Improving surface properties and quality of 3D metal printed parts using ultrasonic surface nano-crystal modification processing = Nâng cao cơ tính và chất lượng bề mặt của chi tiết in 3D kim loại bằng gia công siêu âm tạo cấu trúc nano bề mặt

Abstract

Metal 3D printing holds significant promise for industrial applications, yet it faces challenges such as poor surface properties and quality. This study aims to enhance the surface mechanical property and roughness of AlSi Mg alloy and 316L stainless steel parts produced through 3D printing, using ultrasonic surface nano-crystal modification (UNSM) processing. Experiments were performed on a CNC machine, where a hard ball, subjected to ultrasonic vibrations, was pressed against the surface of the samples during processing. Real-time force measurements were conducted using a Kistler dynamometer sensor, and the collected data were analyzed using NI-DAQTMmx and LabVIEW software. The results demonstrated that ultrasonic vibration effectively reduced and stabilized the pressing force on the surface during processing. After processing, surface hardness exhibited a remarkable increase of over twofold, while surface roughness decreased by 38% to 62%. These findings indicate the promising potential of UNSM for enhancing the surface property and surface roughness of 3D printed parts.