摘要
激光粉末床熔融(laser powder bed fusion,LPBF)成形悬垂结构的应力与变形是实现复杂金属构件高质量、高精度制造的关键问题之一。通过基体预埋应变片的方式实现了悬垂结构LPBF成形过程应变数据的实时测量。基于原位应变测量系统研究了T形悬垂结构、低角度悬垂结构(5°和10°)LPBF过程的原位应变行为。深入研究了不同悬臂长度、不同成形工艺参数对T形悬垂结构原位应变行为的影响,并进一步分析了不同悬垂角度、支撑类型对低角度悬垂结构原位应变行为的影响。结果表明,T形悬垂结构的悬空长度越长,结构的变形越大;采用激光能量梯度、棋盘扫描策略可有效降低T形悬垂结构的变形。支撑结构设计可显著影响低角度悬垂结构的应变行为和成形质量,采用H1支撑设计策略(块体支撑间距0.8 mm+锥体支撑间距0.6 mm)的成形质量最佳。上述结果可为深入理解LPBF成形悬垂结构的变形行为和调控提供有效参考。
The stress and deformation of overhanging structures in laser powder bed fusion(LPBF)are critical issues for achieving high-quality and high-precision manufacturing of complex metal components.Real-time strain data measurement during the LPBF process of overhanging structures was achieved by embedding strain gauges in the substrate.Based on the in-situ strain measurement system,the strain behavior of T-shaped overhanging structures and low-angle overhangs(5°and 10°)during the LPBF process was investigated.The effects of different cantilever lengths and various process parameters on the in-situ strain behavior of T-shaped overhangs were analyzed in detail.Furthermore,the influence of different overhang angles and support types on the in-situ strain behavior of low-angle overhanging structures was analyzed.The results indicate that the longer the overhanging length of the Tshaped structure,the greater the deformation.The use of a laser energy gradient and island scanning strategy effectively reduces the deformation of T-shaped overhanging structures.Additionally,the design of the support structure significantly affects the strain behavior and forming quality of low-angle overhanging structures.The optimal forming quality is achieved using the Hl support design strategy(block support spacing of 0.8 mm and conical support spacing of 0.6 mm).These findings provide valuable insights for understanding and controlling the deformation behavior of overhanging structures in the LPBF process.
作者
王迪
李扬
刘林青
王天宇
谭华
陈来柱
陈文龙
杨永强
WANG Dil;LI Yang;LIU Linqing;WANG Tianyu;TAN Hua;CHEN Laizhu;CHEN Wenlong;YANG Yongqiang(School of Mechanical and Automotive Engineering,South China University of Technology,Guangzhou 510641,China;State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi'an,710072,China;Beijing Hangxing Machinery Co.,Ltd.,Beijing 100013,China)
出处
《粉末冶金工业》
北大核心
2025年第4期15-29,共15页
Powder Metallurgy Industry
基金
国家重点研发计划资助项目(2022YFB4600303)
国家自然科学基金资助项目(52073105)。
关键词
激光粉末床熔融
原位应变测量
悬垂结构
变形行为
变形
laser powder bed fusion
in-situ strain measurement
overhanging structure
deformation behavior
deformation
作者简介
王迪(1986-),男,博士,教授,主要研究方向为金属增材制造;通信作者:刘林青(1996-),男,博士,主要研究方向为异质材料激光粉末床熔融。
