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Документ Defects of castings. Part 1(2021) Kostyk, K. O.Methodical instructions are intended for students of the specialty 131 Applied Mechanics of the Bachelor's level. Laboratory works are small study researches that allow students to get acquainted in more detail with the main defects of castings of the first and second groups and methods of their definition, to study features of formation of defects from geometry and surface defects. Each laboratory work contains a list of materials, a summary of theoretical information and research methods, the order of execution, which helps students to correctly and consciously perform the practical part of the work and draw conclusions. The purpose of the methodological instructions is to help students to study more deeply the topic "Inconsistency in geometry, surface defects of castings" in the discipline "Foundry alloys and smelting technologies", to develop skills of independent work and scientific research. In addition to the main goal, the methodological instructions are aimed at developing interest in scientific activity, familiarity with complex and varied experimental techniques, and will help students in the future in completing their thesis.Документ Increase of operational properties of tools and machine parts nitriding the powder mixture(2019) Kostyk, V. O.; Kostyk, K. O.; Kovalov, V. D.; Turmanidze, R.; Dašić, P.The effect of diffusion layers and alloying elements on surface hardness, microcoarseness, and wear resistance of hardened tool steels in a nitrogen-containing medium is Studied. The experiments showed that nitriding in the powder mixture strengthens the surface layers in 2–3.5 times without reducing the volume strength of the material in question, which contributes to the preservation of high structural strength of tools and machine parts. It was found that nitriding in the dispersed powder mixture provides increased wear resistance of 1.3–2.5 times of steel, which can significantly improve the reliability and durability of products. Mathematical models of wear resistance of the investigated steels after the proposed hardening technology of nitriding are obtained.Документ The influence of the driving speed and vertical acceleration of the mobile machine on the change of soil packing(Ukrainian State University of Railway Transport, 2018) Artiomov, M. P.; Klets, D. M.; Boldovskyi, V. M.; Makovetskyi, A. V.; Kostyk, K. O.The article deals with the processes of changing the vertical forces acting on the propulsion of mobile machines, causing soil compaction when changing the driving speed and vertical accelerations of a mobile machine moving on a deformable soil. The influence of parameters and characteristics of the running gear system of the wheeled tractor, as well as the traction load on the value of vertical accelerations when moving along the soil, is determined. The dependence of the influence of vertical accelerations on the dynamic loads on the axle of the tractor front and rear axles is determined. The dependence of the soil density variation caused by the action of dynamic loads from the propulsion of the tractor front and rear axles has been determined.Документ Computer-integrated design of cast parts on the criterion of performance on the example of the turbine wheel turbocharger(2019) Akimov, O. V.; Soloshenko, V.; Kostyk, K. O.In this work the method of computer modeling solved the problem of reducing the efficiency of the turbocharger associated with the mismatch of the geometry of the resulting casting petal turbine technology geometry, calculated gas-dynamic calculations. Computer methods was calculated crystallization of the casting and hardening of the stencil. Computer simulation showed that there is a significant change in the geometry of the turbine blade, which adversely affected the geometry of the resulting casting. Was proposed and solved by the method of computer simulation of "reverse" task of the task of such a geometry of the mold, the solidification of the stencil in water and its deformation led to a (given) geometry of the resulting casting of the turbine of the turbocharger. The solution of this problem by the method of computer modeling allowed to reduce the production defect on the discrepancy of the turbine blade geometry of the turbocharger by 90 %.