Research On Nozzle System Design And Vibration Characteristics Of FDM Color 3D Printer

The FDM 3D printer on the market prints a single color and shows poor colors.In order to print color items for fused deposition modeling 3D printer,it is usually necessary to change the monochromatic nozzle into a mixed color nozzle.After the improvement,the quality of the nozzle will become larger and larger,which will affect the overall vibration characteristics and finally cause a series of printing accuracy problems.So,this paper chooses to start from the mechanical structure and control system of the printer nozzle to build the whole FDM color 3D printer.The vibration analysis of the printer nozzle is carried out in combination with the simulation and the actual test to optimize the nozzle structure and printing parameters of the color 3D printer.Finally,it improves the moulding quality of the FDM color 3D printer.This paper has engineering application significance,and has reference value for the construction and optimization analysis of FDM color 3D printer.Firstly,the mechanical structure of the FDM color 3D printer is constructed with the nozzle system as the main research object.The main components of the nozzle system are determined by analyzing the mixing principle of the nozzle and the whole mechanical mechanism.The proper nozzle device,extrusion device and synchronous belt are selected to make up the whole nozzle system.The mechanical structure of the whole FDM color 3D printer is built based on the original Ormerod structure.The modal analysis of the printer is carried out by using the finite element modal analysis tool,and the improvement scheme of the printer mechanism is selected according to the analysis result.Then,the simulation model of nozzle belt system is established,and the longitudinal vibration characteristics are simulated and analyzed.By means of multi-body dynamics software and rigid-flexible coupling theory,the model of FDM color 3D printer nozzle belt system is established.From the longitudinal characteristics of the printing process,the acceleration amplitude of the nozzle system vibration at different printing speeds is analyzed.The results are compared with the actual test results to verify the effectiveness of the simulation.Finally,the vibration acceleration amplitude of the nozzle of the built-up FDM color 3D printer are tested and analyzed.The vibration test platform is built by using MEMS acceleration sensor and LabVIEW and MATLAB analysis software.On this basis,the longitudinal and vertical vibration of the mixed-color nozzle of FDM color 3D printer is analyzed,and the parameters of the printer are optimized.The results show that using Archimedes and string filling trajectory is more favorable to reduce the longitudinal vibration of the nozzle.The RMS of the maximum acceleration amplitude is reduced by 71.29%compared with the honeycomb-filled trajectory.The choice of triple torque stepping motor is more favorable to reduce the nozzle.The vertical vibration of feed can also significantly reduce the number of clogs and improve the molding quality of FDM color 3D printer.