Design Of High Temperature Fused Deposition 3D Printing Equipment And Software Development

In recent years,the degree of application of 3D printing market in China has been deepening,and 3D printing technology is developing in the direction of high performance,multi-material and intelligence.Special engineering plastics have received widespread attention for their superior characteristics,but also put forward new challenges for printing equipment and processes.At present,there is little research on 3D printing of special engineering plastics in China,the commercialization of the corresponding equipment is very low,and the existing equipment is expensive and the performance varies.In this paper,we design and develop a high-temperature 3D printing device that takes into account functionality,economy,reliability,and aesthetics to meet the needs of related enterprises.At the same time,to improve the surface quality and user experience,the slicing software is optimized and developed,and combined with Internet of Things technology,the remote monitoring and visualization application of printing process is realized.The main contents are as follows:1.Designed and built high-temperature 3D printing equipment,using modular design ideas,focusing on the core nozzle components,temperature control system and shape frame.Combined with the numerical simulation research method,the structural optimization of the throat component was completed by analyzing the temperature field distribution of the forming chamber cavity and nozzle assembly.The maximum heating temperature of the optimized nozzle assembly can reach 450℃.The forming chamber adopts PTC hot air system and the control mode is PID control by the motherboard.The maximum temperature of the cavity is about 100℃.2.The effect of chamber temperature and nozzle temperature on the quality of PEEK printing parts was investigated.The test results showed that the temperature of the molding chamber at 90°C can effectively reduce the degree of warpage of the parts;the higher nozzle temperature can ensure a stable flow rate of the extruded wire,while the interlayer bonding effect of the parts is better and the extruded wire width is more uniform.Under the suitable printing parameters(nozzle temperature 420℃,ambient temperature 90℃,hot bed temperature 150℃,printing speed 20mm/s),the quality of the printed parts is good and the equipment meets the design requirements.3.We propose an isometric offset printing strategy for starting points of inner and outer wall between layers.The strategy program is developed and the console software is compiled based on the open-source slicing engine Cura Engine.The advantages and disadvantages of different strategies are compared and analyzed: the isometric offset printing strategy can effectively solve the problem of Z seam on the printed part surface,its printing efficiency is between the proximity strategy and the random strategy,and it can improve the structural stability of the part to a certain extent.4.The remote monitoring system of 3D printing process is designed and implemented based on the IOT platform.We adopt the communication scheme of MCU+WIFI module,and develop the communication program with the platform based on Marlin firmware.The temperature,printing progress and printing status information of the equipment working are displayed through the visualization application on the Web and mobile terminal,and the stop command can be sent to the equipment terminal.