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Документ Experimental investigation of tribology-related surface topography parameters and hardness of 16MnCr5 case hardened steel(Національний технічний університет "Харківський політехнічний інститут", 2023) Nagy, NoraTribological properties are determinant in the functionality of contacting surfaces of machine elements. The wear resistance or load bearing capacity influence the lifetime of these parts. In this study tribology-related surface topography parameters (Ssk, Sbi) and the hardness of hard turned surfaces are analyzed after hardness and topography measurements. Correlation coefficients were calculated for their relationships. It was found that the cutting parameters affect the wear resistance and the hardness in the opposite direction.Документ Influences of the technological parameters on the surface twist in grinding(НТУ "ХПИ", 2016) Nagy, Nora; Kundrak, JanosThe requirement towards to the functional surfaces of the machine components became higher over the time. The final steps in the machining are supposed to create a surface which ensures wear resistance, longer lifetime and has special features on demand as well. The twist free surface can be considered as a special surface condition. The following paper presents the effect of the grinding parameters to the surface twist.