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Документ Efficiency of material removal and machining in cutting(Національний технічний університет "Харківський політехнічний інститут", 2020) Molnár, Viktor; Deszpoth, István; Kundrák, János; Markopoulos, Angelos P.Among the methods and parameters used for analyzing the productivity of machining procedures, this paper deals with an analysis based on the efficiency (material volume removed in unit time) of material removal. The paper focuses on how this specific indicator, the material removal rate (MRR), changes when different machining procedures and production sub-phases are considered.Документ Increasing productivity of combined procedure by reducing grinding allowance(Національний технічний університет "Харківський політехнічний інститут", 2019) Kundrak, Janos; Deszpoth, Istvan; Molnar, ViktorExperiments were carried out to determine the minimal extent of acceptable grinding allowance on case-hardened workpieces machined by combined procedure. The extent of acceptable or unacceptable allowance was determined by a “painting” method. After bore grinding tests for 2D roughness, roundness and 3D topography measurement were carried out. It was found that a 0.03 mm allowance in the bores of gearbox wheels of cars is satisfactory and also necessary to obtain the required level of topography when combined machining was applied and when no white layer formed in the turning procedure. This is a significant finding, because the usual allowances of 0.05 mm or higher (in many cases significantly higher) can be decreased to 0.33 mm and the machining time of bore grinding can be reduced in proportion to this extent.