Analysis Of The Dynamic Chcracteristics And Structural Optimization Of The Industrial Grade FDM 3D Printer

At present,FDM(Fused Deposition Modeling)3D printing technology is developing towards precision,intelligence and generalization.To achieve hign-speed and high-precision printing,the structure of FDM 3D printers must be designed properly to ensure good static and dynamic characteristics.This paper takes the K1000 industrial-grade FDM 3D printer as the research object and conducts theoretical and experimental studies on the following key problem:1.Simulation of the rigid-flexible coupling dynamics of the FDM printer is conducted to analyze accuracy of the printer under the impact of deformation of key components,inertia and nozzle material.The results show that the motion error caused by the deformation of components can not be ignored during high-speed and high-acceleration printing.In addition,inertia variation leads to printing errors in the printing process of X and Y axes.Finally,difference of nozzle material can cause differences in the printer's dynamic characteristics.2.The static and dynamic characteristics and the associated influencing factors of the printer are analyzed.Under the influence of rolling contact,a finite element model of the printer's actuator is established.The natural frequency and mode shape of the 3D printer is then obtainded using modal analysis.The frequency response curve corresponding to the natural frequency of the printer is also generated using harmonic analysis.The influence of the nozzle position and the beam material on the static and dynamic characteristics of the printer are then studied.3.Related experimental research of FDM printer is conducted.The sixth-order modal parameters of the system are obtained by the Hammer method,which verifies the finite element analysis results.The time and frequency domain diagram of the system under several typical operating conditions are obtained by acceleration tests.The main frequency components of the system are obtained there after to verify the rationality of the dynamic model.4.The structure of the beam of FDM 3D printer is optimized.Topology optimization is used to create the overall shape of the beams and size optimization is further conducted for the detailed dimentions.Compared with the original model,the mass of the optimized modal is reduced by 6.1%,with improved static/dynamic,showing good results.