砂型增材制造多轮廓自适应切片算法  

Multi-contour Adaptive Slicing Algorithm for Sand Mold Additive Manufacturing

作　　者：任洪稳 单忠德 杨浩秦 闫丹丹 孙玉成 REN Hongwen;SHAN Zhongde;YANG Haoqin;YAN Dandan;SUN Yucheng(College of Materials Science and Technology,Nanjing University of Aeronautics&Astronautics,Nanjing 211106,China;Weichai Power Co.,Ltd.,Weifang 261021,China)

机构地区：[1]南京航空航天大学材料科学与技术学院,南京211106 [2]潍柴动力股份有限公司,潍坊261021

出　　处：《南京航空航天大学学报》2024年第3期447-456,共10页Journal of Nanjing University of Aeronautics & Astronautics

基　　金：国家重点研发计划(2021YFB3401200);江苏省基础研究计划(自然科学基金)青年基金(BK20230885);装备预研专用技术项目(30104040302)。

摘　　要：为进一步实现砂型3D打印高效率和高精度成形,开展砂型输出立体光刻(Stereolithography,STL)模型法向量和单位化预处理研究,提取复杂结构多轮廓砂型内部轮廓,提出砂型3D打印每层三角面片单位法向量|Z|最大值的自适应分层厚度准则,实现兼顾沿打印方向和水平方向不同曲率轮廓STL模型高精度分层,最后基于MATLAB开发平台编写砂型多轮廓自适应测试程序,对复杂泵壳砂型/砂芯STL模型进行切片测试。实验结果表明,采用自适应切片算法可以显著提高砂型打印成形精度的同时提高成形效率,对砂型3D打印具有重要理论价值和工程意义。In order to further achieve high efficiency and high precision forming of sand 3D printing,the study investigates on normal vector and unitisation preprocessing of sand stereolithography(STL)model,extract the internal contour of multi-contour sand model of complex structure,and put forward the adaptive layering thickness criterion of the unit normal vector|Z|maximum of triangular faceted slice in each layer of sand 3D printing,so as to achieve the high-precision layering of the STL model taking into account of different curvature profiles in both the printing direction and the horizontal direction.Finally,based on the MATLAB development platform,we write a multi-profile adaptive test program for sand model,and carry out the slicing test on the complex pump casing sand/core STL model.The experimental results show that the adaptive slicing algorithm can significantly improve the forming accuracy of the sand printing and forming efficiency at the same time.The study has great theoretical value and engineering significance for sand 3D printing.

关 键 词：砂型3D打印 内外轮廓分型 自适应切片算法 STL模型 

分 类 号：TG234.6[金属学及工艺—铸造]