Title:
BLANK MATERIAL PRODUCTION METHOD, PRESS-FORMED ARTICLE PRODUCTION METHOD, SHAPE DETERMINATION METHOD, SHAPE DETERMINATION PROGRAM, BLANK MATERIAL PRODUCTION APPARATUS, AND BLANK MATERIAL
Document Type and Number:
WIPO Patent Application WO/2021/010352
Kind Code:
A1
Abstract:
The present invention addresses the problem of providing a punching method with which it is possible to stably ensure a stretch-flangeability that is equivalent to or better than that achieved when using a punching punch having a flat blade at the bottom surface. The punching method according to the present invention is for punching a metal plate by using a punching shear apparatus equipped with: a punch having an upper blade which has a part horizontal with respect to a cutting line and an inclined part at a portion excluding the horizontal part; and a die having a lower blade. The method is characterized in that the upper blade used for punching is formed in such a shape that the inclined part comes into contact first with the metal plate during punching.
Inventors:
NITTA JUN (JP)
YASUTOMI TAKASHI (JP)
TABATA RYO (JP)
YASUTOMI TAKASHI (JP)
TABATA RYO (JP)
Application Number:
PCT/JP2020/027152
Publication Date:
January 21, 2021
Filing Date:
July 10, 2020
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
B21D28/14; B21D28/00; B21D28/16; B21D28/34; B23D15/08
Domestic Patent References:
| WO2018066663A1 | 2018-04-12 | |||
| WO2019064922A1 | 2019-04-04 |
Foreign References:
| JPH0318918U | 1991-02-25 | |||
| JP2009022986A | 2009-02-05 | |||
| JP2009172609A | 2009-08-06 | |||
| JP5042935B2 | 2012-10-03 | |||
| JP5042936B2 | 2012-10-03 | |||
| JP2010036195A | 2010-02-18 | |||
| JP2009145138A | 2009-07-02 |
Other References:
See also references of EP 3998123A4
Attorney, Agent or Firm:
AOKI, Atsushi et al. (JP)
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