Keresés

Keresési eredmények

• Efficiency of the Machining Process of Circular Shapes by Electrical Discharge Technology

  53-61

  Straka Ľuboslav

  Kuchta Patrik

  Megtekintések száma:

  76

  Due to its high machining precision, EDM technology is nowadays very important in the production of high-precision parts for various industries. The high precision of the machined surface in combination with the ability to machine circular surfaces brings, in addition to several advantages, some negatives. The most significant negative of this machining technology is the relatively low productivity as well as the overall production efficiency. The latter is affected by many accompanying phenomena. The main accompanying phenomenon that contributes to the decline in the overall economic efficiency of EDM is the microgeometry errors that occur due to the non-homogeneity of the EDM process. Another accompanying negative phenomenon is the geometric accuracy errors of the machined surface, as a consequence of systematic destruction of the wire tool electrode, faulty interpolation in its guidance, and, last but not least, its vibration. These aspects consequently lead to the requirement for multiple applications of additional finishing cuts, which significantly reduces the overall economic efficiency of the machining process. Therefore, the experimental research aimed to search for options that can effectively help to achieve higher productivity but especially the overall economic efficiency of the machining process.

• Üreges csonka gömb alakú rugalmas test csavarása

  234-240

  Ecsedi István

  Lengyel Ákos

  Baksa Attila

  Gönczi Dávid

  Megtekintések száma:

  116

  Jelen kutatás tárgya olyan forgástestek csavarási problémája, melyek alakja üreges csonka gömb. A kérdéses test anyaga homogén, izotrop, lineárisan rugalmas. A csavarási feladat megoldásához a Michell elméletet használjuk fel, mely változó körkeresztmetszetű tengelyek csavarására lett kidolgozva. Analitikus megoldást mutatunk be a nyírófeszültségek és elmozdulások meghatározására. A felírt módszer illusztrálására egy numerikus példát is bemutatunk. A példa eredményei felhasználhatóak, mint benchmark megoldás más numerikus módszerekből, például végeselem módszerből nyert megoldások pontosságának elemzésére.

• Improving of Geometric Precision in the Manufacture of Circular Holes Using Technology WEDM

  238-245

  Straka Luboslav

  Dittrich Gabriel

  Megtekintések száma:

  192

  WEDM technology is among the final technology. It is characterized by the high quality of the machined surface. Therefore, a small geometric deviation from the desired shape, position, orientation or run out may have a significant impact on the functionality of the finished component. Its range is largely influenced by the accuracy of the applied electroerosion device, the precision of the workpiece and tool setting, the machining method, but also the combination of each other and the adjustment of all process parameters. They result in the final quality of the machined surface not only in terms of roughness parameters but also in terms of geometric precision of the machined surface. The aim of the paper was to describe the possibilities of improving the geometrical accuracy of WEDM with thin brass electrodes. At the same time, it contributes to an existing database of knowledge that defines the influence of selected aspects on the geometrical accuracy of the machined area in the production of circular openings.