Title:
METHOD FOR FORMING METAL MEMBER HAVING EXCELLENT SHAPE FREEZING PROPERTIES
Document Type and Number:
WIPO Patent Application WO/2011/148880
Kind Code:
A1
Abstract:
When forming a cross-sectional hat-shaped member which has, on the cross section perpendicular to the longitudinal direction, vertical wall sections (1b, 1b) on both sides, flange sections (1a, 1a) on both sides which are connected to each of the vertical wall sections (1b), and a top plate section (1c) which is connected to the vertical wall sections (1b, 1b) on both sides, and which has a bent section (2) which is bent in the longitudinal direction with the flange sections (1a, 1a) made on the outside using a punch (5) and a die (4), the forming is performed, with the die shoulder radius of the die (4) for obtaining the final shape of the cross-sectional hat-shaped member as R0, in a die (4) which has die shoulder radius (R1) larger than the die shoulder radius (R0), and then the forming is performed in the die (4) of the die shoulder radius (R0). In this way, by dividing the forming into two stages, the stress balance of tensile-compression can be minimized in the final shape resulting from the action of the stress which is relieved in the compression direction in the flange sections (1a, 1a).
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Inventors:
DAIMARU, Seiichi (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
Application Number:
JP2011/061720
Publication Date:
December 01, 2011
Filing Date:
May 23, 2011
Export Citation:
Assignee:
NIPPON STEEL CORPORATION (6-1 Marunouchi 2-chome, Chiyoda-ku Tokyo, 71, 〒1008071, JP)
新日本製鐵株式会社 (〒71 東京都千代田区丸の内二丁目６番１号 Tokyo, 〒1008071, JP)
新日本製鐵株式会社 (〒71 東京都千代田区丸の内二丁目６番１号 Tokyo, 〒1008071, JP)
International Classes:
B21D5/01; B21D1/10; B21D22/26; B21D24/00
Attorney, Agent or Firm:
KOKUBUN, Takayoshi (5th Floor, NBF Ikebukuro City Building 17-8, Higashi-Ikebukuro 1-chome, Toshima-k, Tokyo 13, 〒1700013, JP)
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Claims: