Desenvolvimento e avaliação do processo híbrido de usinagem por descargas elétricas e jato de água abrasivo (AJEDM)

Abstract

A new technology in non-traditional machining that has been developed is the association of two or more machining process in only one. This worldwide tendency has been observed for more than a decade. For example, the Abrasive Electrical Discharge Grinding (AEDG), which associates the EDM process to grinding, showed good results to Metal Removal Rate (5 times higher), compared to the die-sinking EDM. This paper aims to develop and evaluate the hybrid machining process which associates EDM to Abrasive Water Jet Machining, called Abrasive Jet Electrical Discharge Machining (AJEDM), especially the use of deionized water as dielectric fluid as a replace alternative to the hydrocarbon fluids generally used as dielectric. These fluids are, in general, based on aromatic hydrocarbons derived from petrol, highly toxic and dangerous to the health of operators as well as to the environment. The results showed higher MRRs with the association of the EDM to the AWJM. The surface generated by the hybrid process showed lower roughness compared to the other machining conditions. The use of deionized water as dielectric fluids showed good technical performance for the hybrid machining AJEDM, since the MRR was similar to that one obtained with hydrocarbon fluid on the die-sinking EDM.