摘要
为解决板料成形回弹预测困难、CAE模拟软件精度不高、回弹量难于精确测量,以及实际误差无法全面估计等问题,提出了一种非接触式三维光学测量板料回弹的方法.该方法由近景摄影测量系统和面扫描系统组成,摄影测量系统可以计算出工件表面粘贴的编码点和非编码点,导出全局标志点.面扫描系统利用全局标志点,扫描时可以实现每幅点云的自动拼接,精确采集物体表面的三维数据,经反求获得工件数模.与模具型腔三维CAD数模相比,该方法能精确获得钣金件与模具各点的差值,并作为零件的回弹量,为修模时的几何补偿提供参考依据.以汽车车门为例,结合实验数据,证明了该方法具有较高的测量精度,可以比较方便地测量板金件的回弹量.
Facing the problems in forming process, such as difficult springback prediction, low accuracy of CAE simulation software, and difficulty in estimating fact error entirely, a non-contact 3D optical measuring method with digital close-range industrial photogrammetry technology and surface scanner technology is proposed, where un-coded point and coded-point fixed on the surface of parts may be figured out and the whole marked-points is exported via photogrammetry system. The surface scanner system makes use of the global marked points, hence every pieces of point data may be assembled automatically. Then 3D data of the object surface and CAD model of workpieces are acquired precisely. Contrasted with CAD model of die, the errors between workpiece and CAD model can be obtained with the present method as the springback values of workpiece to provide a geometric compensation for finishing die. An automobile door is taken as an example, and the experiment verifies the accuracy of the proposed springback measurement method.
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2009年第9期51-55,共5页
Journal of Xi'an Jiaotong University
基金
国家高技术研究发展计划资助项目(2007AA04Z124)
江苏省科技支撑计划资助项目(BE2008058)
关键词
摄影测量
回弹
面扫描
精度
photogrammetry
springback
surface scanner
precision
