基于成本和性能的3D打印填充模式实验研究

Experimental research on infill pattern of 3D printing based on costs and performance

新工科背景下,3D打印技术正逐渐成为高校工程训练中心先进制造技术实践教学模块的必修课程。为了降低实训成本和提高打印件质量,该文研究了填充模式对3D打印试制件材料消耗、成形时间和力学性能的影响。结果表明:填充模式对3D打印试件成形成本、效率及质量产生了不同程度的影响。当填充模式为Linear时,成形速度快,效率高;填充模式为Hexagonal时,打印耗材少、成本低。力学性能试验表明试制件内部孔隙缺陷和微观结构差异化是影响其压缩性能和拉伸性能的主要原因。填充模式为Dount时,试制件内部结构紧密,孔隙率最低,其压缩强度可达到55.5MPa;而当填充模式为Diamond时,试制件内部丝材堆叠方向与轴向拉伸方向呈45°,承载时有利于应力的分散和传递,故其拉伸强度和断裂延伸率俱佳,分别可达到18.5 MPa和3.9%。

Under the background of new engineering,3D printing technology is gradually becoming a compulsory course for the practical teaching module of advanced manufacturing technology in engineering training center of colleges and universities.In order to reduce the training cost and improve the quality of printing parts,this paper investigates the influence of infill pattern on the material consumption,forming time and mechanical properties of 3D printing trial parts.The results show that the infill pattern has different effects on the cost,efficiency and quality of 3D printing trial parts.When the infill pattern is Linear,the forming speed is fast and efficient,and when the infill pattern is Hexagonal,the printing consumables are less and the cost is low.The mechanical property tests show that the internal pore defects and microstructural differentiation of the trial parts are the main reasons that affect the compression and tensile properties.When the infill pattern is Dount,the internal structure of the trial part is tight and the porosity is the lowest,and its compressive strength can reach 55.5 MPa.When the infill pattern is Diamond,the stacking direction of the inner wires is 45°to the axial stretch direction,which is beneficial to the dispersion and transmission of stress when carrying the load,so the tensile strength and elongation at break are both excellent,which can reach 18.5 MPa and 3.9%respectively.