【摘要】 目的研究FDM技术中路径规划对于成型件力学性能影响,找出力学性能最佳的路径规划方式,分析不同路径规划成型件之间力学性能差异的原因.方法以切片软件Slicr3中直线式、同心式、蜂窝式、希尔伯特曲线式、阿基米德曲线式路径规划方式为例,使用PRUSA型串联式3D快速成型机制备不同路径规划方式的实验试样,分别对各路径规划方式的试样进行了拉伸实验和弯曲实验;建立各路径规划试样理论模型,分析理论模型内部结构差异及计算各模型的内部材料覆盖面积;最终将力学实验结果和理论模型分析结果进行对比分析.结果得出同心式路径规划的试样力学性能最佳,其抗拉强度为44. 77 MPa、拉伸断后伸长率为4. 64%,弯曲强度为69. 87 M Pa;同心式路径规划试样的理论模型内部材料覆盖面积为18. 10 mm2,大于其他4种路径规划试样.结论成型件的力学性能和路径规划有着密切的关联,而造成各路径规划成型件之间力学性能差异的原因就是其内部材料覆盖面积的不同.更多还原

【Abstract】 To find out the best path planning for mechanical properties and analyze the reasons for the differences in mechanical properties among different path planning molded parts,the influence of path planning on the mechanical properties of FDMtechnology was studied. Linear,Concentric,Honeycomb,Hilbert curve and Archimedes curve path planning methods in the slicing software Slicer3 were taken as examples. The experimental samples of different path planning methods were made by the PRUSA type tandem 3D rapid prototyping machine,and the tensile test and bending test on the samples of each path planning method were carried out. The theoretical model of eachpath planning sample was established. The internal structure difference of the theoretical model was analyzed and the internal material coverage area of each model was calculated. Finally,the mechanical experimental results and theoretical model analysis results were compared and analyzed.The results showthat the mechanical properties of the sample with concentric path planning are the best,and its tensile strength is 44. 77 MPa,elongation after tensile break is 4. 64 %,and bending strength is 69. 87 MPa. The theoretical model of concentric path planning samples has an internal material coverage of 18. 10 mm,which is larger than the other four path planning samples. The conclusion is that the mechanical properties of the molded parts are closely related to the path planning,and the reason for the difference in mechanical properties among the molded parts in the path planning is the difference in the internal material coverage.更多还原