Eventos Anais de eventos
COBEF 2017
Congresso Brasileiro de Engenharia de Fabricação
CHARACTERIZATION OF HOLES OBTAINED BY FAST HOLE EDM DRILLING AND TREPANNING LASER DRILLING IN INCONEL 718 PLATES
Submission Author:
Ricardo Vinicius Bubna Biscaia , PR
Co-Authors:
Murilo Teixeira Ribas, Anderson Geraldo Marenda Pukasiewicz, Aldo Braghini Junior
Presenter: Ricardo Vinicius Bubna Biscaia
doi://10.26678/ABCM.COBEF2017.COF2017-1085
Abstract
Fast Hole Drilling EDM and Trepanning Laser Drilling are applied in turbine blades cooling holes manufacturing and repair. The purpose of the present work is to characterize the channel surface of the microholes machined by these different techniques in plates of a Inconel 718 Nickel superalloy. From this characterization, it is possible to verify which technique allows to obtain holes with greater control of surface roughness and to verify the characteristics of machined surface, as presence of craters and spatters caused by the method of machining used. EDM holes were drilled using a two-electrode material: copper and brass; and by Nd: YAG laser drilling by trepanation. A statistical design was defined to evaluate the influence of the main input parameters. It was verified that the roughness had significant variation with the different manufacturing techniques, as well as input parameters for each technique. Roughness in EDM holes was more influenced by the variation in the material of the electrode and current in the EDM and by the energy in the laser drilling. It was observed that the presence of spatters and craters in drilling by EDM is greater when compared to Trepanning Laser Drilling. Therefore, with regard to surface finishing, it is possible to define that the technique of Trepanning Laser Drilling has advantages over drilling by EDM of fast hole.
Keywords
trepanning laser drilling, EDM fast hole drilling, cooling micro-holes, surface roughness, central composite statistical design
