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Документ Уточнення розрахунку ефективності роботи ДКС в умовах фактичних термоградієнтів та сучасних покриттів НКТ(Національна акціонерна компанія "Нафтогаз України", 2014) Фик, Михайло ІллічУ статті висвітлено результати промислового та теоретичного експерименту з удосконаленою прикладною алгоритмічною аналітикою розрахунку ефективності ДКС. Доведено важливість використання комплексних політехнологій інтенсифікації видобутку із свердловин на пізній стадії експлуатації.Документ Methodology for the development of a model for managing the quality and productivity of shaping when processing hardened coarse-modular gears(ФОП Тарасенко В. П., 2020) Kovalov, V.; Vasylchenko, Y.; Shapovalov, M.; Antsyferova, O.; Kamchatna-Stepanova, K.Документ Analyzing the effect of the tool pass number and the direction of sliding burnishing on surface roughness(Національний технічний університет "Харківський політехнічний інститут", 2022) Nagy, Antal; Varga, GyulaNowadays, the concern of environmental protection is becoming more and more important in production as well. They often contribute to this by reducing or eliminating the amount of coolants and lubricants, or by using alternative machining methods. One of them is burnishing, which makes a positive effect on surface integrity, while reduces the environmental load. In this paper we examined the change in surface roughness achieved by burnishing after turning on a corrosion-resistant steel workpiece, where the number of burnishing passes and burnishing direction were changed. The results showed increased smoothness, bearing capacity and dimensional stability by increasing the number of passes from 1 to 2, however, the 3 times repetition did not show any additional favorable improvement on the surfaces. In case of the forward-backward-forward burnishing directions, further chipping occurred, in other cases the effect of the directions was negligible on the amplitude roughness parameters, but considerable on the parameters characterizing the roughness peak. The greatest improvement was achieved with the backward-forward settings.Документ The effect of burnishing process on skewness and kurtosis of the scale limited surface(Національний технічний університет "Харківський політехнічний інститут", 2022) Ferencsik, Viktoria; Varga, GyulaIn this paper roughness examination and analysis on burnished low alloyed aluminium surfaces are reported, highlighting 2 parameters from the vertical deviations of the roughness profile from the mean line. From the input parameters of the burnishing process, the effect of burnishing force, feed rate, speed and number of passes are investigated. Measurements of the surface topography – before and after burnishing – are conducted on an Altisurf 520 3D measuring device. The generated and calculated values of the machined surface roughness are analysed in detail with the drawing of the conclusions as well.Документ Analysis of the change in roughness on a face-milled surface measured every 45° direction to the feed(Національний технічний університет "Харківський політехнічний інститут", 2021) Nagy, Antal; Kundrak, JanosIn this article, we analyze the difference (inhomogeneity) of the roughness values measured on a nonalloy carbon steel surface milled with a parallelogram-shaped (κr = 90°) insert as a function of the the tool movement direction and the relative position of the examining points on the workpiece surface. The characteristic distribution of roughness and the magnitude of the deviations were examined by measuring at selected points along several planes on a surface characterized by the movement conditions of the workpiece and the symmetrically arranged tool perpendicular to the machined surface, which formed double milling marks. The selected points mark the lines with specified inclinations with respect to the feed direction, and their measured values were compared. In these directions, the magnitude of the difference in roughness measures was obtained.Документ Gas well production enhancement on the application of innovative structural and thermal insulation nano coatings(Харківський національний університет ім. В. Н. Каразіна, 2016) Fyk, M. I.; Palis, Stefan; Kovalchuk, Ju. I.Наведено результати розробки спрощеної прикладної математичної моделі неізотермічного свердловинного ліфтингу природного газу в умовах розробки виснаженого газоконденсатного родовища. Спрощене моделювання базувалося на відомих рівняннях Дарсі, Бернуллі, Адамова, Веймаута, Шухова і Рейнольдса. Базові рівняння бралися в нелінійній формі з перевіреними в промисловій практиці спрощеннями, що значно скоротило час об числень і дало можливість вирішувати завдання в загальній постановці. При цьому враховували також застосування трьох основних покриттів: гладкі, теплоізолюючі і турбулізуючі. Велика частина параметрів і вихідних даних типові для родовищ України з середньою величиною запасів. Представлено перевірку теоретичних експериментів ключових параметрів моделі і ефектів від застосування різних спеціальних сучасних покриттів труб. Модель побудована на базі емпіричних формул, перевірених промислової практикою. Показано, що можливий підбір комбінацій спеціальних властивостей покриттів для отримання максимального економічного ефекту в натуральних одиницях сирої продукції, особливо, на етапі останньої стадії компресорної розробки родовища.Документ Influence of the geometric characteristics of the discontinuous profile working surfaces of abrasive wheels for precision and temperature when grinding(Національний технічний університет "Харківський політехнічний інститут", 2021) Yakimov, A.; Bovnegra, L.; Tonkonogyi, V.; Vaysman, V. O.; Strelbitskyi, V.; Sinko, I.Grinding is the most common finishing method for hardened steel parts. Grinding is accompanied by a large heat release in the cutting area, under the influence of which structural changes appear in the thin surface of the processed parts, tensile stress and even microcracks, which significantly reduce the operational reliability of machines that include these parts. The use of abrasive wheels with an intermittent working surface makes it possible to reduce the temperature in the area of contact of abrasive grains with the material of the workpiece and, as a consequence, stabilize the quality of the surface layer of the workpieces. High-frequency vibrations in the elastic system of the machine, accompanying the work of an intermittent wheel, are a positive factor that reduces the energy consumption of the grinding process. However, under certain conditions of dynamic interaction of the tool with the workpiece, parametric resonance may occur, which worsens the geometric and physical-mechanical parameters of the quality of the surface layer of the processed part. The aim of the work is to realize the possibility of predicting the quality parameters of the surface layer of parts during intermittent grinding by studying the influence of the design features of the macrotopography of the working surface of abrasive wheels and processing modes on the nature of the dynamic interaction of the tool with the workpiece and the heat stress in the cutting area. It was found that the parametric vibrations of the elastic system of the machine tool can be shifted to a more stable area, due to an increase in the number of interruptions of the working surface of the abrasive whee l with a constant ratio of the length of the protrusions and depressions. The increase in the number of breaks on the wheel also contributes to a decrease in temperature in the cutting area. It was found that to maintain the stable operation of the elastic system of the machine, it is necessary to reduce the number of cavities on the grinding wheel with an increase in the cutting speed. However, both of these actions are accompanied by an increase in the heat stress of the grinding process. It has been experimentally established that for ordinary (pendulum) grinding, it is possible to achieve an increase in processing productivity by increasing the speed of the longitudinal movement of the table.Документ Investigation of the effect of areal roughness measurement length on face milled surface topographies(Національний технічний університет "Харківський політехнічний інститут", 2021) Nagy, AntalSurface roughness is of great importance in the manufacturing industry, as it affects surfaces’ tribological properties (wear, friction, lubrication, etc.), corrosion resistance, fatigue strength and appearance. Areal roughness measurement, which provides a more comprehensive characterization of surfaces, is becoming increasingly popular, but systematic studies are still lacking, so measurements are often analyzed differently. In this paper, the effect of the measurement length is analyzed in the main measurement direction on areal roughness of face milled surface topographies, which were measured with a confocal chromatic sensor.Документ Finish machining of the cutting inserts from cubic borine nitride BL group composite(Національний технічний університет "Харківський політехнічний інститут", 2021) Chumak, A.; Klimenko, S.; Klimenko, S.; Manokhin, A.; Naydenko, A.; Kopeikina, M.; Burikin, V.; Bondarenko, M.; Burlakov, V.Finishing methods of machining of superhard composite’s working elements based on cubic boron nitride BL group are considered. The results of the microgeometry formation research of the cutting inserts’ surfaces during machining by free powders of synthetic diamond, grinding wheels and a method of vibro-magnetic-abrasive machining (VMAM) are presented. It is shown that during VMAM the friction between the inserts’ surfaces and the abrasive particles result in microremoval of the material, which reduces the roughness of the cutting inserts’ surfaces. It is established that additional fine grinding with 14/10 mkm synthetic diamond powder provides the absence of microgeometry defects of the cutting inserts’ surfaces left by pre-machining. The result of high-quality rounding of cutting edges and the formation of surfaces of cutting inserts with less roughness is an increase in strength and wear resistance of metal-cutting tools in high-speed machining under conditions of significant loads.Документ Fe investigation of surface burnishing technology abstract(Національний технічний університет "Харківський політехнічний інститут", 2020) Ferencsik, Viktoria; Gal, V.This paper investigates the finite element analysis of cold forming diamond burnishing process on aluminium alloy, where the input parameters are force, feed rate and speed, as an output parameter the changing of surface roughness is analysed. This lifetime increasing process effectively reduces roughness, improves shape correctness, and increases the hardness of the sub-surface area. Machining simulation of the turned surface before burnishing is based on the real model, corresponding to the measured values, by using DEFORM-2D software in order to validate the improvement of surface quality with numerical values too.