Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
Effect of finishing processes on the surface quality of titanium parts manufactured by the Laser Powder Bed Fusion process.
Submission Author:
Marcio Fernando Cruz , SP
Co-Authors:
Marcio Fernando Cruz, Anderson Vicente Borille, Robert Kersting, Tiago Borsoi Klein
Presenter: Marcio Fernando Cruz
doi://10.26678/ABCM.COBEM2017.COB17-0280
Abstract
Finishing of titanium part comprising mechanical and / or chemical processes are options to achieve necessary surface roughness in accordance with the functional requirements of the part. Low surface roughness is still one primary challenge of parts manufactured by L-PBF (Laser Powder Bed Fusion), a metal additive manufacturing technology. By applying this manufacturing technology, the production of structurally optimized parts is possible, thus enabling a reduction in part weight, raw material wasting and production time. In the aerospace industry, these characteristics are highly desirable to weight reduction of airframe, as well as increasing the manufacturing processes efficiency. At the same time, the structural integrity of the part must be ensured. This work presents an investigation of mechanical and chemical processes for the surface finishing of a complex part manufactured in Ti6Al4V alloy by L-PBF process for aerospace application. The test results show an arithmetical mean Ra of the generated geometry parts of around 15 μm produced by L-PBF. Additionally a value of 9 μm is achieved after the shot peening process. By applying electrochemical polishing this value can be improved to nearly 7 μm. In spite of this promising outcome, a high roughness deviation takes place in accordance with the different inclination and shape of the part surfaces. Therefore, additional developments should be conducted to determine specific parameter sets of the finishing processes according to each as-additive manufactured surface conditions in order to achieve more uniform surface roughness throughout the part.
Keywords
Laser powder bed fusion, titanium, post-processing, surface quality, aerospace
