FDM-3D打印熔体挤出速度关键因素分析

Analysis of key factors of extrusion speed of FDM-3D printing melt

针对FDM成型过程中熔体挤出速度与喷头扫描速度不成配比而引起的喷嘴堵料、模型拉丝现象,采用正交试验方法并结合ANSYS Fluent软件,对喷头内的流道结构参数及不同打印参数条件下进行仿真计算,并对正交试验结果进行极差分析与单因素试验结果分析。结果表明:影响熔体挤出速度最大因素是送丝速度,其次是喷嘴内径,最小是收敛角、出口段长度和打印温度,并提出了送丝速度60 mm/s,喷嘴内径0.4 mm,打印温度210℃,出料段长度L=1.5 mm,收敛角150°为最优工艺方案。最后建立了熔体挤出速度与影响因素之间的指数预测模型并验证了模型准确性。

Aiming at the nozzle blockage and model drawing phenomenon caused by the disproportion of the melt extrusion speed and the nozzle scanning speed during the FDM molding process,the orthogonal test method and the ANSYS Fluent software are used to analyze the flow channel structure parameters and different printing in the nozzle carry out simulation calculation under parameter conditions,and carry out range analysis and single factor test result analysis to the orthogonal test results.The results show that the biggest factor affecting the melt extrusion speed is the wire feeding speed,followed by the nozzle inner diameter,and the smallest is the convergence angle,the length of the exit section and the printing temperature.The wire feeding speed is 60 mm/s,the nozzle inner diameter is 0.4mm,and the printing temperature is proposed.210℃,the length of the discharging section L=1.5 mm,and the convergence angle of 150°is the optimal process plan.Finally,an exponential prediction model between melt extrusion speed and influencing factors was established and the accuracy of the model was verified.