Strip Piece Surface Inspection via Automated Periodic Defect Detection
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Solution Overview
Problem
Current surface inspection methods for strip pieces require lengths of at least two full roll circumferences, leading to cumbersome handling, delayed defect detection, and wastage of rolled metal strips due to the need for manual inspection and lengthy processing times.
Innovation Solution
Cutting strip pieces to lengths shorter than twice the work roll circumference for automatic inspection using a camera system to detect periodic defects, with manual inspection reserved for non-periodic defects, allowing for faster and more efficient handling and timely roll replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If strip pieces are cut to a length of at least two full roll circumferences to detect periodic roll defects, then periodic defects can be reliably detected, but the space required for the strip inspection unit increases and handling becomes complicated and time-intensive
Solution Approach 1:
The inspection process is segmented into two distinct paths: automatic inspection for periodic defects and manual inspection for non-periodic defects. This segmentation allows the system to handle different defect types differently, optimizing both detection reliability and operational efficiency without requiring lengthy strip pieces for all inspection scenarios
Solution Approach 2:
The manual mechanical inspection process is replaced with an automatic camera-based inspection system for detecting periodic defects. This substitution eliminates the need for lengthy strip pieces during manual handling while maintaining reliable detection capability through automated image analysis
2Reliability
If strip pieces of length at least two full roll circumferences are used, then periodic roll defects can be detected, but the conveyance time increases and inspection results are available only after a delay
Solution Approach 1:
The automatic camera-based inspection performs periodic defect detection preliminarily and immediately on shorter strip pieces before they undergo manual inspection or further processing. This preliminary action provides early warning of roll defects, enabling timely roll replacement and preventing waste of additional metal strip
Solution Approach 2:
The time-consuming manual inspection process is replaced with automated camera-based inspection for periodic defects, significantly reducing inspection time and enabling real-time or near-real-time detection results that can immediately trigger roll replacement decisions
3Productivity
If automatic inspection with camera system is used, then inspection speed increases, but non-periodic defects requiring manual inspection reduce overall efficiency
Solution Approach 1:
The inspection system is segmented to handle periodic and non-periodic defects through different pathways: automatic camera inspection for periodic defects and manual inspection for non-periodic defects. This segmentation allows each inspection method to be optimized for its specific defect type, maintaining both speed and completeness
Solution Approach 2:
The automatic camera inspection performs partial inspection focused specifically on periodic defects, while manual inspection handles the remaining non-periodic defects. This partial automation approach achieves sufficient inspection speed for critical periodic defects while maintaining inspection completeness through complementary manual review
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Facilitates easier handling and inspection, reduces wastage by enabling immediate detection and replacement of defective rolls, and optimizes the inspection process by focusing personnel on non-periodic defects, thus minimizing production delays and costs.
Implementation Method 1
the automatic inspection of the upper and/or lower side of the cut-off strip pieces with the aid of a camera system and an analysis unit with respect to any potential types of periodic defects
Data Source
AI summary
The invention relates to a method for the surface inspection of strip pieces (120). The invention further relates to a device for carrying out the method. The method according to the invention comprises the following steps: cutting off the strip pieces (120) from a metal strip (210), wherein the strip pieces (120) comprise a length less than twice the circumference of a work roll (230) by means of which the metal strip (210) has previously been rolled; automatically checking the upper and/or lower side of the cut-off strip pieces (120) with the aid of a camera system (150) and an analysis unit (300) in regard to any periodic types of faults that may be present and caused by the work roll; ending the surface inspection process if periodically occurring types of faults are detected, or; feeding the cut-off strip pieces (120) to a strip inspection unit (140) for checking by means of inspection personnel for non-periodic types of faults if no periodic types of faults had previously been detected.