Bending performance evaluation method
The method addresses the challenge of evaluating fine cracks on the inner surface of bent metal plates by bending the plate back after the initial bending test, allowing for effective crack assessment without extensive processing, thereby enhancing evaluation efficiency and accuracy.
JP7648021B1Active Publication Date: 2025-03-18JFE STEEL CORP
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Patent Information
- Application Number
- JP2025501268
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- Priority Date
- 2024-03-19
- Filing Date
- 2024-10-24
- Publication Date
- 2025-03-18
- Estimated Expiration
- 2044-10-24
AI Technical Summary
Technical Problem
Existing methods for evaluating the bending performance of metal plates during bending do not effectively assess fine cracks on the inner surface of the bend, which are difficult to detect visually and impact the material's fatigue properties.
Method used
A method involving a bending test followed by a bending reversal step, where the bent metal plate is bent back to facilitate observation of cracks on the inner surface, allowing for the evaluation of crack depth and presence without the need for cutting and polishing.
Benefits of technology
This method enables efficient and simple evaluation of fine cracks on the inner surface of bent metal plates, improving work efficiency and allowing for the estimation of the bending radius range where cracks occur during bending.
✦ Generated by Eureka AI based on patent content.
Abstract
The objective of the present invention is to provide a method capable of efficiently evaluating microcracks that occur on the bent inner surface during bending of a metal sheet. The bending performance evaluation method evaluates the bending performance of a metal sheet (3) to be evaluated against bending deformation by performing a bending test in which the metal sheet (3) to be evaluated is bent using a punch (2) having a bending radius (R) at its tip (2c), and includes a bending back process (11) of bending back the metal sheet (3) bent in the bending test, and an evaluation process (12) of evaluating the surface shape of the bent inner surface (3x) of the metal sheet (3) after the bending back process (11) to determine whether or not cracks occur on the bent inner surface (3x) of the metal sheet (3) to be evaluated due to bending deformation at the bending radius (R).
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