作者：尤睿琦, 张超, 郝刚

作者单位：天津理工大学计算机科学与工程学院，天津 300384

关键词：三维点云;螺纹锥度;检测方法;逆向工程

摘要：

为控制检测成本降低螺纹检测过程中对夹具及环境要求，该文在确保检测精度的前提下提出使用非接触式结构光点云对螺纹锥度的高精度测量方法。首先提出局部螺纹点云摆正方法并应用平面分割提取点云轮廓线，接下来在对不同角度获取的螺纹点云分类讨论聚类方法的同时建立轮廓点类别与锥度拟合点之间的数学模型，最终总结并分析螺纹锥度的测量精度并将其与设计精度及实际精度进行对比。对比结果显示多次实验中所测螺纹锥度平均误差均低于0.05°。该方法的提出可为各种形制螺纹锥度的三维逆向测量提供新方法。

High precision thread taper measurement method based on point cloud
YOU Ruiqi, ZHANG Chao, HAO Gang
School of Computer Science and Engineering, Tianjin University of Technology, Tianjin 300384, China
Abstract: In order to control the inspection cost and reduce the requirements of fixture and environment in the process of thread inspection, the authors propose a high-precision measurement method of thread taper using a non-contact structured light point cloud under the premise of ensuring the inspection accuracy. First, a local thread point cloud correction method is proposed and plane segmentation is applied to extract the point cloud contour line. Next, the thread point cloud obtained from different angles is classified and the clustering method is discussed. At the same time, the mathematic model between the contour point category and the taper fitting point is established. Finally summarized and analyzed the measurement accuracy of thread taper and compared it with the design accuracy and actual accuracy. The comparison results show that the average error of the thread taper measured in multiple experiments is less than 0.05°. The proposed method can provide a new method for the three-dimensional reverse measurement of the taper of various shaped threads.
Keywords: 3D point cloud;thread taper;detection method;reverse engineering
2022, 48(2):34-40  收稿日期: 2021-03-30;收到修改稿日期: 2021-05-03
基金项目:
作者简介: 尤睿琦(1997-),男,内蒙古包头市人,硕士研究生,专业方向为3D机器视觉、智能识别与图像处理
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