The influence of the shapes and sizes of microroughnesses on the creation of favorable conditions for micro-cutting of antifriction material by modeling the contact interaction of microroughnesses with the treated surface during the finishing antifriction non-abrasive treatment (FANT) is studied in the work. It is shown that the formation of the anti-friction coating FANT depends on the conditions of contact interaction of the tool with the treated surface, and the shape and size of the microroughness determine the quality of the resulting coating. In the study of FANT at the stage of micro-cutting, a similarity and dimension theory method was used, according to which cutters made of gray cast iron SCh20 were made, the geometry of the cutting part of which simulated a separate microroughness of the surface of the workpiece with different front cutting angles. As a contacting surface and coating material used brass L63. The micro cutting process is considered as a low-temperature process of deep plastic deformations with a predominance of a simple shear of the processed material in the chip formation zone according to the free orthogonal cutting scheme. A scheme for the interaction of microroughness with the treated surface is constructed with the friction-mechanical method FANT. It has been established that the cutting blade of a cast-iron micro-cutter wears out intensively in the process of interacting with a brass surface, and the process of changing the geometry of the tip of the cutter occurs in accordance with the principle of adaptability of the entire system of the cutter - the part according to which the minimum of micro-cutting energy is realized. It is proved that with a decrease in the cutting front angle, the blunting radius of the cutting edge increases, and the actual cutting depth and the volume of microchips decrease. Reducing the cutting front angle contributes to the strain hardening of the rubbed material, which reduces the chip formation process of the antifriction material. In order to intensify micro-cutting and obtain a high-quality FANT coating, single microroughnesses of the treated surface should have a cutting front angle γ ≥ 0°. The obtained experimental data and simulation results made it possible to present contact interaction diagrams of the tool with the surface being machined for various angles during FANT at the stage of microcuts, and also to establish the basic laws of their parameters. An analysis of the characteristic microcutting patterns in FANT by the friction-mechanical method made it possible to recommend the parameters of the initial surface microrelief, thereby creating favorable conditions for micro-cutting of the antifriction material and to improve the quality of the formation of the antifriction coating.
[1] V. I. Balabanov, V. J. Bolgov, S. A. Ishhenko, “Nanesenie treniem nanorazmernyh antifrikcionnyh pokrytij na detail” [“Friction application of nanoscale antifriction coatings on parts”], Nanotehnologii, ekologiya, proizvodstvo [Nanotechnology, ecology, production], vol. 1 (3), pp. 104–107, 2010. [in Russian].
[2] A. V. Ragutkin, M. I. Sidorov, M. E. Stavrovskij, “Some Aspects of Antifriction Coatings Application Efficiency by Means of Finishing Nonabrasive Antifriction Treatment”, Journal of Mining Institute, vol. 236, pp. 239–244, 2019. https://doi.org/10.31897/pmi.2019.2.239
[3] D. N. Garkunov, “Finishnaja antifriktsionnaja bezabrazivnaja obrabotka (FABO) poverhnostej trenija detalej” [“Finishing anti-friction non-abrasive treatment (FANT) of friction surfaces of parts”], RVM (Remont. Vosstanovlenie. Modernizatsija) [RRM (Repair. Restoration. Modernization)], vol. 3, pp. 36–41, 2009. [in Russian].
[4] A. M. Bugaev, “FABO kak tehnologicheskij metod povysheniya resursa DVS” [“FANT as a technological method of increasing the internal combustion engine resource”], Mezhdunarodnyj nauchno-issledovatelskij zhurnal [International Research Journal], vol. 1 (55), no. 4, pp. 36–38. [in Russian].
[5] V. A. Pogonyshev, M. V. Panov, “Teoreticheskie i eksperimental'nye osnovy povyshenija iznosostojkosti detalej mashin” [“Theoretical and experimental fundamentals of increasing the wear resistance of machine parts”], Mehanika i fizika protsessov na poverhnosti i v kontakte tverdyh tel, detalej tehnologicheskogo i energeticheskogo oborudovanija [Mechanics and physics of processes on the surface and in contact of solids, parts of technological and power equipment], vol. 4, pp. 78–84, 2011. [in Russian].
[6] A. L. Bersudskij, “Mehanizm formirovanija antifrikcionnyh pokrytij pri uprochnjajushhej obrabotke” [“The mechanism of formation of antifriction coatings during hardening treatment”], Vestnik Samarskogo ajerokosmicheskogo universiteta imeni akademika S. P. Koroleva [Bulletin of the Samara Aerospace University named after academician S. P. Korolev], vol. 2 (10), pp. 81–84, 2006. [in Russian].
[7] Gottlib Polcer, “Osnovy frikcionnogo naneseniya pokrytiya v usloviyah selektivnoj peredachi” [“Basics of friction application of coating in conditions of selective transfer”], RVM (Remont. Vosstanovlenie. Modernizatsija) [RRM (Repair. Restoration. Modernization)], vol. 10, pp. 23–28, 2010. [in Russian].
[8] E. S. Karakozov, R. I. Mustafaev, N. V. Melnikov, “Sovremennoe sostoyanie svarki treniem (Obzor)” [“Current state of friction welding (Overview)”], Svarochnoe proizvodstvo [Welding production], vol. 8, pp. 2–5, 1989. [in Russian].
[9] I. V. Shepelenko, E. K. Posviatenko, V. V. Cherkun, “The mechanism of formation of anti-friction coatings by employing friction-mechanical method”, Problems of Tribology, vol. 1, no. 1/91, pp. 35–39, 2019. https://doi.org/10.31891/2079-1372-2019-91-1-35-39
[10] I. V. Shepelenko, Ya. B. Nemyrovskyi, Yu. A. Tsekhanov, E. K. Posviatenko, “Modeling of contact interaction of micro roughness at FANP”, in Proc. 1th International scientific and technical conference «Prospects for the development of mechanical engineering and transport – 2019», Vinnytsia, Ukraine, May 13–15, 2019, pp. 218−219.
[11] L. I. Sedov, Metody podobija i razmernosti v mehanike [Similarity and dimension methods in mechanics]. Moscow, Russia: Nauka Publ., 1987. [in Russian].