EKLEMELİ İMALAT İLE İMAL EDİLMİŞ METAL PARÇALARA UYGULANAN POLİSAJ İŞLEMLERİ

Additive manufacturing technology has attracted considerable attention in recent years. Since the poor surface quality of additively manufactured metallic parts, post processing are required especially for aerospace, dental and medical applications. Surface post-processing of additively metallic parts is challenging due to complex geometries. This study focuses on dry electropolishing, one of the newly developed surface improvement methods and investigates dry electropolishing of titanium alloy parts manufactured by additive manufacturing with the aim of optimizing process parameters to reduce high initial surface roughness and to improve surface quality of as built parts. Within the scope of surface quality improvement, effects of applied voltage, solid dielectric resin particles concentration and electropolishing time were studied. At the beginning of the study, experiments were carried out with coupon level samples cut from Ti64 sheet plate and after the parameters were determined specimens additively manufactured by Electron Beam Melting machine were used. Various liquid electrolyte types including methanesulfonic acid, sulfuric acid, hydrochloric acid and hydrofluoric acid were used as electrolyte for improving surface quality of the specimens. Hydrofluoric acid was determined the most effective one. Improvement of the surface quality was analyzed by using Scanning Electron Microscopy (SEM), Optical Microscope, Optical Profilometer and roughness tester. The results highlight the critical role of process parameters on polishing efficiency.