异形热态锻件几何尺寸测量方法的研究

提出一种异形热态锻件几何尺寸测量方法。基于线激光器、CCD和伺服系统构建线激光扫描测量系统，通过提取图像上被锻件表面轮廓调制的激光条纹二维信息，经过坐标变换及点云三维重构得到锻件三维尺寸信息。针对被测异形锻件形貌特征，建立基于摄像机运动的扫描测量模型，并提出一种基于棋盘参考平面的摄像机光心轨迹求解方法。根据平面上特征点在CCD图像不同帧中的坐标拟合摄像机的运动轨迹，结合扫描测量模型实现对异形锻件完整轮廓尺寸的测量。通过实验对封头进行扫描测量，得到球冠部分截面测量直径误差小于4 mm，满足热态锻件测量要求，验证了该方法的可行性。

Research on the Dimension Measurement Method for Special-shaped Hot Forgings

A geometry dimension measurement method for special-shaped forgings is proposed.The measuring system composed of a green line laser,a CCD camera and a servo system is established.Two dimension information of the laser stripe modulated by the forgings surface profile is extracted from the images.And further the size of the forgings is acquired through the reconstruction of point cloud after coordinate transformation.Aiming at the morphology feature of the special-shaped forgings,a math measuring model based on the CCD scanning is established and a solving method of the optical center motion trail is proposed based on the chessboard reference plane target.The optical center motion trail is solved by using the feature point coordinate of the reference plane on the different frames.The overall profile dimension is achieved according to the optical center motion trail and the math scanning measuring model.The experimental results of the spherical shell cover demonstrate that the measured diameter errors of spherical crown portion are less than 4 mm,meeting the requirement for the accurate measurement of the hot forgings.This method is feasible according to the experimental results.