Видання НТУ "ХПІ"
Постійне посилання на розділhttps://repository.kpi.kharkov.ua/handle/KhPI-Press/62886
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Документ Comparison of cutting tool geometries based on cutting forces and roughness of hard turned surfaces(Національний технічний університет "Харківський політехнічний інститут", 2024) Molnár, Viktor; Szabo, GergelySurface quality and energy consumption are two widely studied topics of hard machining. Due to the increasing need of companies for new, more efficient materials, tools and procedures, their manufacturers or suppliers have to deliver innovative solutions from time to time. In this study the latest development of a hard turning insert manufacturer is used in comprehensive machining experiments to show how the new tool (a wiper insert) behaves compared to its standard counterpart. Based on surface roughness and machining force measurement and analysis, this efficiency is proved by quantitative results: the wiper geometry ensures significantly better surface quality, while the energy consumption of the used machine tool is considerably lower. У токарній обробці загартованих сталей ріжучі інструменти постійно розробляються їх виробниками, і широкий спектр застосування охоплюється різними рішеннями, що стосуються інструментальних матеріалів або геометрії. У цьому дослідженні представлені результати експерименту з механічної обробки. Вимірювали та аналізували шорсткість оброблюваних циліндричних поверхонь та зусилля обробки. Механічна обробка здійснювалася стандартною вставкою, а потім її аналогом після доводки. Мета полягала в тому, щоб визначити,чи забезпечує вставка після доводкименше енергоспоживання за рахунок менших сил різання та сприятливу якість поверхні за рахунок нижчих значень шорсткості поверхні.Документ Analyzing surface integrity elements of hard turned 16MnCr5 steel(Національний технічний університет "Харківський політехнічний інститут", 2023) Molnar, ViktorSurface integrity plays a determinant role in the functional requirement of precision machined parts. In the automotive industry billions of components are manufactured by using case hardened steels. In this study some surface integrity elements, such as surface roughness or residual stress are analyzed based on systematic machining experimental plan to optimize the applied cutting parameters. Recommendations are made for these parameters based on the measurement data and some widely used functional requirements.Документ Analysis of the Sbi and Svi functional indices in hard machining(Національний технічний університет "Харківський політехнічний інститут", 2022) Molnar, ViktorThe functional requirements of precision machined parts can be expressed among others by topography parameters. In the automotive industry there is an increased need for the application of high-accuracy quantifying parameters. In this study wear resistance and the fluid retention ability-related 3D surface texture parameters are analyzed based on hard turning and grinding experiments. The less frequently applied functional parameters (Sbi and Svi) are compared to the high-accuracy volume parameters (Vmp and Vvv) to obtain information about the reliability of the former ones. It was found that the correlation between the two types of parameters are quite weak.Документ Wear resistance of hard turned surfaces(Національний технічний університет "Харківський політехнічний інститут", 2022) Molnar, ViktorThe quality of working surfaces plays an important role in automotive industrial components. One of the main characteristics of such surfaces is their wear resistance. In this study external cylindrical surfaces were analyzed. A Design ofExperiment methodology was applied and hard turning experiments were carried out to analyze the effects of the cutting parameters on the 3D surface roughness values of reduced peak height, skewness and kurtosis. The study confirmed earlier findings that at lower feed the wear resistance is higher based on the analyzed roughness parameters. The cutting speed and the depth-of-cut do not influence these parameter values significantly.Документ Decision support method for the applicability of hard turning(Національний технічний університет "Харківський політехнічний інститут", 2022) Kundrak, Janos; Deszpoth, Istvan; Molnar, ViktorIn this study the applicability of hard turning is analyzed in the case of disc-shaped parts (gear wheels). The relevance of such parts has been increasing in the automotive industry; therefore, the efficiency of large series or mass production has high priority. The novelty of this paper is the collection of factors that has to be considered in preparation for applicability decisions of hard turning in order to ensure efficient machining. This can be the basis of the IT support, i.e. an automation solution for technologists. The introduced process is elaborated on the basis of theoretical considerations and production shop-floor experience.