Surface warpage detection method based on point cloud feature comparison

doi:10.3785/j.issn.1008-973X.2021.01.010

Journal of ZheJiang University (Engineering Science)

2021, Vol. 55

Issue (1): 81-88 DOI: 10.3785/j.issn.1008-973X.2021.01.010

Surface warpage detection method based on point cloud feature comparison

Yang-bo CHEN(

),Guo-dong YI*(

),Shu-you ZHANG

State Key Laboratory of Fluid Power and Electromechanical Systems, Zhejiang University, Hangzhou 310027, China

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Abstract

A description method of free-form surface warpage was defined aiming at the problems of insufficient description and low detection efficiency of surface warpage, and a detection method of surface warpage based on point cloud feature comparison was proposed. A series of algorithms were analyzed. The surface single-layer point cloud was extracted, and the warpage deformation area was obtained by comparing the spatial position of the measured point cloud and the template point cloud of the surface. Then the warpage distance and the warpage angle were calculated to describe the deformation degree and variation trend of the surface warpage. The results of the example analysis show that the proposed method directly analyzes the surface warpage through the comparison of point cloud features without performing surface reconstruction, which ensures the great accuracy and is more efficient than the three-dimensional reconstruction method in detecting the warpage.

Key words： surface injection molded part warpage point cloud defect detection

Received: 30 July 2020 Published: 05 January 2021

CLC:

TP 391

Corresponding Authors: Guo-dong YI E-mail: 21925190@zju.edu.cn;ygd@zju.edu.cn

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Cite this article:

Yang-bo CHEN,Guo-dong YI,Shu-you ZHANG. Surface warpage detection method based on point cloud feature comparison. Journal of ZheJiang University (Engineering Science), 2021, 55(1): 81-88.

URL:

http://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2021.01.010 OR http://www.zjujournals.com/eng/Y2021/V55/I1/81

基于点云特征对比的曲面翘曲变形检测方法

针对目前曲面翘曲变形描述不充分、检测效率低的问题，定义自由曲面的翘曲变形描述方式，提出基于点云特征对比的曲面翘曲变形检测方法. 研究一系列算法，开展曲面单层点云提取，通过对比曲面实测点云与模板点云的空间位置获取翘曲变形区域；通过计算获得翘曲距离和翘曲张角，描述翘曲的变形程度和变化趋势. 实例分析结果表明，提出的方法不需要进行曲面重建，直接通过点云特征对比进行曲面翘曲变形分析，在保证精度的同时，在效率上比三维重建方法检测翘曲有了较大的提高.

关键词： 曲面, 注塑件, 翘曲变形, 点云, 缺陷检测

Fig.1 Description of warpage at any point on surface

Fig.2 Point cloud description of surface warpage

Fig.3 Process of warpage detection

Fig.4 Impeller physical image and standard model image

Fig.5 Impeller raw point cloud data

Fig.6 Result of single-layer surface point cloud extraction

Fig.7 Results of hazardous area detection

Fig.8 Results of point cloud segmentation

Fig.9 Result of point cloud cluster matching

Tab.1 Result of surface warpage description

Fig.10 Warping distance of boundary points

Fig.11 Line chart of warpage description

Fig.12 Results of three-dimensional surface reconstruction


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