Zhang Peng, Gao Qiang, Yu Kaicheng, Yao Yifeng, Lu Lihua
School of Mechatronics Engineering, Harbin Institute of Technology, Harbin 150001, China.
Chongqing Research Institute of HIT, Chongqing 400000, China.
Biomedicines. 2022 May 25;10(6):1233. doi: 10.3390/biomedicines10061233.
For the extrusion 3D printing process, the printing temperature has a significant impact on the filament formation process because the rheological properties of the printed materials are extremely thermal sensitive, which requires a high temperature control accuracy of the print head. This paper presents a numerical and experimental investigation on the temperature field of a homemade print head. A finite element simulation model for analyzing the temperature field of the print head was established, by which the temperature distribution inside the print head can be acquired. Moreover, to improve the temperature control accuracy, an improved configuration was proposed, and two schemes were compared. The temperature control error dropped from 28% to 6.2% with the improved print head, which was verified experimentally. Furthermore, printing trials were conducted by the optimized print head. The filament diameter could be regulated by changing the temperature of the print head, which validates the feasibility to control the filament diameter during the extrusion process via temperature regulation.
对于挤出式3D打印工艺，打印温度对长丝形成过程有重大影响，因为打印材料的流变特性对温度极为敏感，这就要求打印头具有很高的温度控制精度。本文对自制打印头的温度场进行了数值和实验研究。建立了用于分析打印头温度场的有限元模拟模型，通过该模型可以获取打印头内部的温度分布。此外，为提高温度控制精度，提出了一种改进的结构，并对两种方案进行了比较。改进后的打印头温度控制误差从28%降至6.2%，并通过实验得到了验证。此外，使用优化后的打印头进行了打印试验。通过改变打印头的温度可以调节长丝直径，这验证了在挤出过程中通过温度调节来控制长丝直径的可行性。
