Strong specular reflection workpiece thin and narrow groove detection device and method based on strip-shaped light sources

Abstract

The invention provides a strong specular reflection workpiece thin and narrow groove detection device and method based on strip-shaped light sources, and belongs to the field of welding automation. According to the device and the method, a strip-shaped light source array irradiates the surface of a workpiece so that a workpiece surface image with the uniform gray level can be obtained, and the automatic detection on a strong specular reflection workpiece thin and narrow groove is achieved by determining the relative position and the posture between a welding gun and the workpiece through a laser array. According to the device and the method, the strip-shaped light source array irradiates the surface of the strong specular reflection workpiece so that the uniform-illumination workpiece surface image can be obtained, the characteristics of the groove in the image are obvious, the center position of the groove is conveniently and accurately extracted, and the detection accuracy can reach 0.03 mm; the relative position and the posture between the workpiece and the welding gun can be rapidly and accurately obtained through the laser array; the system structure is simple, the detection accuracy is high, instantaneity is high, cost is low, and the strong specular reflection workpiece thin and narrow groove detection device and method can be applied to automatic detection of the groove of the strong specular reflection workpiece surface and are particularly suitable for the occasion of high-energy beam welding automatic tracking of the thin and narrow groove workpiece with the groove gap smaller than 0.1 mm.

Description

technical field [0001] The invention belongs to the field of welding automation, and in particular relates to a device and method for detecting thin and narrow grooves of workpieces with strong specular reflection based on strip light sources. Background technique [0002] The lightweight development of aerospace components and the improvement of reliability requirements pose a major challenge to weld visual inspection and tracking. First, the groove form of the workpiece to be welded is generally I-type butt groove, the groove gap is extremely small (generally no more than 0.1mm), and a slight deviation in the relative posture of the welding torch and the groove may cause serious welding defects , has extremely high requirements for detection and tracking accuracy; second, most aerospace components are made of aluminum-magnesium alloy, with a reflectivity of more than 95%, and the strong specular reflection on the surface makes the image brightness extremely uneven, and may...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to address the deficiencies of the prior art, and propose a device and method for detecting thin and narrow grooves of strong specular reflection workpieces based on strip light sources. Problems such as uneven gray scale of the image caused by strong specular reflection on the surface of the workpiece, difficulty in accurately determining the relative pose of the welding torch and the workpiece, etc., in order to automatically identify the groove in advance, especially for automatic detection of narrow grooves with a groove gap less than 0.1mm

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