摘要
为快速、准确测量大型零件大跨度孔的同轴度误差,设计了对侧布置的线激光扫描四目视觉测量系统,通过两套视觉测量单元分别采集两孔端面点云数据,进一步拟合端面圆心和端面法线,得到两个独立的单侧孔轴线。提出了大跨距无公共视场视觉系统标定方法,设计了多标定板相固连的靶标,通过4块标定板的位姿关系传递,得到两套视觉测量单元的坐标系转换关系,实现了两侧孔测量数据的坐标系统一。精度验证实验表明,该系统对于1.15 m跨距的标准球组球心距测量均方根误差为0.161 mm。使用该系统对一压路机振动轮两侧轴承孔的同轴度进行了测量,并与三坐标测量机的测量结果进行了对比,结果表明两者测量结果偏差小于5%,测量精度能够满足工业生产需求。
A vision-based measurement(VBM)system composed of two oppositely placed VBM units is designed to rapidly and accurately measure the coaxiality error of large-scale parts with long-span holes.The VBM unit is a line laser scanning stereo vision system,and two VBM units are used to obtain the point clouds of the end faces of the two holes.The two-point clouds are then used to calculate the centers of the circles and the normal directions on the end faces,respectively,as well as the two hole axes.The calibration method,using a specially designed target made up of four fixedly connected calibration boards whose position and orientation relations are accurately calibrated beforehand,is proposed to realize the unification of the coordinate systems of the two VBM units.These two independent axes are then merged into a common coordinate system.Finally,the coaxiality evaluation parameters are given.The accuracy verification experiment shows that the RSME of the center distance of the standard ball set with 1.15 m span is 0.161 mm.The proposed system is applied to measure the coaxiality of the bearing holes on both sides of the vibrating wheel of a roller,and the results are compared with those of the CMM.Results show that the deviation of the two measurement results is less than 5%,and the measurement accuracy can meet the needs of industrial production.
作者
张国锋
杨树明
胡鹏宇
邓惠文
段宇
Zhang Guofeng;Yang Shuming;Hu Pengyu;Deng Huiwen;Duan Yu(State Key Laboratory for Manufacturing Systems Engineering,Xi'an Jiaotong University,Xi'an 710049,China)
出处
《仪器仪表学报》
EI
CAS
CSCD
北大核心
2022年第9期219-226,共8页
Chinese Journal of Scientific Instrument
基金
陕西省重点研发计划项目(2021GXLH-Z-029)资助。
关键词
大跨距孔
同轴度
视觉测量
系统标定
线激光扫描
long-span holes
coaxiality
vision-based measurement
system calibration
line laser scanning
