Abstract
Aimed at the rapid non-contact measurement problem of a revolving workpiece's radial and axial dimensions, a fast and high-precision visual inspection method has been presented in this paper. For the workpiece with large axial size, the proposed method established the measurement transformation chain using the object-image and object-object transformations, thus realizing the rapid axial dimensional measurements. For the workpiece with large radial size, this method determined the measurement transformation model based on two-dimensional target and measurement correspondence relationship, and further achieved rapid radial dimensional measurements. The experimental results have shown that the method is effective and can be applied to in situ dimensional measurement of revolving workpieces on high quality production lines.
Highlights
Visual measurement technology is widely used in the field of geometric measurement
Image measurement method is represented by image measuring instrument, which can realize high-precision measurement for some workpieces with small size or thin thickness
For large or thick workpieces such as precision shafts, the measurement task is realized step by step based on the combination of image and guide rail, which shows image measurement method is not suitable for real-time applications [1,2,3]
Summary
Visual measurement technology is widely used in the field of geometric measurement. For the revolving workpieces with small radial or axial size, such as saw blade, ratchet wheel and chip pin, the non-contact measurement methods mainly include image measurement method, laser triangulation method and three-dimensional reconstruction method. Image measurement method is represented by image measuring instrument, which can realize high-precision measurement for some workpieces with small size or thin thickness. For large or thick workpieces such as precision shafts, the measurement task is realized step by step based on the combination of image and guide rail, which shows image measurement method is not suitable for real-time applications [1,2,3]. Laser triangulation method is more mature in surface measurement applications and often integrated in some complex measuring equipment, but it cannot fully meet the requirements of real-time dimensional measurement because of its scanning measurement mode [4,5,6].
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