FDM有限元仿真与层间连贯分层复合扫描路径研究

Research on FDM Finite Element Simulation and Interlayer Coherent Layered Composite Scanning Path

3D打印扫描路径是影响打印质量和效率的重要因素。本文在研究熔融沉积成型(Fused deposition modeling,FDM)打印原理及有限元仿真的基础上,旨在给出一种层间连贯分层复合扫描路径方法。首先分析了往复直线扫描与偏置扫描的工艺特点并提出了层间连贯的分层复合扫描路径;然后采用生死单元技术建立了FDM成形过程有限元模型并进行了实验验证。结合有限元仿真与实验,结果表明,本文所提扫描路径不仅将往复直线扫描和偏置扫描的优势融合,且分层复合的挤出方式增加了打印的连贯性和整体性。

The scanning path of 3D printing is an important factor affecting printing quality and efficiency.On the basis of studying the printing principle and finite element simulation of Fused Deposition Modeling(FDM),this paper aims to give a method of interlayer coherent layered composite scanning path.Firstly,the process characteristics of reciprocating linear scanning and offset scanning were analyzed,and a layered composite scanning path with interlayer coherence was proposed;Then,a finite element model of the FDM forming process was established using the life and death element technology and experimentally verified.Combining finite element simulation and experiments,the results show that the scanning path proposed in this paper not only integrates the advantages of reciprocating linear scanning and offset scanning,but also enhances the coherence and integrity of printing through the extrusion method of interlayer coherence and layered composite.