In machining processes, cutting tools reach temperatures higher than 900 °C, thus deteriorating their mechanical properties. To reduce this problem, cutting tools are coated with materials possessing thermal insulation characteristics. Such coatings benefit machining, providing faster cutting speeds and tool life. However, the heating of the tools is still present. Therefore, in this work, an analysis of the thermal effects of coating in a carbide tool using COMSOL® software is presented. The effects of convection, radiation, and contact resistance between the tool and the tool holder are also considered. The thermophysical properties of the tool elements depend on temperature. Experimental measurements of parameters related to contact resistance were carried out to make the thermal model closer to real situations. The COMSOL program was used to solve the heat diffusion equation using the finite element method. Comparisons of calculated temperatures are presented for the uncoated (substrate only) and coated inserts with aluminum oxide (Al₂O₃) and titanium nitride (TiN), respectively. Coatings fulfill the role of protecting the heat directed to the tool substrate, but at different intensities. While the Al₂O₃ acts as a thermal barrier, retaining heat on the output surface, TiN has a less intense temperature gradient in the space of 10 μm, including a lower temperature on the output surface. The contact resistance raised the temperature on the output surface by 45.2 °C, 39.6 °C, and 39.5 °C for uncoated tools and coated by Al₂O₃ and TiN, respectively.

在加工过程中，刀具的温度会超过 900 °C，从而降低其机械性能。为了减少这个问题，切削工具涂有具有隔热特性的材料。这种涂层有利于加工，提供更快的切削速度和刀具寿命。然而，工具的加热仍然存在。因此，在这项工作中，我们使用 COMSOL® 软件分析了硬质合金刀具涂层的热效应。还考虑了对流、辐射和刀具与刀架之间的接触电阻的影响。工具元件的热物理特性取决于温度。对与接触电阻相关的参数进行了实验测量，以使热模型更接近真实情况。COMSOL 程序用于使用有限元方法求解热扩散方程。对未涂层（仅基材）和带有氧化铝（Al₂ O ₃ ) 和氮化钛 (TiN)。涂层起到了保护导向工具基材的热量的作用，但强度不同。虽然 Al ₂ O ₃充当热障，将热量保留在输出表面上，但 TiN 在 10 μm 的空间内具有较小的温度梯度，包括输出表面上的较低温度。接触电阻将输出表面的温度升高了 45.2 °C、39.6 °C 和 39.5 °C（对于未涂层刀具和由 Al ₂ O ₃和 TiN涂层的刀具）。