Improvement of Hole Expansion for Punched Ultra High Strength Steel<br>Sheets by Smoothing Fracture Surface

• 安部 洋平

  豊橋技術科学大学工学部

• 池田 豊

  豊橋技術科学大学大学院工学研究科

• 森 謙一郎

  豊橋技術科学大学工学部

Bibliographic Information

Other Title

• 超高張力鋼板の破断面平滑加工による<br>穴広げ性の向上
• チョウコウチョウリョク コウハン ノ ハダンメン ヘイカツ カコウ ニ ヨル アナヒロゲ セイ ノ コウジョウ

Abstract

The formability of hole expansion for punched ultra high strength steel sheets with low ductility was improved by smoothing the sheared edge of the sheet. In the smoothing process, the notch effect of the macroscopic roughness in the fracture face was eliminated using a conical punch. The effects of the smoothing conditions on the limiting expansion ratio were investigated. Setting the angle of the conical punch in the smoothing to the same angle as the fracture face was effective in improving the limiting expansion ratio. The clearance ratio in the punching influenced the limiting expansion ratio, thus the optimum clearance ratio resulted in a maximum limiting expansion ratio after the smoothing. The smoothing of the sheared edge was effective in improving of the formability of hole expansion for ultra high strength steel sheets.

Journal

• Journal of the Japan Society for Technology of Plasticity

  Journal of the Japan Society for Technology of Plasticity 52 (603), 485-489, 2011

  The Japan Society for Technology of Plasticity

Keywords

• sheet metal forming
• punching
• high strength steel sheet
• burring
• hole expansion
• smoothing

Details

• CRID: 1390001206498274432
• NII Article ID: 10028152067
• NII Book ID: AN00135062
• DOI: 10.9773/sosei.52.485
• COI: 1:CAS:528:DC%2BC3MXns1Wgs7Y%3D
• ISSN: 18820166
• ISSN: 00381586
• NDL BIB ID: 11099179
• Web Site: http://id.ndl.go.jp/bib/11099179
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I11099179
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed