摘要
回转体结构复杂型面镁合金壳体构件是具有变厚度、变曲率、小尺寸等特征,常规超声波检测方法存在耦合不良、全覆盖扫查难以控制和缺陷定量、定位精度差等问题。为了满足大批量、高效率、高精度的检测要求,研制了相应的超声波自动检测系统。设计了一种基于6自由度工业机器人结合转盘的高速、螺旋式扫查方案;通过多闸门与动闸门组合的方法解决复杂结构扫查成像难题;研究了基于不同曲率入射的镁合金构件规则反射体预测DGS(距离-波幅-当量)曲线的缺陷精确定量方法;提出了一种基于被检件表面标记线识别的缺陷定位方法,解决回转类工件螺旋C扫描检测过程中缺陷定位难题。对比试块的扫描实验结果表明,可实现工件内部最小Ф0.8 mm的人工平底孔缺陷有效检测,定量误差均小于0.3 mm当量直径,定位误差小于0.5 mm。
The complex surface magnesium alloy shell is a rotating body with the characteristics of variable thickness, variable curvature and small size. Conventional ultrasonic testing methods have some problems, such as poor coupling, difficult full coverage scanning, poor defect quantification and positioning accuracy. In order to meet the requirements of high efficiency and high precision detection of large quantities of workpieces, the corresponding ultrasonic automatic detection system was developed. A high-speed and spiral scanning method based on 6-DOF Robot combined with turntable was proposed;through the combination of multiple gates and moving gates, the problem of scanning and imaging of complex structures was solved;Based on the ultrasonic measurement model of magnesium alloy, the DGS(Distance-Gain-Size) curve cluster of regular reflector in magnesium alloy components with different curvature incidence was obtained to realize the accurate quantification of internal defects;a defect location method based on the identification of the mark line on the surface of the specimen was proposed to solve the problem of defect location in the process of spiral C-scan detection of rotating work pieces. The scanning test of the specimen verifies that the minimum 0.8 mm artificial flat bottom hole defect can be detected effectively, the quantitative error is less than 0.3 mm equivalent diameter, and the location error is less than 0.5 mm.
作者
张荣繁
倪培君
李红伟
李雄兵
左欣
付康
ZHANG Rongfan;NI Peijun;LI Hongwei;LI Xiongbing;ZUO Xin;FU Kang(The Ningbo Branch of Ordnance Science Institute of China,Ningbo 315103,China;CAD/CAM Institute,Central South University,Changsha 410075,China)
出处
《兵器装备工程学报》
CAS
CSCD
北大核心
2022年第10期249-256,共8页
Journal of Ordnance Equipment Engineering
基金
浙江省基础公益研究计划项目(LGG20E010001、LGC19E010001)
国家自然科学基金项目(9206011)
宁波市科技服务示范项目(2020F039)。
关键词
镁合金构件
缺陷
超声波自动检测
magnesium alloy components
defects
ultrasonic automatic detection
作者简介
张荣繁(1991—),男,助理研究员,E-mail:zhangrfbtxf@163.com。
