Title:
PRESSED COMPONENT MANUFACTURING METHOD
Document Type and Number:
WIPO Patent Application WO/2020/184711
Kind Code:
A1
Abstract:
The present invention provides press-machining technology for reducing the tensile residual stress at the sheared end face of a metal sheet after press-forming in order to prevent the occurrence of delayed fractures in the sheared end face. A pressed component manufacturing method for manufacturing a pressed component by press-forming a metal sheet having a sheared end face, said method comprising: a first press-forming step for estimating the occurrence of tensile residual stress in a direction along the sheared edge of part of the sheared end face of the metal sheet after release from a die; and, as a step subsequent to the first press-forming step, a tensile residual stress relaxing step (5) for extending, in the sheet thickness direction, a region that at least includes the sheared end face location where the occurrence of said tensile residual stress is estimated.
Inventors:
FUJII KENTO (JP)
SHINMIYA TOYOHISA (JP)
YAMASAKI YUJI (JP)
SHINMIYA TOYOHISA (JP)
YAMASAKI YUJI (JP)
Application Number:
PCT/JP2020/011188
Publication Date:
September 17, 2020
Filing Date:
March 13, 2020
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
B21D22/00; B21D22/20; B21D22/26
Foreign References:
| JPH07112574B2 | 1995-12-06 | |||
| JP2006289480A | 2006-10-26 | |||
| JPH07171625A | 1995-07-11 | |||
| JP2003311339A | 2003-11-05 | |||
| JP2017170484A | 2017-09-28 | |||
| JP2003033828A | 2003-02-04 | |||
| JP2019047362A | 2019-03-22 |
Other References:
KENICHIRO MORI ET AL., JOURNAL OF JAPAN SOCIETY FOR TECHNOLOGY OF PLASTICITY, vol. 52-609, 2011, pages 1114 - 1118
KENICHIRO MORI ET AL., JOURNAL OF JAPAN SOCIETY FOR TECHNOLOGY OF PLASTICITY, vol. 51-588, 2010, pages 55 - 59
"Sendankakou no saizensen", PROCEEDINGS OF THE 326TH SYMPOSIUM ON PLASTICITY, pages 21 - 28
M. MURAKAWAM. SUZUKIT. SHINOMEF. KOMUROA. HARAIA. MATSUMOTON. KOGA: "Precision piercing and blanking of ultrahigh-strength steel sheets", PROCEDIA ENGINEERING, vol. 81, 2014, pages 1114 - 1120, XP029078417, DOI: 10.1016/j.proeng.2014.10.219
See also references of EP 3939712A4
KENICHIRO MORI ET AL., JOURNAL OF JAPAN SOCIETY FOR TECHNOLOGY OF PLASTICITY, vol. 51-588, 2010, pages 55 - 59
"Sendankakou no saizensen", PROCEEDINGS OF THE 326TH SYMPOSIUM ON PLASTICITY, pages 21 - 28
M. MURAKAWAM. SUZUKIT. SHINOMEF. KOMUROA. HARAIA. MATSUMOTON. KOGA: "Precision piercing and blanking of ultrahigh-strength steel sheets", PROCEDIA ENGINEERING, vol. 81, 2014, pages 1114 - 1120, XP029078417, DOI: 10.1016/j.proeng.2014.10.219
See also references of EP 3939712A4
Attorney, Agent or Firm:
TANAKA Hidetetsu et al. (JP)
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