Method for evaluating high-strength steel forming edge cracking by using chambering limit strain

CN120460587AActive Publication Date: 2025-08-12ANGANG STEEL CO LTD
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Patent Information

Application Number
CN202510442068.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-04-09
Publication Date
2025-08-12
Estimated Expiration
2045-04-09

AI Technical Summary

Technical Problem

The prior art cannot accurately predict the problem of cracking of the edges of high-strength steel during stamping forming. The traditional hole reaming test method has large errors or hysteresis, resulting in inaccurate evaluation.

Method used

By optimizing the stop standards of the hole expansion test, iteratively determines the ultimate stroke of the hole expansion without microcracks in high-strength steel, calculates the ultimate strain Δεultra, and compares it with the equivalent strain in actual or CAE analysis to provide an accurate evaluation method.

Benefits of technology

It improves the accuracy and speed of cracking evaluation of the edges of high-strength steel, reduces errors, ensures the stability and pass rate of the stamping process, and is suitable for CAE software simulation.

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Abstract

The invention provides a method for evaluating forming edge cracking of high-strength steel by using chambering limit strain, and belongs to the technical field of stamping forming of high-strength steel for automobiles. Comprising the following steps: by optimizing a stop standard of a reaming test and through repeated iteration, determining a terrace die limit stroke under the condition that microcracks are not generated during reaming of the high-strength steel; according to the average value of the reaming values, corresponding to the terrace die limit strokes of the n samples, of the n high-strength steel which does not generate microcracks during reaming, the reaming limit strain delta epsilon ultra of the high-strength steel is obtained; comparing with the maximum equivalent strain # imgabs0 # generated on the edge of the high-strength steel in the actual stamping forming process; or comparing the maximum equivalent strain # imgabs1 # generated at the edge part in the simulated stamping forming process of the high-strength steel in CAE analysis software to obtain an evaluation result. The method is not influenced by the working environment, is quick and simple to operate, easy to master and high in precision, and can be widely popularized and applied to the stamping production line.
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Citation Information

Patent Citations

  • Metal plate edge cracking prediction considering blanking history

    CN114201897A

  • Test method for determining effective sample to measure hole expansion rate

    CN114544282A

  • Evaluation method and evaluation device for edge tensile cracking limit of thin steel plate

    CN115326504A

  • Reaming performance prediction method considering stress state and forming historical damage

    CN116415461A

  • Method for judging stamping forming edge cracking of high-strength steel based on main strain

    CN116895346A