基于SLM工艺的航空支架优化设计  

Optimal Design of Aero Support Based on Selective Laser Melting

作　　者：王旭葆[1] 曲波[1] WANG Xubao;QU Bo(Institute of Laser Engineering, Beijing University of Technology, Beijing 100124, China)

机构地区：[1]北京工业大学激光工程研究院,北京100124

出　　处：《航空制造技术》2017年第20期68-72,78,共6页Aeronautical Manufacturing Technology

摘　　要：激光选区熔化(SLM)是一种通过使用激光熔化金属粉末层成形的增材制造工艺,没有传统工艺的设计约束。但基于SLM的结构设计也需遵循一定的设计规则,从而兼顾效率、成本和成形稳定性。本文对轻量化航空铝合金支架的SLM工艺性进行分析,包括成形时间、消耗、后处理难度和稳定性。后结合SLM成形特点对原始结构进行重新设计,研究更复杂结构的机械性能和SLM工艺性,得到一个优化结构。优化结构重量减轻24.5%,工况加权刚性提升38.3%,位移量最大减少32.7%,在缩放系数为0.5的条件下,成形时间减少38.6%,材料用量大幅减少65.6%,优化结构没有内部支撑,后处理难度得以降低,整体成形稳定性提升明显。Selective Laser Melting(SLM)is an additive manufacturing technology that is based on melting layers of metal powder using powerful laser without traditional limits.Considering efficiency,cost and stability,some specific rules should be complied with in process of the structure design.In this article,SLM specialty of the aero aluminum alloy support was analyzed including total time,expenditure,difficulty in post-process and stability.Then the original structure was redesigned combined with SLM specialty.Complex of the structure was studied involving performance and SLM manufacturing.An optimal structure was obtained that the weight reduced by24.5%,weighting stiffness increased by38.3%,displacement reduced by32.7%at most.Total time evaluated reduced by38.6%,material consumption reduced by65.6%dramatically at scale coefficient of0.5.There were no supports inside the optimal structure,the post-process was easier,and fabricating stability was significantly improved.

关 键 词：激光选区熔化 轻量化 优化结构 成形稳定性 支撑 

分 类 号：TG665[金属学及工艺—金属切削加工及机床] V261[航空宇航科学与技术—航空宇航制造工程]