Title:
金属製閉断面部材の製造方法
Document Type and Number:
Japanese Patent JP4640481
Kind Code:
B2
Abstract:
The present invention provides a method capable of accurately producing a metal closed-section member in a relatively simple manner. The method of producing a metal closed-section member formed in a cross-sectionally closed shape, from a metal plate workpiece, comprises a first press-forming step of using a first forming die assembly to press-form the plate workpiece into a convex shape, and a second press-forming step of providing a second forming die assembly, and, after the first press-forming step, under a condition that the press-formed plate workpiece is positioned between a receiving die and a core die of the second forming die assembly, causing relative movement of the core die with respect to the receiving die to press-form the press-formed plate workpiece into a given shape so that two sidewalls of a convex-shaped portion of the press-formed plate workpiece formed on respective ones of both sides of a top wall of the convex-shaped portion of the press-formed plate workpiece during the first press-forming step are displaced toward an inward side of the press-formed plate workpiece and cross-sectionally closed together.
Inventors:
Naoko Saito
Yasutoshi Ishida
Hama Former Tetsuo
Yasutoshi Ishida
Hama Former Tetsuo
Application Number:
JP2008253630A
Publication Date:
March 02, 2011
Filing Date:
September 30, 2008
Export Citation:
Assignee:
Mazda Corporation Inc
International Classes:
B21D22/26; B21D5/01; B21D47/01; B62D25/20
Domestic Patent References:
| JP63278614A | ||||
| JP8090095A | ||||
| JP10058040A | ||||
| JP9276934A | ||||
| JP49023251Y1 | ||||
| JP9308923A | ||||
| JP51014165A | ||||
| JP2003311329A | ||||
| JP1100614U |
Attorney, Agent or Firm:
Takuji Yamada
Mitsuo Tanaka
Masahiro Ishino
Mikio Takeuchi
Haruo Nakano
Kawabata Junichi
Mitsuo Tanaka
Masahiro Ishino
Mikio Takeuchi
Haruo Nakano
Kawabata Junichi