Development Of High-temperature Printing Head For Hot Melt 3D Printer

With the rapid development of modern industry,manufacturing is gradually shifting from traditional processing to intelligent manufacturing.3D printing technology,as a new type of forming technology,has been widely used in aerospace,automotive manufacturing,and other fields due to its low cost and high efficiency.Among them,the hot melt 3D printer is the most widely used.However,currently available desktop FDMtype 3D printers can only print materials with lower melting temperatures such as PLA and ABS,and cannot print high-performance plastics such as PEEK with higher melting points.Therefore,researching and designing a high-temperature hot melt print head suitable for desktop 3D printers is of great significance to achieve the molding of PEEK and other engineering plastics and to print high-performance structural components.In this context,this paper focuses on the research and design of a high-temperature print head for PEEK materials for hot melt 3D printers to achieve the printing and molding of high-temperature-resistant PEEK engineering plastics.The main research contents are:Currently,most of the fused deposition modeling(FDM)3D printers can only print low-melting materials such as PLA and ABS,with a molding temperature of around200℃.However,these materials have poor heat resistance and cannot work in hightemperature environments,which limits the engineering applications of FDM 3D printing.Therefore,designing a high-temperature melting 3D printing head to expand the range of printable materials,including engineering plastics and even metals,is of great significance to produce high-performance structural components applicable to engineering fields.In this context,this paper focuses on designing a high-temperature printing head for PEEK materials to achieve printing and molding of high-temperature resistant engineering plastics.The main research contents include:Firstly,let’s analyze the composition and working principle of the extrusion head of a fused deposition modeling(FDM)3D printer,and examine the suitable range and pros and cons of different extrusion methods based on their respective principles.We will then conduct a performance target analysis for designing a high-temperature printing head,taking into account the characteristics of commonly used printing materials and PEEK materials.Furthermore,we will analyze the flow channel structure and heat transfer methods of the nozzle from the basic theories of thermodynamics and fluid mechanics,providing theoretical support for subsequent research work.Next,based on the structure and working principle of the FDM-type 3D printing nozzle,the structure of the high-temperature printing head was designed and modeled using Solid Works software.The designed nozzle,heating block,and other parts were imported into ANSYS for temperature field analysis.Based on the analysis results,the materials and structures of the nozzle and throat were optimized and improved.To solve the problems of insufficient driving force,unstable wire feeding,and complicated wire installation during the printing process,the driving mechanism was improved and optimized to effectively reduce the occurrence of such phenomena.Finally,the temperature field of the entire nozzle device is simulated,and the temperature of each key part of the structure is analyzed to determine whether it meets the printing requirements.A physical model is then built,and its heating and printing performance are tested.Temperature measurements of key parts are taken using a thermistor probe and an LCD display,and the results are compared with the simulation to verify the reliability of the analysis.The experimental results show that the temperature distribution of the high-temperature nozzle designed in this paper is reasonable,which proves the feasibility of the high-temperature printing head design.The research results of this paper provide effective solutions to the stability of driving force and the heat dissipation of the nozzle device,which has important theoretical significance and engineering application value for the research of desktop high-temperature printing heads.