基于选区激光熔化技术的空心变截面梁点阵建模与性能研究  

Modeling and performance study of lattice modeling of hollow variable section beam based on selective laser melting technology

作　　者：张朝瑞 钱波 张立浩 ZHANG Chaorui;QIAN Bo;ZHANG Lihao(School of Mechanical and Automotive Engineering,Shanghai University of Engineering Science,Shanghai 201620,China)

机构地区：[1]上海工程技术大学机械与汽车工程学院,上海201620

出　　处：《农业装备与车辆工程》2024年第1期120-124,共5页Agricultural Equipment & Vehicle Engineering

基　　金：国家重点研发计划“面向增材制造的模型处理以及工艺规划软件项目”(2018YFB1105300);普适性全维度数字模型课题(2018YFB1105301)。

摘　　要：针对点阵结构受力不均、材料分布不合理和功能性单一等问题,设计了一种空心变截面梁点阵。该点阵主要由空心变截面梁和无冠空心球体组成,优化了节点连接方式,改善了材料分布,相比于传统体心立方点阵更具优势。完成了空心变截面梁点阵结构几何分析,基于点阵的几何数据模型和铁木辛柯梁理论推导了点阵结构参数与相对密度和力学性能之间的函数关系。设计了单胞边长10 mm空心变截面梁点阵,在同一相对密度、不同曲率半径的变截面梁点阵进行了准静态压缩仿真模拟,采用选区激光熔化技术制备了变截面梁点阵,进行了形貌分析和准静态压缩试验。结果表明:压缩仿真结果与实验结果趋势吻合,空心变截面梁点阵相比于传统体心立方点阵性能更优,外轮廓曲率半径为4 mm时力学性能最优,相比于普通点阵承载能力提高43%;变截面梁外轮廓及内孔光洁度较高,扫描提取模型与原模型相比偏差在0.25 mm以内。Aiming at the problems of uneven force,unreasonable material distribution and single function of the lattice structure,a hollow variable section beam lattice was designed.The lattice was mainly composed of hollow variable section beam and crownless hollow sphere,which optimized the node connection mode and improved the material distribution.Compared with the traditional body center cubic lattice,it had many advantages.The structural geometric analysis of hollow variable section beam points was completed,and the functional relationship between lattice structural parameters and relative density and mechanical properties was derived based on the geometric data model of lattice and Timoshenko beam theory.A hollow variable section beam lattice with a single cell side length of 10 mm was designed and subjected to quasi-static compression simulation on a variable cross-section beam lattice with the same relative density but different curvature radii.The variable cross-section beam lattice was prepared using selective laser melting technology,and the morphology analysis and quasi-static compression test were carried out.The results showed that the compression simulation results were consistent with the trend of experimental results,and the hollow variable section beam lattice had better performance than the traditional body-centered cubic lattice,and the mechanical properties were the best when the radius of curvature of the outer contour was 4 mm,and the bearing capacity was increased by 43%compared with the ordinary lattice.The outer contour and inner hole finish of the variable section beam were high,and the deviation of the scanning extraction model was within 0.25 mm compared with the original model.

关 键 词：增材制造 点阵结构 选区激光熔化 空心变截面梁 

分 类 号：U462.3[机械工程—车辆工程]