聚醚醚酮3D打印成形工艺的仿真和实验研究

Process Simulation and Experiments for PEEK 3D Printing Technology

为解决高性能医用聚醚醚酮(polyethoretheretherketone,PEEK)零件复杂结构难以加工的问题,采用基于熔融沉积原理的3D打印方式,辅以高温成形腔体结构,通过模拟仿真和工艺实验,开展PEEK的快速成形系统工艺研究。仿真结果表明:采用接近PEEK玻璃化温度的高温成形腔体环境,可以明显地减小PEEK试样的翘曲变形;采用较小内径的喷嘴,有利于PEEK丝材的熔化和熔融挤出稳定性。实验数据表明:喷嘴内径0.4 mm和打印层厚0.1 mm的设置条件下,PEEK试样的最高平均拉伸强度可达到74.74 MPa,接近传统注塑成形零件的拉伸性能。

The medical PEEK components with high performance were difficult to process because they displayed intricate structure.To deal with the problems,the research of PEEK RP was conducted based on the fused deposition modeling(FDM)3D printing technology.In particular,the design of high temperature chamber,analog simulation and process experiments were carried out accordingly.The simulation results show that the warping deformation phenomenon of PEEK sample may be greatly suppressed obviously through the applications of the prototyping chamber with the temperature close to the glass transition temperature of PEEK.Moreover,PEEK filament may melt uniformly through the applications of the nozzles with smaller diameters,which makes sure that the PEEK filament span steadily.The experimental data show that the highest average tensile strength of PEEK sample achieves about 74.74 MPa when using the nozzle diameter of 4 mm and the layer thickness of 0.1 mm during the PEEK 3D printing processes.The values are close to the tensile strength of the PEEK sample processed through the traditional injection molding.