Research on Visual Measurement of Aperture and Hole Group Center Distance Based on Geometric Constraint

被引:2
|
作者
Li, Chunfeng [1 ,2 ]
Xu, Xiping [1 ]
Ren, Zhen [3 ]
Liu, Siyuan [4 ]
机构
[1] Changchun Univ Sci & Technol, Coll Optoelect Engn, Changchun 130012, Peoples R China
[2] Changchun Univ, Sch Elect Informat Engn, Changchun 130022, Peoples R China
[3] Changchun Univ, Coll Mech & Vehicle Engn, Changchun 130022, Peoples R China
[4] Jilin Univ, Sch Mech & Aerosp Engn, Changchun 130025, Peoples R China
来源
SYMMETRY-BASEL | 2023年 / 15卷 / 06期
基金
中国国家自然科学基金;
关键词
mechanical engineering; machine vision; visual measurement; hole diameter; hole center distance;
D O I
10.3390/sym15061255
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Hole is the most common symmetrical geometric structure of mechanical parts, and aperture and hole center distance are important measured dimensions in machining. However, existing visual measurement methods often require high equipment installation accuracy and low measurement accuracy. To solve the problem of projection deformation of the measured hole: Firstly, a local coordinate system is created, and the coordinate plane of the coordinate is parallel to the end face of the measured hole. Secondly, a cone is established, the end face of the measured hole is alike to the bottom face of the cone, and the optical center of the camera is the vertex. The space equation of the cone is represented by the coordinates of the center point of the hole. Finally, a cutting plane is established near the imaging plane of the camera, and the intersection line equation between the plane and the cone is obtained, and the diameter of the measured hole and the coordinates of the center of the circle are obtained through the parameters of the intersection line equation. In order to solve the problem of errors in edge points of the hole, geometric constraints based on the center of the circle are used to improve measurement accuracy. This experiment takes the automobile insert mold as the measured part and uses the measurement model of this paper to measure the aperture and hole center distance of the mold. The measurement results show that the measurement accuracy of the aperture is 0.018 mm, the measurement accuracy of the center distance of the hole is 0.05 mm, and the maximum relative error is 2.2%.
引用
收藏
页数:13
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