Різання та інструменти в технологічних системах

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Arithmetic mean height and maximum height of the roughness profile in honing with different feeds
(Національний технічний університет "Харківський політехнічний інститут", 2023) Sztankovics, István
The achievable surface quality is an important factor even in roughing procedures; however, it is most relevant in finishing. Two commonly measured and analysed characteristics of the machined surface roughness profile are the Arithmetic Mean Height and the Maximum Height of the Roughness Profile. In this paper these parameters were studied in bore honing. Cutting experiments were carried out, where the feed rate and the applied honing tool are varied. After the evaluation of the measured 2D surface profiles, the following conclusions were drawn: the effect of the feed rate is not linear; the lowest values of the analysed roughness parameters were achieved by the application of 50 mm/rev. feed rate and a honing tool with 80 grain size and ceramic binder; the difference between the studied roughness parameters was 6.5-8.0-fold.
Alteration of the cutting force components in tangential turning
(Національний технічний університет "Харківський політехнічний інститут", 2023) Sztankovics, István; Pásztor, István T.
In the development of cutting procedure, the study of the cutting force is important to evaluate the possible loads and elastic deformations in the machining system. The unusual relative position of the cutting tool leads to a changing characteristic of the cutting force in tangential turning. Therefore, it is particularly important to study the values and ratios of the cutting force components in different setups in this finishing procedure. In this paper the depth of cut, feed, and cutting speed are changed, and the effect of these parameters are analysed on the major cutting force, feed force and passive force. The full factorial design of experiment method is applied in the selection of setup parameters and the evaluation of the results. The maximal values and the ratio of the force components were analysed by the determination of equations.
Roundness error and topography of hard turned surfaces
(Національний технічний університет "Харківський політехнічний інститут", 2023) Sultana, Jakiya; Sztankovics, István
Accuracy and topography are significant indicators of precision machined high-quality surfaces. Case hardened steel (16MnCr5) was analyzed to obtain information about the effects of technological data and the connections between the analyzed accuracy (roundness) and roughness parameters (Sa, Sz, Ssk, Sku). It was found that the feed rate has a significant influence on the roundness and the roughness parameters, and there are strong relationships between the roundness and these roughness parameter values: the correlation coefficients varied between 0.78 and 0.85.
Analysis of selected function-defining 2D surface roughness parameters in tangential turning
(Національний технічний університет "Харківський політехнічний інститут", 2023) Sztankovics, István
Among other, more frequently analysed surface topography parameters, the function-defining parameters must be analysed in different machining procedures to outline their application possibilities. These values are the core roughness, the reduced peak height, the reduced valley depth, the skewness, and the kurtosis of the roughness profiles. Tangential turning is a promising machining procedure, which can produce ground-like surfaces with twist-free properties by defined cutting edged tools. The achievable productivity is also very high. Therefore, in this paper, these roughness parameters were analysed from 2D roughness profiles measured on surfaces machined by tangential turning.