Abstract:  In the forging processes, the radial section size data greatly affected the forging accuracy of ring forgings. Because of the complexity of forging environments and the high intensity noise interference, the amount of scanning data was very large. The accuracy of the radial dimensions measured from these scanning data was low. Therefore, a new measuring method for radial section sizes of ring forgings was proposed based on laser scanning. Firstly, the information space sets of laser scanning data were established, then, this information space was divided by continuous concentric circles. Secondly, according to the information relationship between the various areas in the information space, the gradient descent method was combined with the uniform continuous coefficients to solve the undetermined coefficients. Thirdly, the reduction ratio was set according to the density of scanning data points. By combining the reduction ratio with the undetermined coefficients, the number of points needed to be reserved in each area of a concentric circle was determined. The remaining points and the repetitive points in the intersection of two concentric circles were deleted. Finally, the method was repeated to traverse the laser scanning data, so as to process the laser scanning data of the radial sections for the ring forging. The method was applied in the experiments. The dimension data of the radial sections were extracted from the processed data of the laser scanning radial section line. The dimensions measured from the unprocessed and processed data points were compared with the true values. The dimensions measured from the processed data have higher accuracy and smaller errors. The feasibility of the proposed method is proved.

Key words: laser scanning, ring forgings, information space set, uniform continuous coefficients, radial section size

摘要： 在环形锻件环轧成形过程中，径向截面尺寸数据在很大程度上影响着环形锻件的锻造精度。由于轧制环境的复杂性以及高强度的噪声干扰，扫描数据量很大，据此测量得到的径向尺寸精度较低，因此，提出了一种环形锻件径向截面尺寸测量新方法。对激光扫描数据建立信息空间集合，并以连续的同心圆划分信息空间；根据信息空间内各区域间的信息关系，引入一致连续性系数并结合梯度下降法来求解待定系数；根据扫描数据点密度设定精简比率，结合精简比率与待定系数来确定每一同心圆各部分需要保留的点数，删去其余点及两同心圆相交部分的重复点；重复上述方法遍历激光扫描数据，对环形锻件的径向截面激光扫描数据进行处理。将该测量方法应用在实验中，从处理后的激光扫描径向截面形线数据中提取径向截面各尺寸数据，将处理前后所测得的数据与真实值进行对比，发现处理后得到的数据精度更高，误差更小，证明了该方法的可行性。

关键词: 激光扫描, 环形锻件, 信息空间集合, 一致连续性系数, 径向尺寸