增材制造对称零件的悬垂特征结构提取方法研究  

Feature Extraction Method of Overhanging Structure of Symmetric Parts by Additive Manufacturing

作　　者：陈宾宾 姜献峰[1,2] 董星涛[1,2] Chen Binbin;Jiang Xianfeng;Dong Xingtao(College of Mechanical Engineering,Zhejiang University of Technology,Hangzhou,Zhejiang 310023,China;Key Laboratory of Special Purpose Equipment and Advanced Processing Technology,Ministry of Education and Zhejiang Province,Zhejiang University of Technology,Hangzhou,Zhejiang 310023,China)

机构地区：[1]浙江工业大学机械工程学院,浙江杭州310023 [2]浙江工业大学特种装备制造与先进加工技术教育部/浙江省重点实验室,浙江杭州310023

出　　处：《应用激光》2021年第5期985-990,共6页Applied Laser

摘　　要：增材制造技术生产的零件结构复杂,通常兼具悬垂特征结构和对称结构。为了保证对称结构的机械性能,同时避免悬垂特征结构造成的成形缺陷,成形前需要从零件模型中提取特征结构进行特殊工艺控制。结合零件模型的切片分层特点和STL模型的网格信息,提出一种悬臂倾斜角的计算方法,高效地识别悬垂区域;设计空间曲面包围盒精确提取特征结构,并在三维建模软件下实现操作。最后选择典型的对称零件验证方法,并采用SLM增材制造技术打印出有较好成形质量的零件,结果表明该方法具有可行性和有效性,能提高零件的处理能力,并改善成形质量。The structure of parts produced by additive manufacturing(AM) technology is complex, and usually with overhanging feature structure and symmetric structure. To ensure the mechanical property of symmetric structure and avoid the molding defects caused by overhanging feature structure, it is necessary to extract the feature structure from the part model for special process control before molding. This paper combines the layer upon layer characteristics of part model and the grid information of STL model, then proposes a calculation method of the cantilever inclination angle to effectively identify the overhanging area;and design the box of space surface to accurately extracts the structure and accomplish the operation by 3 D modeling software. Finally, a typical symmetric part verification method is selected, and printed it out with better molding quality by SLM additive manufacturing technology. The results show that the method is feasible and effective, and improve the processing capacity and formed quality of parts.

关 键 词：增材制造 悬垂结构 区域识别 对称零件 STL模型 

分 类 号：TH164[机械工程—机械制造及自动化]