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Effect of two-stage press blanking on edge stretchability with third-generation advanced high-strength steels

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Abstract

Two-stage punching has been recently developed to reduce the sheared edge sensitivity of advanced high-strength steels by dramatically improving the hole expansion ratio via reduction of internal confinement. However, there is still no way to effectively apply this concept for the large-scale press blanking process. In this paper, a novel two-stage press blanking process is proposed to selectively improve the edge stretchability of third-generation advanced high-strength steels for regions with concentrated edge tensioning. Pre-hole design concepts were newly adopted for selective improvement. In the two-stage blanking with pre-holes, inducing the uniform shearing angle is critical for reducing work hardening and ensuring high sheared edge quality. The process is governed by the design and composition of the pre-hole for the first blanking and specifying the lengths of the blanking gap for the second blanking. The proposed two-stage blanking has been experimentally validated by sheared edge tensioning, sheared edge quality, and microhardness tests. A comparison with waterjet cutting showed that it was possible to achieve remarkable edge stretchability that was similar to that obtained for waterjet cutting.

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Abbreviations

AHSS:

Advanced high-strength steels

BIW:

Body-in-white

3G AHSS:

Third-generation AHSS

HER:

Hole expansion ratio

SET:

Sheared edge tensioning

SAZ:

Sheared affected zone

SEM:

Scanning electron microscopy

DIC:

Digital image correlation

2D spherocylinders:

Two-dimensional spherocylinders

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Funding

The author Prof. Jonghun Yoon received research funding from the National Research Foundation of Korea (NRF), grant funded by the Korea Government (MSIT) (No. 2019R1A2C4070160), and “Human Resources Program in Energy Technology” of the Korean Institute of Energy Technology Evaluation and Planning (KETEP), granted by the Ministry of Trade, Industry, and Energy, Republic of Korea (no. 20174010201310).

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Authors and Affiliations

  1. Department of Mechanical Design Engineering, Hanyang University, 222, Wangsimni-ro, Seongdong-gu, Seoul, 04763, Republic of Korea

    Chanhee Won & Wonju Lee

  2. Metal Forming Research Group, POSCO Global R&D Center, 100 Songdogwahak-ro, Yeonsu-gu, Incheon, 21985, Republic of Korea

    Hyoun-young Lee & Yeon-sik Kang

  3. Department of Mechanical Engineering, Hanyang University, 55 Hanyangdaehak-ro, Sangnok-gu, Ansan-si, Gyeonggi-do, 15588, Republic of Korea

    Jonghun Yoon

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  1. Chanhee Won
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  2. Wonju Lee
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  3. Hyoun-young Lee
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  4. Yeon-sik Kang
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  5. Jonghun Yoon
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Correspondence to Jonghun Yoon.

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Won, C., Lee, W., Lee, Hy. et al. Effect of two-stage press blanking on edge stretchability with third-generation advanced high-strength steels. Int J Adv Manuf Technol 110, 13–27 (2020). https://doi.org/10.1007/s00170-020-05854-1

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  • DOI: https://doi.org/10.1007/s00170-020-05854-1

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