Method for measuring surface roughness of metal

Abstract

The invention discloses a method for measuring the surface roughness of metal. The method comprises the following steps: scanning the surface of measured metal by adopting a laser structured light 3D visual system; when the scanning plane of the 3D visual system is not parallel to the surface of the measured metal, the 3D visual system levels the surface of the measured metal and obtains a leveled image; the 3D visual system is used for scanning and imaging the surface of the metal to be detected to obtain the 3D morphology of the surface of the metal to be detected; and measuring the surface roughness of the measured metal by using various image processing algorithms. According to the invention, the laser structured light 3D visual system is adopted to scan and image the metal surface to obtain the 3D morphology of the metal surface, and then the roughness of the metal surface is automatically measured by using an image processing algorithm, so that the real-time performance is high, the measurement reliability is improved, and the full automation of large-scale construction surface roughness detection can be realized.

Description

technical field [0001] The invention relates to a cross technology of mechanical engineering and machine vision, in particular to a method for measuring metal surface roughness by using laser structured light vision. Background technique [0002] In the production process of large-scale equipment such as ships, nuclear industry, heavy machinery, and vehicles, metal materials are a commonly used structural material. Among them, ferrous metals, especially steel, are used in a large amount. During the service of these components, it is inevitable that Problems such as corrosion will occur, which will lead to the reduction of the service life of the components, the reduction of the reliability of use and the reduction of the external aesthetics. Spraying the surface is a common method to solve the corrosion problem of ferrous metal surface. In order to improve the bonding between the sprayed material and the metal surface, the metal surface is often shot and sandblasted to impro...

AI Technical Summary

Problems solved by technology

At present, the main methods used for surface roughness measurement are comparison sample visual method, microscope focusing method, stylus method and replica tape method. The main operations of these measurement methods rely on manual work, and the main evaluation also depends on the experience of the staff. , there are problems such as low measurement efficiency, poor measurement objectivity, and low measurement accuracy

[0004] In addition, shot peening and sand blasting environments are relatively harsh environments, and operators also have various unhealthy and dangerous factors during the inspection process

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