Optimization Design Of Desktop-level 3D Printer Based On FDM Technic

FDM 3D printing equipment is with small size,simple process,the clean and safe operating environment,low cost,materials with environmental protection,direct processing models.At the present stage is still able to meet the needs of some areas.In the process of melt deposition,the advantages and disadvantages of the equipment have great influence on the printing quality of the processing model.Through the combination of theoretical analysis and experimental research,this paper focuses on the performance of FDM desktop 3D printer equipment,research the main factors that affect the molding quality of the model with the aim to improve the quality of printing model.last,this paper puts forward the corresponding optimization design.Firstly,the paper systematically introduces the factors that influence the quality of FDM 3D printing model from the aspects of principle,molding process and post-processing.The "step effect" error and the error caused by the wire are made a theoretical analysis,and focusing on the analysis of FDM desktop-level 3D printing device performance.lt is concluded that the content of the paper is from three aspects:Z axis drive,nozzle group structure and temperature control.Secondly,the Z-axis drive is taken as the research object,and the formula of the trapezoidal screw is given,and through theoretical calculation and model printing experiment,it is analyzed and studied.In view of the shortcomings of the trapezoidal screw,the paper puts forward the method of optimizing the design of Z-axis drive by using ball screw.The ball screw was selected by theoretical calculation.Thirdly,taking the nozzle group structures as the research object,the problem of thermal deformation of Teflon tube is carried out,and the simulation analysis based on ANSYS is carried out.According to the comparison results,this paper presents a design scheme of the optimization of the nozzle group structure,which is based on the comparison of the actual situation of the screwdriver.The test results show that the optimized nozzle group structure has the advantage of ensuring the stability of wire feeding.Finally,taking the method of temperature control as the research object,according to the temperature "S" curve based on Matlab,the transfer function of the temperature system adopts the first order inertia hysteresis to approximate the processing.And the temperature control experiment shows that the PID control still has some defects in the thermostatic control,the temperature control optimization method based on fuzzy control and PID control is proposed.The fuzzy PID control effect is analyzed by Matlab/Simulink simulation.The results show that the fuzzy PID control is more resistant to temperature interference and can improve the nozzle group Heating performance,to achieve constant temperature control.