Research On Electrical Insulation Performance Of Fused Deposition Molded Plastic Parts

The rapid development of 3D printing technology has the advantages of manufacturing complex models,no need to open molds,suitable for personalized production and saving manufacturing costs,and has been widely used in many fields.However,the current application of 3D printing technology in the power industry is mainly in the printing of integrated hardware and electrical equipment,and the application of 3D printing technology to print non-metallic insulation equipment is basically at a blank stage.In individual places in the power industry,it is necessary to manufacture complex and personalized insulation equipment.This is very difficult for traditional open-mold injection molding.It takes a lot of time and increases the production cycle of the equipment.The reliability of power supply cannot be satisfied,so the 3D It is very necessary to introduce printing technology into the field of electrical insulation.This article mainly focuses on Fused Deposition Modeling(FDM)technology in 3D printing technology to study the electrical insulation properties of printed parts.Since the printing parameters of the fused deposition molding technology will affect the quality of the printed parts and the size of the internal pores of the parts,this is also one of the reasons that affect the strength of the electrical insulation properties of the printed parts.Therefore,this article analyzes the reasons for the formation of pores in the fused deposition parts,and uses Ansys finite element temperature field analysis,single factor experiment and orthogonal experiment to analyze the four different printing line widths,nozzle temperature,hot bed temperature,and printing speed.The degree of influence of these parameters on the size of the pores in the printed parts.Through the previous analysis of fusion printing molding,it is known that changing the printing parameters can not make the pores inside the fused deposition part completely disappear,so Maxwell software is used to build the model of the fused deposition printing part,and the different sizes,different sizes,The effect of pores on the internal electric field of the part under the three conditions of multiple pores with different spacing and multiple pores in different arrangement positions.The results show that the size of a single pore has a small effect on the internal electric field strength of the part.Greater impact.Then a platform for electrical insulation testing of fused deposition parts was built,including bulk breakdown test,surface flashover test and dielectric loss test platform;from different stacking methods,different printing paths,different layer thicknesses of each layer and different printing materials.In four aspects,the electrical insulation characteristics of the printed parts' body breakdown,flashover along the surface,and dielectric loss are analyzed.The test results show that: 1.The breakdown strength of the parts with different layer thicknesses in each layer gradually increases with the increase of the layer thickness;the breakdown strength of the parts using the vertical molding method is higher than the parts using the horizontal molding method;the printing path affects the parts The breakdown strength of the printed PLA parts is relatively small;the breakdown field strength of the printed PLA parts is higher than the ABS parts,but the breakdown strength of the two types of printed parts are lower than the corresponding injection molded parts.2.The flashover voltage of each layer of different layer thickness parts gradually increases with the increase of layer thickness;the flashover voltage of the vertical molding method is higher than that of the horizontal molding method;the size of the flashover voltage of the printed part is higher In the end,they are nylon parts,ABS parts,and PLA parts.3.For the same material,the dielectric loss of printed molded parts is higher than that of traditional injection molded parts,and the dielectric loss of printed nylon parts is the highest.