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The article examines the cutting characteristics of the developed composite material based on aluminum oxide micropowders with silicon carbide nanopowder additives obtained with the help of electric sintering. The influence of thermal conductivity of the developed composite Al2O3-SiC based material on the wear and durability of the material in application of cutting tool is examined, and a comparison with the traditional cutting ceramic tool materials is made. Considering that the process of cutting with ceramic inserts is carried out without the cutting fluids, the heat removal improvement from the cutting zone makes it possible to increase the tool life. It is proposed to use the thermomechanical parameter B for a comparative assessment of cutting ceramic composite material characteristics.

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The machining of hardened surfaces has increased significantly in the past years. While abrasive machining has held the lead up to now, the productivity of cutting by single-point tools is improving. In this paper the machining efficiency of surfaces of identical quality according to R z and international tolerance (IT) class was analysed after machining by various procedures: traverse bore grinding; hard turning by standard insert; and a joint procedure by standard insert in the hard turning operation. Based on an analysis of the material removal rate (MRR), environmental load and flexibility of machining, the procedures were ranked and recommendations were made for their application area considering the running conditions. It was found that the MRR is most favourable in the hard turning version. However, if the running conditions of the built-in part require a random topography, the most efficient version is the joint procedure.