Title:
SHEARING METHOD
Document Type and Number:
WIPO Patent Application WO/2018/043730
Kind Code:
A1
Abstract:
The present invention provides a shearing method whereby residual stress is small, a sheared surface having excellent surface properties is formed, and the service life of a punch is increased in a shearing process for shearing, at a shear line that crosses a weld, a work piece in which a steel sheet and another steel sheet are welded, the level difference width of the weld being large and/or the work piece having a strength of 1000 MPa or greater. The shearing method pertaining to the present invention being a method for shearing a work piece having a weld using a punch and a die, wherein the shearing method is characterized in that two protrusions are provided to an edge of the punch, all or a portion of the weld of the work piece is flanked on both sides by the two protrusions, and the work piece is sheared at a shear line that crosses the weld.
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| WO/1991/001205 | ROTARY ARC RAM |
Inventors:
YASUTOMI TAKASHI (JP)
SAITO MASAHIRO (JP)
YONEMURA SHIGERU (JP)
YOSHIDA TOHRU (JP)
SAITO MASAHIRO (JP)
YONEMURA SHIGERU (JP)
YOSHIDA TOHRU (JP)
Application Number:
PCT/JP2017/031681
Publication Date:
March 08, 2018
Filing Date:
September 01, 2017
Export Citation:
Assignee:
NIPPON STEEL & SUMITOMO METAL CORP (JP)
International Classes:
B23D15/04; B21D28/00; B21D28/34; B23D15/06
Foreign References:
| JP2010036195A | 2010-02-18 | |||
| JP2007283339A | 2007-11-01 | |||
| JPS6277126A | 1987-04-09 | |||
| JPS5818627U | 1983-02-04 | |||
| JP2006224151A | 2006-08-31 | |||
| JP2006224151A | 2006-08-31 | |||
| JP2014111283A | 2014-06-19 | |||
| JP2009183989A | 2009-08-20 | |||
| JPH0460318U | 1992-05-25 |
Other References:
PROCEEDINGS OF THE 63RD JAPANESE JOINT CONFERENCE FOR THE TECHNOLOGY OF PLASTICITY, pages 338
Attorney, Agent or Firm:
AOKI, Atsushi et al. (JP)
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