OBRABOTKAMETALLOV MATERIAL SCIENCE Том 23 № 3 2021 EQUIPMEN . INSTRUM TS Vol. 6 No. 2 2024 of tool vibrations in radial and longitudinal directions as a diagnostic feature, as it has a greater influence on the formation of irregularities in the surface of the workpiece. Thus, the use of a simulation model reduces the number of real experiments in the search for optimal cutting modes according to the criteria of maximum tool wear resistance and preservation of the quality of the machined surface. Conclusion Experiments and numerical modeling have shown that the quality of the workpiece surface produced by cutting is influenced by the tool feed, together with the depth of cut. The characteristics of the vibration sequences measured during the cutting process change: as the tool feed increases, the vibration energy in the longitudinal direction increases, which according to (4) also affects the tool motion in the radial direction. Finally, the analysis of the adequacy of the calculated roughness of the workpiece surface on the basis of numerical simulation and experimentally measured roughness allows us to conclude that it is possible to use the considered technique as a basis for evaluating the influence of the dynamic characteristics of the cutting process on the roughness of the workpiece surface during turning. The identified parameters of the force model are suitable for modeling the processes of machining the stainless steel A508-3 (0.1 % C-Mn-2 % Ni-Mo-V in Russia) workpiece with coated carbide inserts HS123 (79 % WC-15 % TiC-6 % Co in Russia) in the case of tool wear on the main cutting face not exceeding 0.1 mm. The presented parameters of the force model are valid for perturbed motion of the tool with the amplitude of vibration accelerations not exceeding that shown in fig. 5, b. In case of a deviation from the specified range or a change in the initial data of modelling, it is necessary to carry out all stages of the stated methodology for correcting the parameters of the model. Thus, the applied efficiency of using simulation studying will increase in case of forming a vibration database of a certain type of machine tool enterprise, determined by the nomenclature of parts, workpiece and tool materials, as well as its geometry. The given example of simulation studying, which allows to determine the most optimal cutting modes according to the criterion of maximum productivity, taking into account the required surface quality of the part, gives an idea of how the proposed analytical model of the cutting process dynamics, refined by experimental data, can predict the surface roughness depending on the cutting modes, thus reducing the labour input of the production for conducting exploratory experiments. Thus, the presented results lead to the beginning of a deeper experimental-theoretical study of the mechanisms of mapping of tool deformation displacements in the part geometry. References 1. Makarov A.D. Optimizatsiya protsessov rezaniya [Optimization of cutting processes]. Moscow, Mashinostroenie Publ., 1976. 278 p. 2. Tlusty J., Polacek A., Danek C., Spacek J. Selbsterregte Schwingungen an Werkzeugmaschinen. Berlin, VerlagTechnik, 1962. 340 p. 3. Tabenkin A.N., Tarasov S.B., Stepanov S.N. Sherokhovatost’, volnistost’, profil’. Mezhdunarodnyi opyt [Roughness, waviness, profile. International experience]. St. Petersburg, Politekhnicheskii universitet Publ., 2007. 133 p. 4. Al-Ahmari A.M.A. Mathematical model for determining machining parameters in multipass turning operations with constraints. International Journal of Production Research, 2001, vol. 39 (15), pp. 3367–3376. DOI: 10.1080/00207540110052562. 5. Suslov A.G. Kachestvo poverkhnostnogo sloya detalei mashin [The quality of the surface layer of machine parts]. Moscow, Mashinostroenie Publ., 2000. 320 p. 6. Suslov A.G. Tekhnologicheskoe obespechenie parametrov sostoyaniya poverkhnostnogo sloya detalei [Technological support of the parameters of the state of the surface layer of the part]. Moscow, Mashinostroenie Publ., 1987. 206 p. 7. Demkin N.B. Kachestvo poverkhnosti i kontakt detalei mashin [Surface quality and contact of machine parts]. Moscow, Mashinostroenie Publ., 1981. 244 p.
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