A method and system for fastener dimension measurement based on structured silhouettes

CN121898263BActive Publication Date: 2026-06-09AVIC XIAN AIRCRAFT IND GRP CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
AVIC XIAN AIRCRAFT IND GRP CO LTD
Filing Date
2026-03-26
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

Traditional manual inspection methods for fasteners are inefficient and inaccurate, making it difficult to meet the high-precision inspection requirements of the aircraft manufacturing industry. Conventional visual inspection is also inaccurate in environments with strong light and noise.

Method used

A fastener dimension measurement method based on structured contour lines is adopted. Through image acquisition, feature point extraction and symmetry line correction, the distance between fastener intersection points is calculated, and the machining accuracy is determined in combination with the baseline.

Benefits of technology

It improves the accuracy and efficiency of fastener dimension measurement, meets the high-precision inspection requirements of aircraft manufacturing, and ensures that fastener quality meets design standards.

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Abstract

The application belongs to the technical field of test and measurement, and particularly relates to a fastener size measurement method and system based on a structured contour line. The method comprises the following steps: placing a calibration block on a detection platform to perform image acquisition, and taking the upper edge line of the calibration block as a reference line; removing the calibration block, and placing a fastener on the detection platform to perform image acquisition; extracting a plurality of feature points from the outer contour of the fastener image, calculating a symmetry line for representing the symmetry axis of the fastener, and correcting the outer contour line of the image based on the symmetry line; determining the cylindrical outer contour straight line and the conical outer contour straight line of the fastener according to the corrected outer contour line, and respectively calculating two intersection points of the cylindrical outer contour straight line and the conical outer contour straight line on the left and right sides of the fastener; determining the distance from the midpoint of the line connecting the two intersection points to the reference line; and determining the fastener machining precision according to the distance and a preset distance threshold. The application improves the measurement precision of the fastener size.
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