1994-6309 (print) / 2541-819X (online) DOI: 10.17212/1994-6309-2023-25.2-32-44 ART I CLE I NFO Article history: Received: 13 March 2023 Revised: 29 March 2023 Accepted: 15 April 2023 Available online: 15 June 2023 Keywords: Form-generating method Interlocking side mill Oblique milling Surface curvature The main radii of curvature Acknowledgements Research were partially conducted at core facility “Structure, mechanical and physical properties of materials”. ABSTRACT Introduction. The paper discusses the methods of processing large parts having curved convex surfaces with a rectilinear guide on multi-coordinate CNC machining centers using the touch method with a discrete motion of the tool feed along the profi le of the part. It is shown that the main disadvantages of this method are lower productivity, which is due to the presence of discrete tool motions between cycles of its translation mode, where the value of discrete tool motion for a given processing accuracy depends on the curvature of the surface being processed. To improve processing performance, it is proposed to use prefabricated disc cutters equipped with replaceable polyhedral inserts (RPI) with rectilinear cutting edges. Its installation in the cutter body with non-zero angles of inclination of the main cutting edge, in combination with an additional rotation of the cutter, during processing, along the direction of the translational feed movement, allows you to obtain a concave surface and ensure a tighter fi t of the producing surface of the tool and the machined surface of the part. The aim of the work is to reduce the error of approximation of the profi le when it is processed using the touch method with discrete motion of prefabricated disc cutters along the profi le and, consequently, to ensure workpiece the possibility of increasing the step of tool movement along the profi le being formed to improve processing performance. Research methods: geometrical theory of designing metal-cutting tools. Results and discussion. The regularities established in the work made it possible to create a method for determining the angle of inclination of the main cutting edge of the RPI milling cutter and the angles of rotation of the milling cutter along the direction of translational feed movement during line-by-line processing of extended sections of parts with a curved profi le on multi-coordinate CNC machines by turning the milling cutter to ensure the best fi t of its producing surface to the surface being processed at the point of its contact, to reduce the approximation error processed profi le and improve processing performance, due to the possibility of increasing the tool movement step. For citation: Kuts V.V, Chevychelov S.A. Theoretical study of the curvature of the treated surface during oblique milling with prefabricated milling cutters. Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science, 2023, vol. 25, no. 2, pp. 32–44. DOI: 10.17212/1994-6309-2023-25.2-32-44. (In Russian). ______ * Corresponding author Kuts Vadim V., D.Sc. (Engineering), Associate Professor Southwest State University, 94, 50 let Oktyabrya str., 305040, Kursk, Russian Federation Tel.: 8 (903) 639-94-01, e-mail: kuc-vadim@yandex.ru References 1. Wei P.M. Povyshenie eff ektivnosti konturnoi obrabotki na stankakh s ChPU putem korrektsii traektorii i rezhimov rezaniya. Avtoref. kand. tekhn. nauk [Improving the effi ciency of contour machining on CNC machines by correcting the trajectory and cutting modes. Author’s abstract of PhD eng. sci. diss.]. Moscow, 2014. 22 p. 2. Petrakov Y., Shuplietsov D. Contour milling programming technology for virtual basing on a CNC machine. Eastern-European Journal of Enterprise Technologies, 2019, vol. 2, no. 1 (98), pp. 54–60. DOI: 10.15587/17294061.2019.162673. 3. Petrakov Y., Korenkov V., Myhovych A. Technology for programming contour milling on a CNC machine. Eastern-European Journal of Enterprise Technologies, 2022, vol. 2, pp. 55–61. DOI: 10.15587/17294061.2022.255389.
RkJQdWJsaXNoZXIy MTk0ODM1