Title:
PRESS-FORMING APPARATUS AND METHOD FOR PRODUCING PRESS-FORMED ARTICLE
Document Type and Number:
WIPO Patent Application WO/2023/153285
Kind Code:
A1
Abstract:
This press forming apparatus comprises a punch, a die, and a blank holder. The punch has a top surface, a side surface, and a punch shoulder located between the top surface and the side surface. The punch shoulder has a punch shoulder straight section extending with a radius of curvature of greater than or equal to 500 mm and a punch shoulder curved section extending with a radius of curvature of less than 500 mm. An area of the top surface located adjacent to the punch shoulder curved section convexly extends outward from the top surface.
The top surface has a protrusion protruding in the pressing direction. The protrusion extends along the extending direction in which the punch shoulder straight section extends. The bottom of a die hole in the die has a shape corresponding to the top surface.
The blank holder is disposed opposite the plate pressing surface of the die.
Inventors:
NATORI JUNKI (JP)
TANAKA YASUHARU (JP)
MIYAGI TAKASHI (JP)
ITO YASUHIRO (JP)
TANAKA YASUHARU (JP)
MIYAGI TAKASHI (JP)
ITO YASUHIRO (JP)
Application Number:
PCT/JP2023/003198
Publication Date:
August 17, 2023
Filing Date:
February 01, 2023
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
B21D22/26; B21D22/30
Domestic Patent References:
| WO2017159783A1 | 2017-09-21 |
Foreign References:
| JP6614160B2 | 2019-12-04 | |||
| JPH0741333B2 | 1995-05-10 | |||
| JPS6272726U | 1987-05-09 |
Attorney, Agent or Firm:
MATSUNUMA Yasushi et al. (JP)
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