Abstract
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.
Highlights
The cutting process has major challenges like tools diffusion which results in degradation of performance and surface smoothness
The damage and wear resulting from this high speed machining is very different from the common speed machining process [8]
The different failure mechanism can happen during poor working conditions in high speed machining environments as compared to classical cutting mechanisms and the consequences for tools wearing and damages are increased by manifold
Summary
The cutting process has major challenges like tools diffusion which results in degradation of performance and surface smoothness. It results in chattering, damaging of machine parts, tools, workpiece and so on [1]. The different failure mechanism can happen during poor working conditions in high speed machining environments as compared to classical cutting mechanisms and the consequences for tools wearing and damages are increased by manifold. Thermodynamics theory can be applied for these non linear processes and it has proven to be very effective and feasible for analysis as well. This paper considers PCBN tools wear for high speed advanced cutting mechanism based on thermodynamical principles and analysis of parameters considering oxidation and diffusion wear rules are carrid out. This research will provide reference for design and optimization for different tool materials
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