摘要
激光熔化沉积零件制造及使用过程中容易产生缺陷,电涡流检测是一种非接触检测方法,针对表面及亚表面缺陷具有很高的检测灵敏度,易于实现自动化检测,在增材制造领域极具应用前景。通过有限元仿真技术建立无缺陷TC4钛合金增材样件电涡流检测模型,模拟电涡流检测过程中电场强度的分布规律,研究激励频率、提离量对电涡流检测信号的影响。研究发现,针对样件内不同深度的位置激励频率存在最佳区间,而提离量则应尽可能采用较小值。采用激光熔化沉积技术制备了含有亚表面缺陷的TC4钛合金试验样件,用于电涡流检测试验测试,将电涡流检测设备与机器人集成,采用机器人做执行机构来保证提离量及运动的平稳性,最终获得的试验结果与仿真结果具有较好的一致性。
Parts produced by laser melting deposition are prone to defects during the manufacturing and service.Eddy current testing is a non-contact testing method,which has high detection sensitivity for surface and sub-surface defects and is easy for automatic detection,so it has a great application prospect in the field of additive manufacturing.A defect-free additive manufacturing model of TC4 titanium alloy was established for eddy current testing by finite element simulation technology,and the distribution of electric field intensity during eddy current testing was simulated,and then,the influence of excitation frequency and lift-off distance on eddy current testing signal is studied.It was found that there is an optimal range for the excitation frequency at different depths in the sample,and the lift-off distance adopted should be as small as possible.Then a TC4 titanium alloy sample with subsurface defects were prepared by laser melting deposition technology for eddy current testing experiments.The eddy current testing equipment was integrated with a robot,and the robot was used as the actuator to ensure the lift-off distance and the movement stability.Finally the test results were in good agreement with the simulation results.
作者
赵宇辉
赵吉宾
李明玥
何振丰
王志国
贺晨
ZHAO Yuhui;ZHAO Jibin;LI Mingyue;HE Zhenfeng;WANG Zhiguo;HE Chen(Shenyang Institute of Automation,Chinese Academy of Science,Shenyang 110016;Institutes for Robotics and Intelligent Manufacturing,Chinese Academy of Science,Shenyang 110169;School of Materials Science and Engineering,Shenyang University of Technology,Shenyang 110870)
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2024年第14期34-41,共8页
Journal of Mechanical Engineering
基金
国家自然科学基金(52105415)
国防科技重点实验室基金(JCKY61420052017)
广东省基础与应用基础研究基金(2020B1515120027)资助项目。
关键词
激光熔化沉积
电涡流检测
有限元仿真
TC4钛合金
亚表面缺陷
laser melting deposition
eddy current testing
finite element simulation
TC4 titanium alloy
subsurface defects
