Tetsu-to-Hagane
Online ISSN : 1883-2954
Print ISSN : 0021-1575
ISSN-L : 0021-1575
Instrumentation, Control and System Engineering
Optical Approach for Suppressing Over-detection in Surface Inspection for High Strength Steel Sheets
Takahiko Oshige Hiroaki OnoTakahiro KoshiharaTomohiro HashimukaiHiroyuki Sugiura
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JOURNAL OPEN ACCESS FULL-TEXT HTML

2022 Volume 108 Issue 1 Pages 22-28

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Abstract

In a process of manufacturing thin steel sheets such as for automobiles, it is common to install and use optical surface inspection system using a light source and cameras that receives regular reflection and non-regular reflection with properly settled incident and observation angles. However, surface inspection is getting more difficult for automobile steel sheets which are being promoted to high tensile strength steel sheets for safety. For example, harmless glittering glossy parts existing on the surface of the steel sheet are detected and mistakenly recognized as a harmful defect, which is called over-detection, or a large amount of over-detection interferes with proper inspection. That is the reason why conventional technologies could not be applied to high tensile strength steel sheets with harmless glittering glossy parts.

This paper describes the cause of harmless glittering glossy parts and essential measures to completely prevent the over-detections by optical means.

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© 2022 The Iron and Steel Institute of Japan

This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs license.
https://creativecommons.org/licenses/by-nc-nd/4.0/
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