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COBEM 2021
26th International Congress of Mechanical Engineering
Numerical Analysis of Conduction and Thermal Contact Resistance in Multi-Layered Cutting Tool
Submission Author:
Rogerio Fernandes Brito , MG , Brazil
Co-Authors:
Rafael Thomaz de Camargo Rodrigues, Paulo Mohallem Guimarães, julio campos, Sandro Metrevelle Marcondes de Lima e Silva, José Carlos de Lacerda, Rogerio Fernandes Brito
Presenter: Rafael Thomaz de Camargo Rodrigues
doi://10.26678/ABCM.COBEM2021.COB2021-1892
Abstract
Through the process of turning, the cutting tool is heated during its use. Temperatures can reach values above 900ºC. Upon reaching these temperature levels, the cutting tool loses its mechanical properties and wears out prematurely. To alleviate this problem, one of the solutions found was to coat the cutting tools with a thin layer of material with thermal insulating characteristics. Thus, the purpose of this work was to numerically simulate the phenomenon of heating, in transient regime, a tool and tool holder set while considering the presence of the coating as well as to evaluate the heat exchange by conduction. Another factor considered in this work was the presence of the contact resistance between the tool and the tool holder, which, according to some studies, has an impact on the temperature field of the cutting tool. In this research, the thermophysical properties of the elements under analysis are treated as temperature dependent. Some parameters related to the contact resistance are taken into account to make the model closer to real situations. Simulations were carried out using the COMSOL® program to solve the transient three-dimensional heat diffusion equation using the Finite Element Method. After that, the temperatures found for the uncoated cutting tool (substrate only) were compared to the temperatures found for the case of the cutting tool coated with Titanium Nitride (TiN), Aluminum Oxide (Al2O3), and Titanium Carbide (TiC).
Keywords
cutting tool, Heat transfer, COMSOL, coating, contact resistance
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