喷头流道结构参数对高黏度含能材料直写成型3D打印挤出过程稳定性影响

Influence of Nozzle Structure Parameters on the Stability of DIW 3D Printing Extrusion Process

为了研究直写成型技术(DIW)中挤出系统的喷头流道结构参数(锥角角度、出口直径、成型段长度)对含能材料挤出过程的流体流动影响,研究建立了基于Polyfow Extrusion模块的高黏度含能材料挤出模型,并采用直写成型3D打印工况的挤出实验对其进行了验证。研究通过所建立的模型分析了锥角角度范围90°~130°,出口直径0.75~2 mm以及成型段长度5~20 mm对高黏度含能材料挤出过程的影响。结果表明:采用Polyflow Extrusion模块可以较准确地模拟复合含能材料的流动行为,同时发现锥角为100°、喷头出口直径为1.5~1.75 mm时挤出成型过程相对稳定、挤出膨胀较小,且成型段的增长会在增大所需入口压强的同时减小出口膨胀效应。

To study the effects of extrusion system nozzle runner structural parameters(cone angle,outlet diameter,and molding section length)on the fluid flow of energy‑containing material extrusion process in the direct‑in‑writing‑forming(DIW)technology,an extrusion model of high‑viscosity energy‑containing materials based on the Polyflow Extrusion module was established,and was verified by extrusion experiments under the working conditions of direct‑write 3D printing.The study analyzed the effects of cone angle range(90°-130°),outlet diameter(0.75-2 mm),and molding section length(5-20 mm)on the extrusion process of high‑viscosity energy‑containing materials through the established model.The results show that the Polyflow Extrusion module can accurately simulate the flow behavior of composite energy‑containing materials.When the cone angle is 100°,and the nozzle outlet diameter is between 1.5 mm and 1.75 mm,the extrusion process is relatively stable with small extrusion expansion.Additionally,as the length of the molding section grows,the required inlet pressure increases while the outlet expansion effect decreases.