Eventos Anais de eventos
ENCIT 2022
19th Brazilian Congress of Thermal Sciences and Engineering
USING INVERSE TECHNIQUES TO SOLVE HEAT TRANSFER PROBLEMS WITH APPLICATION TO A HIGH-SPEED STEEL TOOL DURING A TURNING MACHINING PROCESS
Submission Author:
Rogerio Fernandes Brito , MG , Brazil
Co-Authors:
Giovani Wilhan Viana Carvalho, Heitor Alves Falqueto, Diego Barboza , Rogerio Fernandes Brito, Paulo Mohallem Guimarães, Sandro Metrevelle Marcondes de Lima e Silva, Solidônio Carvalho
Presenter: Solidônio Carvalho
doi://10.26678/ABCM.ENCIT2022.CIT22-0572
Abstract
In the turning process, mechanical energy is transformed into heat due to the friction between the tool and the workpiece and the plastic deformation of the chip. Thus, turning procedure can be approached as a thermal problem, since the aforementioned process causes a high temperature gradiente. In this study, some cutting parameters até brought about and can be applied to thermal effects that are produced by the tool. Thus, such parameters are tools to detect specified conditions that enhance tool life, even under extreme working conditions. Due to the movement of the workpiece during the cutting process and the presence of an insert, there is a constraint when measuring the temperature at the interface between the insert and the tool. Thus, the use of efficient numerical techniques is necessary for the analysis of the thermal problem. In this sense, reserachers from the heat transfer laboratories of the Federal Universities of Uberlândia (UFU) and Itajubá (UNIFEI) have been developing specific computer programs. Such programs together with commercial packages, which use inverse techniques, are used to determine the heat flow and temperature distribution in manufacturing processes, more specifically in turning machining processes. One of the computational packages available in the laboratories is COMSOL Multiphysics 6.0. This tool approximates solutions to direct and inverse heat transfer problems. Comsol Multiphysics is based on the numerical solution named the Finite Element M.ethod. A three-dimensional transient thermal model is used with tetrahedral elements in an unstructured mesh. To solve the inverse problem, some inverse techniques provided by COMSOL were used in this work, such as Nelder-Mead (NM) and Levenberg-Marquardt (LM). Another inverse technique used is the Linear Specified Function (LSF), which is written in MATLAB environment. Such technique is used in conjunction with COMSOL Multiphysics, by interfacing MATLAB with the commercial COMSOL package via LiveLink for MATLAB. To validate the computational package, experimental data from previous work by the current authors are used. Given these data, the numerical results obtained are compared. Then, the effectiveness of the LM technique to solve the thermal problem is therefore consolidated in order to result in more suitable computational cost ratios. The percentage deviations of the estimated numerical temperatures, for the case at 900 rpm, reached agreable values of up to 1.45%. Hence, this condition points out the procedure effectiveness. The percentage deviation of the heat flux estimated in this work with that estimated by LSF, by these authors in previous works, was up to 1.78 %.
Keywords
COMSOL, free cutting steel tool, Three-dimensional heat conduction, Inverse methods, High speed steel tool
