PRESS-FORMING METHOD - NIPPON STEEL & SUMITOMO METAL CORP

Title:

PRESS-FORMING METHOD

Document Type and Number:

WIPO Patent Application WO/2014/109240

Kind Code:

A1

Abstract:

　An inner punch (11), an outer punch (12) and a die (13) are arranged on the same central axis (10). The outer punch (12) is arranged so as to leave a first space (S1), which is bigger than the plate thickness (T) of a cup vertical wall section (A2), from the inner punch (11) in the radial direction perpendicular to the central axis (10). Also, a punch shoulder R section (12A) that opens up as said section gets closer to the die (13) side is formed on the die (13) side of the inner peripheral surface of the outer punch (12). In a state where a second space (S2) is present between the outer peripheral surface of the inner punch (11) and the inner peripheral surface of the cup vertical wall section (A2), a cup bottom section (A15) is sandwiched between the inner punch (11) and the die (13), and drawing is carried out in which, whilst the outer punch (12) is made to come into contact with the cup vertical wall section (A2) from the punch shoulder R section (12A), the cup vertical wall section (A2) is pushed into the outer peripheral surface side of the inner punch (11) and reduced in diameter, thus causing surplus material to flow into a cup shoulder section (A1) and thicken same.

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Inventors:

YAMAGATA MITSUHARU (JP)
YAMAMOTO SHUJI (JP)
WADA YASUHIRO (JP)

Application Number:

PCT/JP2013/084846

Publication Date:

July 17, 2014

Filing Date:

December 26, 2013

Export Citation:

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Assignee:

NIPPON STEEL & SUMITOMO METAL CORP (JP)

International Classes:

B21D22/30; B21D22/28; B21K21/16

Foreign References:

JPH08309469A	1996-11-26
JPH05329559A	1993-12-14
JPH07155855A	1995-06-20
JPH09295088A	1997-11-18
JP2001038423A	2001-02-13

Attorney, Agent or Firm:

KOKUBUN, Takayoshi (JP)
Takayoshi Kokubu (JP)

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