Structural design of large-format three-nozzle 3D printer
Currently,the 3D printers based on the FDM technology are widely used,but these 3D devices have such bottle-neck that the printing efficiency and the surface forming accuracy cannot be improved at the same time.In this article,a new three-nozzle printing mode is proposed,which uses the nozzles with different diameters to print various workpiece structures.Efforts are made to design the small-diameter nozzles for printing the workpiece surface,in order to improve the surface accuracy;efforts are made to design the large-diameter nozzles for printing the internal support and the auxiliary support,so as to improve the printing efficiency.Besides,the parallel hybrid-driven transmission mechanism is designed to eliminate the load brought by the power source.Thus,the printing format has expanded while ensuring reliable and stable operation.The virtual structure is de-signed and optimized by means of 3D modeling;the static analysis is conducted to verify whether the transmission mechanism is reliable;the fluid mechanics analysis is carried out to simulate both the velocity field and the temperature field of the extrusion mechanism's fluid inside.The three-nozzle 3D printing prototype is used for the experimental test.Such performance parameters as printing mode,printing efficiency,surface accuracy,and dimensional accuracy are tested.It is shown that this printing mode is feasible;the printing efficiency and the surface accuracy have improved at the same time.In addition,both the printing size accuracy and the printing format have improved.This study lays a solid foundation for further research on the large-format and high-precision 3D printing technology.
3D printerthree-nozzle printing modeparallel hybrid-driven transmission mechanismprinting efficiencyforming accuracy
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