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Документ Analytical analysis of the theoretical surface roughness in the case of burnishing of cylindrical workpiece(Національний технічний університет "Харківський політехнічний інститут", 2023) Ferencsik, ViktoriaIn the last decade, ensuring the highest possible surface quality of manufactured parts has been given a major priority, so more and more emphasis is being placed on the examination and development of finishing treatments that can effectively ensure increasingly stringent surface roughness. For this purpose, diamond burnishing - which is a widely used cold plastic technology - can be used productively as it can improve the surface roughness of the material. But even though due to the development of engineering technology, new possibilities and methods are constantly being developed to examine individual material structure changes, the ability to plan the surface roughness is very difficult. This paper focused on the determination of theoretical roughness to establish a mathematical model that can predict and analyse the relationship between experimental process parameters and surface roughness parameters. To validate the model, real experiments were performed, where the surface roughness were measured before and after the application of burnishing process on low alloyed aluminium shaft pieces.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 Examination of 3D surface topography of diamond burnished C45 workpieces(Національний технічний університет "Харківський політехнічний інститут", 2019) Ferencsik, Viktoria; Varga, GyulaNowadays cold working operations like rolling, burnishing are important finishing methods. In this paper the diamond burnishing of external cylindrical surfaces are studied. The principle of this process is that a pressing tool, which goes along the surface of the workpiece with linear motion having given parameters (e.g. feed) while the workpiece is rotating. Using of diamond burnishing has many preferences: surface roughness of the workpiece is improving, hardness of the surface is increasing while it’s micro-structure is also improving. Fatigue strength is increasing significantly due to the compressive residual stress in the subsurface area causing by burnishing. The aim of this study was to examine the influence of different burnishing parameters, such as burnishing speed, feed and force with the using of two different kinematic viscosity oil. For plan and execute the experiments we used the Taguchy type full factorial experimental design method by which empirical formulas can be created easily. The measurement of the surface roughness was executed with Altisurf 520 3D measuring equipment at the Institute of Manufacturing Science. The measured results were evaluated by the comparison of a special correlation formula to determine the optimal combination level of the different parameters in the given interval.Документ Examination of residual stresses on diamond burnished cylindrical surfaces(НТУ "ХПИ", 2017) Varga, Gyula; Ferencsik, ViktoriaCold plastic finish manufacturing methods such as surface rolling, burnishing and surface hardening with shot peening play important role in the lifetime increasing manufacturing as compressive residual stress remains in near surface layers of the workpiece. This paper deals with examination of changing of residual stress caused by burnishing using diamond tipped tools. The diamond burnishing executed on outer cylindrical surfaces is a finishing manufacturing operation which results high accuracy and fine surface texture. The aim of the examinations was to determine how the burnishing speed, feed rate and burnishing force has affect on the residual stresses in case of diamond burnishing of low alloyed aluminium shafts. The Taguchi type Factorial experiment design was used for planning of experiments. The measurement of residual stresses was performed by an X-ray diffraction method. The evaluation of measured results was done by a specially specified ratio to determine the parameter set which results the best residual stress values in between the given range of technological parameters.Документ Examination of the change in surface roughness of burnished low alloyed aluminium external cylindrical pieces(Національний технічний університет "Харківський політехнічний інститут", 2019) Ferencsik, Viktoria; Varga, GyulaThe life and reliability of machine components or elements are affected greatly by the surface integrity. Machined surfaces by conventional processes such as turning and milling have inherent irregularities and defects like tool marks and scratches that cause energy dissipation (friction) and surface damage (wear). Ball burnishing has proved to be a highly effective mechanical finishing process of industrial workpieces because of the excellent surface roughness and fatigue performance that induces in treated components. This paper focuses on the examination of the influence of different burnishing parameters, such as number of passes (i), feed rate (f) and burnishing force (F). For plan and execute the experiments we use full factorial experimental design method by which empirical formulas can be created easily. The measurement of the surface roughness was executed with Altisurf 520 3D measuring equipment at the Institute of Manufacturing Science. The measured results were evaluated by the comparison of a special correlation formula to determine the optimal combination level of the different parameters in the given interval.Документ Experimental examination of surface micro-hardness improvement ratio in burnishing of external cylindrical workpieces(Національний технічний університет "Харківський політехнічний інститут", 2020) Varga, Gyula; Ferencsik, ViktoriaThis paper deals with the experimental examination of surface micro-hardness improvement ratio in burnishing of external cylindrical workpieces. The material of the examined workpiece was AISI 304 austenitic stainless steel. In our experiments, we investigated the sliding frictional burnishing of an outer cylindrical surface when the burnishing tool had a diamond material-grade spherical tip. Using the full factorial experimental design technique, we aimed to determine how the changes in burnishing parameters, i.e., burnishing speed, burnishing feed, and burnishing force effect on the changes of surface micro-hardness and surface micro-hardness improvement ratio. Based on examinations, the best burnishing parameter combination could be selected.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.Документ Investigation of shape correctness of diamond burnished low alloyed aluminium components(Національний технічний університет "Харківський політехнічний інститут", 2020) Ferencsik, Viktoria; Varga, GyulaConventional machining methods such as turning or milling can cause surface irregularities, defects such as tool traces and scratches, resulting in energy dissipation (friction) and surface damage (wear). In contrast, the environmentally friendly chipless burnishing process clearly improves the integrity of the machined surface and largely considered in industrial cases in order to restructure surface characteristics. In this paper influence of different burnishing parameters, such as burnishing speed (v), feed rate (f) and burnishing force (F) are examined. Based on theoretical considerations, we use full factorial experimental design method to determine the optimal combination level of the different parameters in the given interval. The measurement of the shape correctness was executed with Taylor Hobson Talyrond 365 measuring equipment at the Institute of Manufacturing Science.