基于PAM自由成型的多喷头系统气动打印规律研究

发布时间：2018-02-19 22:50

本文关键词： 系统设计影响因素模拟挤出成型效果系统控制　出处：《华中科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：PAM(pressure assisted micro-syringe)气动式助推微注射器)自由成型技术是一种新型的3D打印技术,在复合生物材料支架制造上具有独特的优势。本文旨在对该系统气动打印技术进行研究,通过设计有效的打印回路,探索系统挤出成型规律;并通过使用软件模拟,研究成型过程中压强值,长径比以及材料粘度对成型效果的影响,并通过实际实验来进一步分析影响因素的作用并与模拟结论相验证与补充,从而探索出适合PAM技术的打印工艺,并应用于实际制造;最后本文对系统控制进行初步探索,设计了简单的系统控制程序。气动系统的设计决定了气动挤出时系统的稳定性与效率。本文通过对两种设计方案的比较,得出了合适的系统设计,同时验证了负压的设计效果,并根据设计讨论了流量值在挤出过程中对系统输出效果的影响。压强P,材料粘度m与针管的长径比dl影响挤出过程中材料的挤出性能。本文通过运用软件模拟挤出过程揭示了上述因素在打印过程中对材料挤出效果的影响,并针对各项因素进行了分析。材料在挤出后一个重要性能参数为挤出直径,直径大小直接影响到成型支架的生物性能。本文通过控制打印过程中的材料浓度与压强值,探索了材料成型过程中二者对成型效果的影响,并与模拟分析的结果相验证,得出了适宜材料成型的工艺参数。
[Abstract]:PAM(pressure assisted micro-syringe pneumatic booster microsyringe) is a new type of 3D printing technology, which has unique advantages in the manufacture of composite biomaterial scaffolds. The purpose of this paper is to study the pneumatic printing technology of this system. By designing an effective printing loop to explore the extrusion rules of the system, and by using software simulation, the influence of pressure, aspect ratio and material viscosity on the forming effect is studied. And through the actual experiment to further analyze the effect of the factors and verify and supplement with the simulation conclusion, so as to explore the printing process suitable for PAM technology, and apply it to the actual manufacturing. Finally, this paper makes a preliminary exploration on the system control. A simple system control program is designed. The design of pneumatic system determines the stability and efficiency of the system during pneumatic extrusion. By comparing the two design schemes, a suitable system design is obtained, and the design effect of negative pressure is verified. According to the design, the influence of flow value on the output effect of the system is discussed. Pressure P, material viscosity m and the ratio of length to diameter of needle tube affect the extrusion performance of the material during extrusion. In this paper, the extrusion performance is simulated by software. The process reveals the influence of the above factors on the extrusion effect of the material during the printing process. After extrusion, an important property parameter is extrusion diameter, which directly affects the biological properties of the molding scaffold. In this paper, the material concentration and pressure in the printing process are controlled. The influence of the two factors on the forming effect was explored, and the results of simulation and analysis were verified, and the suitable process parameters were obtained.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TP391.73;TB30

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