Title: 
Application of Inverse Problem Techniques for the Thermal Study of Machining Tools with Different Geometries and Coatings.


Summary
This project aims to analyze the thermal effects of coatings on a carbide tool during the turning process, using the COMSOL Multiphysics 5.3a program and an inverse problem technique. In the thermal model, the use of a carbide tool, a tool holder and a shim is considered. The influences of these elements are described by the transient three-dimensional heat diffusion equation, whose solution will be obtained using the COMSOL program. Among the advantages of using this program (CONSOL), we can highlight the ease of modeling the coating, which has a small thickness, in the order of micrometers (µm). The tools will have Titanium Nitride (TiN) and Aluminum Oxide (Al2O3) coatings. The model is subject to convection and radiation boundary conditions in regions exposed to the environment and prescribed heat flow at the chip-tool contact interface. The thermal properties used are temperature dependent. The technique adopted to solve the inverse problem is the Specified Function. This technique searches for a heat flux value that minimizes an objective function.  This function is defined by the square of the difference between the experimental and numerical temperatures for each time interval. A numerical code in MATLAB, in conjunction with COMSOL software, is used to estimate the heat flow. Once the heat flow is known, COMSOL is used again to solve the transient heat diffusion equation and obtain the temperature field in the model. The heat flux obtained in this work is compared with heat fluxes from previous works to validate the methodology. Temperatures at the chip-tool interface for uncoated and coated cutting tools will be determined. For both types of cutting tool coatings, the aim is to obtain the temperature at the chip-tool interface, when compared to the uncoated cutting tool.

Financing Body: 
FAPEMIG – Minas Gerais Research Support Foundation


Project number:
FAPEMIG/DAP no. 50682876/2022 of August 2, 2022

Validity: 
02/08/2022 to 15/05/2025

Funded Resource:
BRL 40,549.97

Research Team:
Prof. Dr. Rogério Fernandes Brito (Coordinator)
Prof. Dr. Ricardo Luiz Perez Teixeira (Collaborator)
Prof. Dr. José Carlos de Lacerda (Collaborator)