Rolled Steel Sheet Magnetic Structure Evaluation Without Destructive Sampling
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Solution Overview
Problem
Existing methods for evaluating the metal structure of high-strength rolled steel sheets, such as those using electron and optical microscopes, are non-real-time and destructive, making it difficult to assess the metal structure of steel sheets without damaging them.
Innovation Solution
A metal structure evaluator that measures magnetic properties in multiple directions using a probe array and determination unit to calculate cyclic components, allowing for non-destructive evaluation of the metal structure based on magnetic property fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electron microscope or optical microscope methods are used to evaluate metal structure, then measurement precision is improved, but the evaluation becomes destructive and non-real-time
Solution Approach 1:
The patent replaces mechanical/optical microscopy methods with electromagnetic induction-based measurement. The evaluation unit measures magnetic flux changes induced by moving magnets over the steel sheet surface, substituting physical contact and light-based observation with field-based detection that does not damage the material.
Solution Approach 2:
The patent introduces magnetic flux as an intermediary to indirectly evaluate metal structure. Instead of directly observing the metal structure under microscopes, the system uses magnetic flux changes caused by moving magnets as a mediator to infer information about the metal structure, enabling non-destructive evaluation.
2Measurement precision
If electron microscope or optical microscope methods are used to evaluate metal structure, then measurement precision is improved, but productivity is reduced due to non-real-time evaluation
Solution Approach 1:
The patent enables continuous real-time evaluation by moving magnets continuously over the steel sheet surface and continuously measuring magnetic flux changes. The evaluation unit processes measurements in real-time as the magnets move, eliminating the need for discrete sampling and laboratory analysis, thus maintaining both precision and high productivity.
3Measurement precision
If multiple magnetization directions are measured, then measurement precision is improved for metal structure determination, but device complexity and measurement time increase
Solution Approach 1:
The patent uses dynamic movement of magnets to achieve measurements in multiple directions. Instead of using a complex static probe array with multiple fixed magnets oriented in different directions, the system moves a magnet (or magnets) dynamically over the surface in controlled patterns, achieving multi-directional measurement capability through motion rather than through complex static geometry.
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
Enables non-destructive evaluation of rolled steel sheet metal structures, improving manufacturing yield and quality management by providing real-time assessment without damaging the steel sheets.
Implementation Method 1
applying a magnetic field on a surface of a rolled steel sheet in one direction; and measuring a magnetic property of the evaluation target point on the surface of the rolled steel sheet
Implementation Method 2
measuring a magnetic property of an evaluation target point in at least two or more different magnetization directions
Data Source
AI summary
A metal structure evaluator for rolled steel sheets includes: a magnetic property measuring unit configured to measure a magnetic property of an evaluation target point in at least two or more different magnetization directions by performing, in the at least two or more different magnetization directions, processing of: applying a magnetic field on a surface of a rolled steel sheet in one direction; and measuring a magnetic property of the evaluation target point on the surface of the rolled steel sheet; and a determination unit configured to determine a metal structure of the evaluation target point based on the magnetic property measured by the magnetic property measuring unit.