In this work are given the researched results of cutting tool flank wear P-30, during the processing with turning of alloyed steel 42 Cr Mo4 which is quite difficult to process. The experiment is realized with the lathe machine IK62, whereas the measurement V B is done by microscope type JLC680148. For data process is used a statistic method with five factors. y=2 k +No 1. INTRODUCTION The knowledge of mechanism of cutting plate flank wear from the hard metal in the function of the processing

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... terial, cutting regimens and means of processing, has an important role during the projection of technological process. The size of flank wear is a result of reaction of different forms of energy, mainly of mechanical energy, temperature, chemical composition, electric and magnetic conductivity. The assessment of the size of flank wear of metal-cutting tool is done through these indicators: • Geometric indicators, which describe stereo metric characteristics of metal-cutting tool. • Technological indicators, which determine the change in the technological quality of production, mainly the accuracy of obtained parameters, form, position and quality of obtained surface during processing, expressed by parameters of the roughness of processed surface. • Energy indicators, which pertain to the change of energy relations in decohosation process, which means that the increase of cutting forces requires greater cutting power, which results in the increase of temperature in the cutting process and oscillations of the machine-clamping tool-metal cutting tool-processed particle system.