Fastener dimension compliance detection method, detection equipment, detection system and medium

Abstract

The invention provides a fastener dimension compliance detection method, detection equipment, detection system and medium based on a fastener projection image, and the method comprises the steps: obtaining a projection image of a to-be-detected fastener, recognizing an elliptical contour line from an overlooking projection image contained in the projection image, and according to the long-axis value and the short-axis value of the elliptical contour line, determining the inclination angle of the axis of the fastener to be inspected relative to the horizontal inspection workbench; according to the standard parameter table of the fastener to be detected, determining the overlook dimension to be detected in the overlook projection image, and detecting a dimension value; correcting the dimension value of the overlook dimension to be detected according to the inclination angle to obtain an overlook measurement dimension value of the fastener to be detected; and judging whether the overlook measurement dimension value is matched with an overlook reference standard value of the overlook dimension to be detected in the standard parameter table or not, and detecting the compliance of the dimension of the fastener to be detected according to a judgment result. According to the invention, the dimension of the fastener is accurately and efficiently measured through correction, and the efficiency of dimension inspection of the fastener is improved.

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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