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超塑性自由胀形实验中准确测量胀形件轮廓曲面以及曲面上各点的变形是建立超塑性自由胀形解析理论的重要基础.本工作依据自由胀形件轮廓为轴对称旋转曲面这一重要特征,将曲面测量问题转化为曲面上特征点的测量,采用双目立体视觉系统测量特征点的三维坐标,并进行曲线拟合以确定其轮廓曲面,计算几何参数,通过分析轮廓曲面上特征点位置变化以及两相邻特征点之间间距的变化来测量应变.介绍了双目立体视觉系统的组成和测量方法,以及系统模型、标定方法、消除高温影响和图像处理等关键环节,给出了胀形件几何参数和变形测量的方法,进行了测量实验.
The accurate measurement of the profiled surface and the deformation of the points on the surface in the superplastic free bulging experiment is an important basis for the establishment of the analytical theory of the superplastic free bulge.This work is based on the important point that the contour of the free bulge is the axisymmetric rotating surface Feature, the surface measurement problem is transformed into the measurement of feature points on the surface, the binocular stereo vision system is used to measure the three-dimensional coordinates of the feature points, and the curve fitting is performed to determine the profile surface and calculate the geometric parameters. By analyzing the feature points The change of position and the change of the distance between two adjacent feature points to measure the strain.This paper introduces the composition and measuring method of binocular stereo vision system and the key parts such as system model, calibration method, eliminating high temperature influence and image processing, Bulge geometric parameters and deformation measurement methods, conducted a measurement experiment.