Fastener dimensional compliance inspection method, inspection equipment, inspection system and medium

Abstract

The present invention provides a fastener dimension compliance inspection method, inspection equipment, inspection system and medium based on the fastener projection image. The method includes: acquiring the projection image of the fastener to be inspected, and obtaining Identify the ellipse contour line in the top view projection image, and determine the inclination angle of the axis of the fastener to be inspected relative to the horizontal inspection table according to the major axis value and the minor axis value of the ellipse contour line; according to the standard parameter table of the fastener to be inspected , determine the bird’s eye size to be detected in the bird’s-eye projection image and detect the size value; correct the size value of the bird’s eye size to be detected according to the inclination angle, and obtain the bird’s eye measurement size value of the fastener to be inspected; judge the bird’s eye measurement size value and the bird’s eye size to be detected Whether the overlooking reference standard value in the standard parameter table matches, and check the compliance of the size of the fastener to be inspected according to the judgment result. The invention accurately and efficiently measures the dimension of the fastener through correction, and improves the efficiency of the dimension inspection of the fastener.

Description

technical field [0001] The invention relates to the technical field of inspection and measurement processing, in particular to a method, device and medium for inspecting fastener size compliance based on fastener projection images. Background technique [0002] In the production process of modern industry, bolts, studs, screws and other fasteners are indispensable components, and there is a large demand in all walks of life. Moreover, in some special high-end fields, there will be special requirements for fasteners, which has given birth to the high-end fastener market. High-end fasteners are mainly for high-end large and complex equipment products: such as aerospace, aviation, high-speed rail, nuclear power, life and health and other fields. Due to the need to face products in different fields, fastener manufacturers generate tens of thousands of fastener categories; while the demand for high-end fasteners is relatively limited, and the number of individual orders is small...

AI Technical Summary

Problems solved by technology

At present, no matter what kind of fasteners are used, the axis of the product must be horizontal during machine vision inspection, otherwise the size cannot be accurately measured

However, different fasteners have different sizes, so it is very difficult to ensure that the axis is horizontal, and different transparent tooling brackets are required

Lighting is required during the measurement process, and the transparent tooling bracket will also affect the accuracy of the size measurement due to light refraction, and a large number of brackets will reduce the automatic measurement of the size of the fastener no matter it is in the management or during the measurement process efficiency

The low efficiency of fastener size measurement will inevitably lead to the reduction of fastener inspection efficiency, thus affecting the application of fastener optical inspection equipment

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