关键词: 增材制造, 材料挤出, 功能梯度材料, 路径规划策略

Abstract: Since additive manufacturing technology is based on the properties of discrete stacking molding,it is considered to be an effective method for fabricating functionally graded materials.The material extrusion process has gradually become a research hotspot due to its advantages of convenient operation and material saving.In view of the fact that the path planning strategy for printing functionally graded materials by this process has been less studied by scholars at home and abroad,the delay phenomenon during the material component transition of the material extrusion process was analyzed.The delay was divided into “delivery delay” and “transition delay”,and a printing strategy was proposed to compensate for the delay phenomenon based on the offset distance.Visual Studio 2019 was used as the development platform to propose a new path planning strategy for automatically generating arbitrary functionally graded materials print paths,which considered the variation of material components within each layer slice and generated corresponding printing paths for different variation directions to ensure minimal variation of material components during the printing process and thus improve the material accuracy of the molded parts.The generated print paths were demonstrated by simulation with multiple functional gradient models,their material component error analysis was visualized using OpenGL,and the superiority of the path planning strategy was experimentally verified.

Key words: additive manufacturing, material extrusion, functionally graded materials, printing paths strategy