连续纤维三维打印喷头热流仿真与结构优化

Thermal Flow Simulation and Structure Optimization of Continuous Fiber 3D Printing Nozzle

针对连续纤维预浸丝打印过程中出现丝散和堵丝的现象,对典型熔融沉积喷头结构进行优化。利用有限元对喷头结构进行温度场仿真建模,分析加热块的厚度、加热块顶层到散热片底层之间喉管的长度、散热片长度和散热片直径4个核心参数与喷头结构温度场分布的关系模型。结果表明:通过降低加热块厚度和加热块顶层到散热片底层喉管长度,增加散热片直径,可提高散热效率并减少打印所需压力,解决连续纤维预浸丝打印过程中出现的丝散和堵丝问题。

The typical structure of a fused deposition nozzle is optimized to address silk scattering and clogging when printing continuous fiber prepreg filaments.Finite element technology is applied to conduct temperature field simulation modeling and analyze the relationship between the temperature field distribution of the printhead structure and four key parameters which embody the thickness of the heating block,the length of the throat between the top layer of the heating block and the top layer of the heat sink,the length of the heat sink,and the diameter of the heat sink.The results indicate that reducing the thickness of the heating block and the length of the throat between the top layer of the heating block and the bottom layer of the heat sink and increasing the diameter of the heat sink can improve heat dissipation efficiency,reduce printing pressure,and solve the problems of silk scattering and clogging during the printing process of continuous fiber prepreg filaments.