基于螺杆泵送料的陶瓷三维打印机挤出机理

微流挤出堆积成形精度主要受打印材料和工艺参数的影响。为了提高陶瓷制件的打印精度，采用螺杆泵输送浆料，以保证浆料连续进给、压力恒定，实现非连续打印；对打印材料进行流变特性分析，根据打印平台结构参数计算挤出速度与流量；最后，建立数学模型，将材料流变特性与平台运动参数合理匹配，并进行了相关实验。实验结果与理论计算结果相一致，验证了送料机构与该数学模型可提高打印精度。

Extrusion Mechanism of Ceramic 3D Printer Based on Screw Pump Feeding

The precision of micro-flow extrusion was mainly influenced by printed materials and processing parameters. In order to improve the printing precision of ceramic parts, a screw pump was adopted to transport the slurry to ensure continuous feeding of slurry and constant pressure and to realize discontinuous printing. Then, the rheological characteristics of the printing materials were analyzed, and the extrusion speed and flow were calculated according to the structure parameters of the printing platform. Finally, the mathematical model was established, and the rheological properties of the materials were matched with the motion parameters of the platform reasonably. Relevant experiments were carried out. The experimental results are consistent with the theoretical calculation ones, which verifies that the feeding mechanisms and the mathematical model may improve the printing accuracy.