Різання та інструменти в технологічних системах
Постійне посилання на розділhttps://repository.kpi.kharkov.ua/handle/KhPI-Press/62923
Офіційний сайт http://rits.khpi.edu.ua/
У збірнику публікуються наукові статті, у яких висвітлюються актуальні питання в області механічної обробки сучасних матеріалів із застосуванням високопродуктивних технологій, нових методів та вимірювальних приладів для контролю якості оброблених поверхонь і високоефективних різальних інструментів. Висвітлюються аспекти оптимізації й математичного моделювання на різних етапах технологічного процесу.
Рік заснування: 1966. Періодичність: 2 рази на рік. ISSN 2078-7405 (Print)
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Збірник «Різання та інструменти в технологічних системах» включено до Переліку наукових фахових видань України з технічних наук до категорії «Б» згідно Наказу МОН України №409 від 17.03.2020 р.
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Документ Roughness investigation of single and double cutting marks on face milled surface(Національний технічний університет "Харківський політехнічний інститут", 2023) Nagy, Antal; Kundrak, JanosIn machining with defined cutting edge tools, in some rotational tool processes (e.g. face milling) the tool edge may scratch the surface of the workpiece one more time, depending on the cutting conditions, during one revolution of the tool. As a result, the topographies with single or double cutting marks will be different from each other. The deviation, depending on its size, can also affect the functional performance (e.g. friction conditions) of the operating surfaces. In this article, face-milled topographies created with a symmetrical setting and with single or double milling marks are compared according to the magnitude of the roughness and the degree and nature of the inhomogeneity.Документ Analysis of the effect of varying the cutting ratio on force components and surface roughness in face milling(Національний технічний університет "Харківський політехнічний інститут", 2023) Felhő, CsabaTraditional machining processes, such as face milling, still play a very important role in the production of machine parts and are the subject of ongoing research. One important area of research is the investigation of high-feed milling processes. However, due to the increased feed per tooth value fz, it is advisable to reduce the depth of cut (aₚ) in order to maintain the cutting forces at an appropriate level. In this way, the ratio of these two technological parameters, the so-called cutting ratio, changes and we can move into the range of inverse machining, where aₚ / fz < 1. In this paper, the consequences of this change is investigated on the surface roughness and the components of the cutting force, and it is discussed how the optimal cutting ratio can be found.Документ Experimental investigation of tribology-related surface topography parameters and hardness of 16MnCr5 case hardened steel(Національний технічний університет "Харківський політехнічний інститут", 2023) Nagy, NoraTribological properties are determinant in the functionality of contacting surfaces of machine elements. The wear resistance or load bearing capacity influence the lifetime of these parts. In this study tribology-related surface topography parameters (Ssk, Sbi) and the hardness of hard turned surfaces are analyzed after hardness and topography measurements. Correlation coefficients were calculated for their relationships. It was found that the cutting parameters affect the wear resistance and the hardness in the opposite direction.Документ Investigation of face milled surface topography on C45 workpiece assuming movement at 30° and 60° to feed direction(Національний технічний університет "Харківський політехнічний інститут", 2023) Nagy, Antal; Kundrak, JanosWhen surfaces with anisotropic texture are moved in different directions related to their assembled counterpart during operation, the friction conditions change, as they are determined by the lay of the topographies. In the article, contributing to the exploration of this characteristic, we analyze the inhomogeneity of the topography on a face milled plane surface with a symmetrical setting in sections at an angle of 30° or 60° to the feed direction. Roughness profiles are recorded at 13 pointslocated equidistantly from each other in each measurement plane, and the degree and distribution of the roughness deviations are determined on the surface.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 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.