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

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