System for optical detection on micro-aperture workpiece inner wall

Abstract

The invention discloses a system for optical detection on a micro-aperture workpiece inner wall. Through the system, reflection images of the whole inner wall can be obtained by one step, the acquired images can be stored in a computer, and the acquired images can be processed to form a 360-degree developed view of the workpiece inner wall by a digital image-processing technology. The principle of the system comprises that parallel lights emitted by coaxial light sources vertically and downward enter into workpiece apertures and then the lights are reflected by a spherical reflector to illuminate the workpiece inner wall; the reflected lights illuminating the workpiece inner wall are reflected upward by the spherical reflector, then go through illuminating surfaces of the coaxial light sources and enter into a telecentric lens so that reflection images are formed in CCD; a circular ring image of a part of the workpiece inner wall at a certain height is reflected so that a corresponding circular ring image is formed in the CCD; and the reflection images obtained by the CCD is processed by the digital image processing technology to form the 360-degree developed view of the workpiece inner wall. The system solves the problem that the image of the micro-aperture workpiece inner wall can be obtained difficultly, and reduces an equipment detection cost.

Description

technical field

[0001] The invention relates to a visual inspection system for the inner wall of a workpiece with a small aperture, and in particular discloses an optical inspection system for the inner wall of a workpiece with a small aperture, which can acquire a 360-degree image of the inner wall of the tiny workpiece to detect scratches and defects. , defect detection. Background technique

[0002] With the extensive development and application of microstructured parts with small shapes and sizes in the fields of machinery manufacturing and aerospace, higher and higher requirements are placed on the surface quality of microstructured parts. Some precision inner cavity workpieces with small-diameter through holes have an inner diameter of only 2 to 5 mm. If there are defects on the inner wall surface, it will affect the performance, stability and safety of the workpiece. It has always been a difficult problem to obtain images of the inner wall of tiny apertures. The tra...

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