Effect of two-stage press blanking on edge stretchability with third-generation advanced high-strength steels
- Authors
- Won, Chanhee; Lee, Wonju; Lee, Hyoun-young; Kang, Yeon-sik; Yoon, Jonghun
- Issue Date
- Sep-2020
- Publisher
- SPRINGER LONDON LTD
- Keywords
- Press blanking; Third-generation AHSS; Two stage blanking; Edge stretchability; In-plane stretching
- Citation
- INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY, v.110, no.1-2, pp 13 - 27
- Pages
- 15
- Indexed
- SCIE
SCOPUS
- Journal Title
- INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
- Volume
- 110
- Number
- 1-2
- Start Page
- 13
- End Page
- 27
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/904
- DOI
- 10.1007/s00170-020-05854-1
- ISSN
- 0268-3768
1433-3015
- 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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