Research And Design Of Piezoelectric Nozzle Based On FDM-3D Printer

As an additive manufacturing technology,FDM-3D printing technology has gradually developed into a new manufacturing technology.Different from traditional manufacturing technology,FDM-3D printing technology can greatly reduce the manufacturing difficulty of complex parts,and it has advantages such as simple operation,low cost and material saving.However,existing FDM-3D printers generally have low forming accuracy and slow printing speed.Therefore,there is still a lot of research space based on FDM-3D printer.In this paper,the author is based on FDM-3D printer is molding such as low accuracy,the printing speed is insufficient.The article analyzes the working principle of 3D printers,introduced the working principle of the piezoelectric extrusion and the 3D printer nozzle was redesigned.The piezoelectric finite element simulation analysis of the piezoelectric ceramic element shows that the maximum deformation displacement is 44.19?m,and the designed output displacement of the flexible hinge amplification mechanism is 349.35?m,which can meet the requirements of this design.The thermodynamic simulation and optimization of the piezoelectric sprinkler based on the FDM-3D printer showed that the mechanical properties of the optimized structure performed well,which could ensure the normal operation of the piezoelectric ceramic component and meet the requirements of this design.The fluid dynamics simulation of the injection process of the piezoelectric nozzle based on FDM-3D printer was carried out to obtain the variation of the liquid extrusion morphology and the basin velocity at different times.The effects of different viscosity,piezoelectric frequency and driving distance were also obtained for the size and velocity of the extrusion droplets.The primary and secondary relationship between the viscosity of the molten metal,the piezoelectric frequency and the driving distance on the size of the extruded droplets was obtained by orthogonal experiment method: molten metal viscosity> driving distance> piezoelectric frequency.The diameter of the droplet obtained by finding the best combination of parameters from the orthogonal test table is 0.786 mm,which is smaller than the diameter in the table,which verifies the rationality of the optimal combination parameters obtained from the orthogonal experiment.Orthogonal experiment method was used to obtain the primary and secondary relationship between the viscosity of the molten metal,piezoelectric frequency and driving distance on the size of the basin velocity: piezoelectric frequency> molten metal viscosity> driving distance.From the Range size of the orthogonal experiment table,it can be seen that increasing the piezoelectric frequency in the adjustable parameter range can effectively improve the extrusion capacity of the droplet,and is more conducive to the extrusion of droplet.According to the fluid dynamics simulation of a piezoelectric sprinkler based on the FDM-3D printer,the minimum diameter of the extruded droplets is 0.786 mm and the maximum velocity is 3.46m/s.Compared with traditional piston nozzles,screw nozzles and pneumatic nozzles,it can improve the printing velocity of 3D printers and provide reference for later development of 3D printers with higher precision and efficiency.