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The temperature rise exceeds over 1000°C in cutting process while working with PCBN tools high speed machining. This intense temperature results in wearing of tools and thus diffusion and oxidation are mainly responsible for wearing. This paper proposes the oxidation and diffusion wearing for PCBN cutting tools and analysis has been carried out considering thermodynamics principles. The next step is to find out dissoluation concentration of PCBN tool materials. The temperature range is different for these materials. The Gibbs free energy criterion is utilized for analysis purposes and validates the formed diffusion reaction rules in extreme temperature scenario. The PCBN tools were used for carrying out machining tests at different speeds 50, 95,100 and 180 m/min, feed of 0.1, 0.2 and depth of cut was 0.1, 0.8, 1, and 1.5 mm respectively on controlled lathe machine PUMA300LM. It was revealed that experimentals results matches with theoratical data. These findings will be utilized for future reference for tools designing and material selection.

PCBN Tool Wear for Hard Materials Based on Thermodynamics Principals