Research On 3D Printing Of High Viscosity Fluid Materials Based On Ultrasonic Vibration

3D printing technology is widely used in medical and pharmaceutical,aerospace,construction engineering and other fields due to its high molding efficiency and the ability to manufacture complex structures.At present,materials and processes are two major reasons for limiting the development of 3D printing technology.In order to solve the problem of nozzle clogging caused by the 3D printing process of high-viscosity fluid materials,an ultrasonic vibrator nozzle based on ultrasonic vibration is designed,so that the nozzle is in a state of high-frequency vibration during printing.The speed of high viscosity fluid material flowing out of the nozzle is larger,and the problem of nozzle clogging is solved.Based on the design theory of ultrasonic transducers and horns,an ultrasonic vibrator nozzle with a frequency of 30 KHz was designed.The ANSYS Work Bench software was used to perform a modal analysis on the nozzle,and the 25th-order mode vibration mode was obtained.And the small end displacement of the horn is the largest,which meets the design requirements of the horn.The fluid flow of the high-viscosity fluid in the ultrasonic transducer nozzle was simulated and analyzed using Fluent software.The boundary conditions of ultrasonic vibration were applied to the wall surface by means of Dynamic Mesh and user-defined functions(UDF).The effects of different ultrasonic frequencies,amplitudes and vibration directions,and different inlet pressures on the flow phase diagram and flow velocity of highviscosity fluids were compared and analyzed.The results show that in the case of smooth flow of high-viscosity fluid,a small amplitude and high-frequency longitudinal ultrasonic vibration form should be selected;meanwhile,a moderate inlet pressure is used for extrusion,and the molding accuracy is the best.The 3D printer control system based on Marlin firmware is optimized so that the 3D printer control system and the ultrasonic vibration system can work together.Finally,through experiments,the effects of ultrasonic vibration parameters,printing parameters,and extrusion parameters on molding accuracy and surface quality during the 3D printing extrusion process of high-viscosity ceramic pastes were studied.