Method, system and device for automatic detection of near-surface cracks on the surface of an aluminum bar and medium

CN121521989BActive Publication Date: 2026-06-09TONGCHUAN YIXINFENG ALUMINUM CO LTD

Patent Information

Authority / Receiving Office: CN · China
Patent Type: Patents(China)
Current Assignee / Owner: TONGCHUAN YIXINFENG ALUMINUM CO LTD
Filing Date: 2025-12-15
Publication Date: 2026-06-09

AI Technical Summary

Technical Problem

Traditional single-frequency eddy current testing systems struggle to effectively separate interference signals from defect signals on hot rolling production lines, and cannot calibrate the spatial orientation of aluminum bars in real time, resulting in insufficient detection accuracy and an inability to accurately sort qualified and unqualified products.

Method used

By employing a multi-frequency eddy current probe combined with frequency domain analysis and a three-dimensional spatial coordinate system, the attitude of the aluminum rods is dynamically calibrated by establishing a spatial linear equation for the aluminum rod conveying path. A calibration structure is constructed to separate oxide scale interference and near-surface crack signals. Combined with convex hull feature adjustment and judgment logic, automated sorting is achieved.

Benefits of technology

It achieves high-precision automated detection of near-surface cracks on aluminum bars, reduces detection errors, adapts to the complex working conditions of hot rolling production lines, and enables accurate identification of crack defect signals and precise sorting of products.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application provides an eddy current automatic detection method, system, equipment and medium for surface near-surface cracks of an aluminum bar, relates to the technical field of automatic control, and the method comprises the following steps: at the end of an aluminum bar hot rolling production line, a spatial straight line equation of an aluminum bar conveying path is established, the position and angle of a conveying mechanism are adjusted according to the spatial straight line equation, so that the aluminum bar with rolled oxide scales continuously passes through an eddy current detection area along a spatial straight line path at a constant speed; and the aluminum bar passing through the eddy current detection area is scanned based on a multi-frequency eddy current probe, and mixed eddy current signals containing oxide scale interference background and potential crack defects are synchronously collected. The application realizes effective stripping of interference signals, dynamic compensation of detection errors and accurate sorting of qualified and unqualified products.

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