와이어 아크 적층제조된 Wall 형상 구조물의 후가공 시 가공 경로에 따른 엔드밀 절삭특성 분석

다국어 초록 (Multilingual Abstract)

Wire arc additive manufacturing (WAAM) is a metal 3D printing process that involves stacking melted metal wires using an arc heat source. Various studies have been conducted to replace traditional machining processes with WAAM to produce large metal components. Due to the inherent characteristics of WAAM, postprocessing is essential in removing surface irregularities and excess materials. However, stacked structures exhibit properties that are different from those of conventional materials and exhibit anisotropy in the vertical direction (stacking height direction). This leads to different cutting characteristics, where abnormal cutting behavior shortens the tool life. This study analyzed the cutting characteristics and correlations of endmills based on the stacking direction and tool-path postprocessing structures fabricated through WAAM to improve machining performance. Wall-shaped specimens were produced using SUS316L for the postprocessing experiments. The levels and variations of the cutting force signals were analyzed based on the experimental variables (machining path and tool type), and abnormal frequencies were identified through fast Fourier transform analysis. To validate the reliability of the analytical results, the wear levels of the endmill edges were observed using optical microscopy. This study thus confirmed the correlation between the stacking direction and tool path during WAAM postprocessing and demonstrated WAAM’s potential for improving machining performance.