熔融沉积成型工艺参数对聚乳酸制件力学性能的影响

采用熔融沉积成型的方法对聚乳酸(PLA)进行3D打印,以拉伸强度和拉伸弹性模量为指标,首先通过单因素实验研究了打印温度、层高和打印填充路径对PLA打印制件力学性能的影响,在此基础上选择了这三个参数的三个水平,进行了三因素三水平的正交实验,并对正交实验的结果进行了极差分析和灰色关联度计算。结果表明,对PLA制件拉伸强度和拉伸弹性模量影响程度最大的为层高,其次为打印填充路径,打印温度的影响程度最小;当打印温度为200℃,层高为0.1 mm,并按照制件XYZ方向打印同时采用45°/45°线填充路径时,成型的PLA制件的拉伸性能最好,拉伸强度和拉伸弹性模量分别可达到47.2 MPa和1 622 MPa。

Influences of FDM Process Parameters on Mechanical Properties of PLA Parts

3D printing of polylactic acid(PLA)was done by fused deposition modelling(FDM),taking tensile strength and tensile modulus as indexes,the influences of printing temperature,layer thickness and printing filling path on the mechanical properties of the PLA materials were studied through single factor experiments.Based on these,3 levels of each factor were selected in the orthogonal experiments and range analysis and grey relational analysis were conducted based on the experimental results.In conclusion,layer thickness influences the mechanical properties the most significantly,followed by printing filling path and then printing temperature.When the printing temperature is 200℃,layer thickness is 0.1 mm and the PLA part is printed according to XYZ direction and by using 45°/45°line filling path,the highest tensile strength and modulus are achieved,which are 47.2 MPa and 1 622 MPa respectively.