Heat Transfer Modelling of Multilayer Coated Tools During Turning of H13 Hardened Steel: Analogous Coating Layer Approach

This paper investigates the heat transfer of multi-layer coated tools. An analogous coating layer technique is used to compare multi-layered coated tools to mono-layer coating tools and develop a heat transfer model for mono-layered coating tools. The equivalent heat capacity, density, and thermal conductivity of the coating are determined based on the geometric size, initial conditions, and boundary conditions, given the tool rake face temperature. The heat transfer efficiency of the multilayer coating is significantly influenced by the coating layers, the thickness of the layer, and the coating material. The results show that the equivalent coating layer approach is suitable for calculating coating temperature enhancement in the cutting heat transfer. The calculation of cutting temperatures for multilayer-coated tools was conducted and subsequently compared to experimental findings, revealing an error margin of around 10%. The findings of this study indicate that analytical models are also suitable for modelling cutting temperatures in multi- layer coating designs.