过程参数对熔丝成型产品结合颈的影响

熔丝成型(fused filament fabrication，FFF)是当今应用最广泛的增材制造技术之一.FFF产品相邻挤出材料丝之间的结合颈对其成型质量有重要影响，并随过程参数的改变而明显变化.针对不同过程参数对结合颈的影响进行了实验与理论研究.根据部分析因设计制备了不同过程参数下的FFF样件，利用扫描电子显微镜完成结合颈的实验研究，并建立了结合颈的理论模型.结果表明:过程参数对样件结合颈有一定的影响；适当降低打印速度或增加挤出温度、挤出宽度、打印层厚度及填充率，结合颈增大，但改善效果有限，理论模型准确可靠.

Influence of Processing Parameters on the Bonding Neck of Fused Filament Fabrication Products

Fused filament fabrication(FFF)is one of the most widely used additive manufacturing technologies today. The bonding neck formed between the adjacent extruded material filaments of FFF products has an important influence on the forming quality， and it is significantly influenced by the processing parameters. The experimental and theoretical study was carried out on the influencing rule of different processing parameters on the bonding neck. FFF samples built with different processing parameters were designed and prepared according to fractional factorial design. The bonding neck of each sample was then measured by using a scanning electron microscope(SEM)， and a theoretical model of the bonding neck was established. The results showed that the processing parameters have a certain effect on the sample’s bonding neck. If the printing speed is appropriately reduced or the extrusion temperature， extrusion width， layer thickness and filling rate are increased， the bonding neck will be increased， but the improvement effect is limited， which proves that the model is accurate and reliable.