Перегляд за Автор "Kundrák, J."
Зараз показуємо 1 - 6 з 6
Результатів на сторінці
Налаштування сортування
Документ Applicability of waterjet cutting for different machining operations(НТУ "ХПИ", 2011) Kun-Bodnár, K.; Kundrák, J.Today the waterjet is unparalleled in many aspects of cutting and has changed the way of production in the case of many products. The abrasive waterjet (AWJ) may be used for flexible machine tools, capable of multiple operations including cutting, milling, turning and drilling in one setup, has been demonstrated in practice. In the following sections the alternative AWJ operations milling, turning will be discussed in more detail. Because of its excellent properties waterjet has a good chance to be applied as a cutting method.Документ The efficiency of combined machinings(НТУ "ХПІ", 2012) Kundrák, J.; Gyáni, K.; Deszpoth, I.This paper analyses the efficiency of the finish process applied in machining of hard surfaces, completed by grinding, hard turning and also by the combination of these two procedures, on the basis of time consumption.Документ Material removal characteristics in rotational and tangential turning(НТУ "ХПІ", 2012) Kundrák, J.; Gyáni, K.; Deszpoth, I.; Sztankovics, I.Rotational and tangential turnings are two special variants of hard turning. They can eliminate a disadvantageous characteristic of ordinary hard turning, namely, the generation of periodical topography. This study reveals common and different features of both rotational method and the long-known tangential turning method. Common features make the complex chip removal mechanism of rotational turning easier to understand. The calculation of chip thickness and width becomes simpler. However, while the cutting technical parameters can be drawn on planar surfaces in a tangential method, these parameters obtain a 3D spatial form in rotational turning due to the helical edge. The extremely high productivity of rotational turning and the kinematical relations of the machining system are illustrated by several examples. Both methods are supplementary solutions because their extensive use requires expensive tools, which result in economic problems.Документ Precision hard turning of external cylindrical surfaces by rotation procedure(НТУ "ХПИ", 2011) Kundrák, J.; Gyáni, K.; DeszpothThe accuracy of hard turning, the roughness parameters of the turned surfaces are equal to that of grinding or even better. However, the surface topography shows significant divergence. Retaining the extraordinary economic advantages of hard turning, a new version of this procedure has been developed – the rotation turning – which eliminates the deficiencies of the surface topography that cause operation disturbances.Документ Research on coherences between the residual stresses and tool rake angle by hard turning(НТУ "ХПІ", 2012) Kundrák, J.; Gyáni, K.; Szabó, G.A broad base of researchers are concerned in studying chip removal by hard turning. The reason for that is the most of the accurate selection of the cutting conditions to be able to exploit the advantages of hard turning. Among the parameters influencing the material removal, the geometry and edge formation of the cutting tool play a decisive role too. The efficient chip removal from hardened surfaces of about 60 HRC hardness can be ensured by edge formation that can be called special. In this paper the effect of the tool rake angle on the chip removal process is investigated, within this more detailed is the effect on the residual stress formation. The main method of the investigation is the FEM simulation, with which investigations were done in a wide interval of rake angle values.Документ Theoretical surface roughness of surfaces machined by single point cutting tools(НТУ "ХПІ", 2010) Kundrák, J.; Felhö, C.In the article one possible method of theoretical surface roughness determination with help of a general mathematical model is introduced. The determination of surface roughness parameters (Ra, Rz, Rmax) was done for a given tool geometry. We also created relations between theoretical and measured values of the roughness of surfaces machined with this tool geometry.