低熔点合金/高分子复合结构同轴3D打印方法研究

Coaxial 3D-Printing for Low Melting-Point Alloy and Polymer Composites

针对金属/高分子异质材料一体3D打印成型的问题,设计了一种面向低熔点合金(LMPA)与高分子复合材料成型的3D打印设备。以活塞挤出驱动及双加热系统为基础,通过嵌套式同轴挤出喷头,实现LMPA与多种高分子材料的一体连续打印,从而制备较高力学强度的复合打印构件。此外,通过有限元方法对挤出压力、温度、速度等工艺参数进行了模拟仿真,并结合试验探索了打印速度、打印温度、流体黏度等参数对材料成型状态的影响,初步实现对打印工艺的优化。最后设计并打印制备了可变刚度的功能构件,并测试了相关减振性能,对LMPA/高分子复合功能结构的同轴3D打印提供了可参考的方案。

In order to develop the process of metal/polymer 3D printing,a coaxial 3D printing device for molding low melting-point alloys and polymer composites was designed.Driven by a piston extruder and heated with heating systems,alloys and polymer composites are extruded through the nested coaxial nozzle,thus continuously integrated and molded into 3D printed composite components with better mechanical properties.In addition,the process parameters such as extrusion pressure,temperature and speed are simulated by finite element method and the influence of printing speed,temperature,viscosity and other parameters is explored under experiments to optimize the printing process.Finally,the feasibility of such device and process is verified in practice,which exhibits a possible method for the 3D printing of low melting-point alloy and polymer composites.