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Документ Analysis of the effect of tool geometry on the shear angle in metal cutting(НТУ "ХПИ", 2011) Varga, G.Finite element analysis based techniques are available to simulate cutting processes and offer several advantages including prediction of tool forces, distribution of stresses and temperatures, estimation of tool wear and residual stresses on machined surfaces, optimization of cutting tool geometry and cutting conditions. However, workpiece material flow stress and friction characteristics at cutting zones are not always available. This paper utilizes a simple metal cutting model and shows running results. The friction model is based on estimation of the normal stress distribution over the rake face. The changing of shear angle and cutting forces in cutting of different workpiece material in the beginning of cutting is shown in this paper.Документ Investigation of 3D surface roughness on environmentally friendly way milled surfaces(НТУ "ХПІ", 2012) Varga, G.There were significant developments in the machining processes till now which goal were improvement of accuracy and productivity of machining. Next to it todays the protection of the environment is very important too. It can be executed on different ways. One of them is the reduction of coolants and lubricants. Implementation of dry cutting cannot be accomplished by simply turning off the lubricant supply. In fact, the coolant performs several important functions, which, in its absence, must be taken over by other machining process components. This paper shows the execution and evaluation of milling cutting experiment.