ANÁLISE DE USINAGEM DE DIAMANTAÇÃO PARA RODAS DE ALUMÍNIO UTILIZANDO O PROCESSO DE USINAGEM COM FLUÍDO GASOSO ATRAVÉS DO EFEITO JOULE-THOMSON

Abstract

When machining aluminum wheels, as in the case of this experiment, using the diamond machining or wheel mirroring process, as well as other machining processes, a large amount of heat is generated due to friction at the tool part interface. This heat can be detrimental to the results of the process, as it can cause a reduction in the tool's hardness and increased wear and reduced tool life. There are several methods of cooling that can be used in machining. Standardized processes, which use cutting fluids, affect costs in this process, in addition to causing damage to the environment to the health of operators. In this context, dry machining presents itself as a possible solution to the aforementioned problems, although the demands regarding the resistance and the hot hardness of the tools are greater. In this experiment it was proposed the use of a tool cooling system, insert or poly crystalline diamond insert (PCD), and a tool holder that allows the circulation of compressed air inside, coming from the machine with six bar of pressure in the your input. this air passes through the tool holder in the unit and at its outlet where the air is purged to zero degrees celsius, cooling the PCD tool by a physical-chemical effect known as the Joule-Thomson effect. Through this research with the Joule-Thomson effect, the attempt to minimize the negative effects of high cost of the consumption of refrigerant oil, of the variation of the temperature of the tool, was shown. its useful life, the undesirable problems of contamination of the refrigerants, skin irritations in the operators as well as the concern with the preservation of the environment.