High-frequency metal jet-on-demand jetting forming technology based on forced vibration

The existing metal drop-on-demand jetting technology exhibits high precision but low frequency in its demand-based jetting mode, while the continuous jetting mode achieves high frequency but low precision. To address the issues inherent in metal droplet jetting and to balance both deposition precision and high-frequency characteristics, this paper presents a novel high-frequency continuous metal droplet jetting method based on forced vibration of the jet tube. This method controls the reciprocating motion of the jet tube, utilizing the pulse pressure generated by the inertial force acting on the molten metal inside the tube to eject the metal. The jet tube is then induced to undergo high-frequency forced vibration, causing the molten metal inside the tube to eject at the same frequency, thereby achieving precise and efficient droplet jetting. Experimental studies were conducted on the jetting mechanism, revealing that with increasing motion displacement of the jet tube, the pulse pressure of the molten metal increases, facilitating droplet formation and enhancing the droplet flight velocity. Within the range of the forced vibration frequency, the jetting frequency can reach 5 kHz, enabling stable and uniform jetting. The two-dimensional and three-dimensional shaping capabilities of the technology were experimentally verified.