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Patent Searching and Data

Document Type and Number:
WIPO Patent Application WO/2018/180711
Kind Code:
In order to be capable of reducing warping in a vertical wall section during pressing, without buckling occurring, the present invention press-molds one vertical wall section in a linear shape and press-molds the other vertical wall section to curve and form a hat cross-section shape not having a flange section. The present invention comprises: a punch and a pad having top plate sandwiched therebetween; a bending blade; and a stopper. The punch is supported by a first cushion component. The bending blade has: an upper mold component and a lower mold component that are arranged facing in the press direction and having an interval (D) therebetween equal to a set compression value in the range of 2%–6% of the height of the vertical wall section; and a second cushion component interposed between the upper mold component and the lower mold component, maintaining the interval (D), and capable of contracting in the press direction. The cushion pressure of the second cushion component is smaller than the cushion pressure of the first cushion component and has sufficient cushion pressure so as to not contract during bend-molding of the vertical wall section. The clearance between the punch side surface and the bending blade is at least 90% of the plate thickness of the material to be machined but less than the plate thickness.

MIYAKE Hiroto (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chome, Chiyoda-k, Tokyo 11, 〒1000011, JP)
SHINMIYA Toyohisa (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chome, Chiyoda-k, Tokyo 11, 〒1000011, JP)
TOYODA Daisuke (1657-1, Nogami, Nasukarasuyama-sh, Tochigi 34, 〒3210634, JP)
TAKEBE Hiroyuki (1657-1, Nogami, Nasukarasuyama-sh, Tochigi 34, 〒3210634, JP)
KONKAWA Youichi (17, Shobuike, Kikuta-machi, Koriyama-sh, Fukushima 51, 〒9630551, JP)
Application Number:
Publication Date:
October 04, 2018
Filing Date:
March 19, 2018
Export Citation:
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JFE STEEL CORPORATION (2-3 Uchisaiwai-cho 2-chome, Chiyoda-ku Tokyo, 11, 〒1000011, JP)
H-ONE CO.,LTD. (11-5, Sakuragi-cho 1-chome Omiya-ku, Saitama-sh, Saitama 54, 〒3300854, JP)
International Classes:
B21D5/01; B21D22/20; B21D22/26; B21D24/00; B21D24/02; B21D37/08
Domestic Patent References:
Foreign References:
Attorney, Agent or Firm:
MORI Tetsuya et al. (NICHIEI Patent and Trademark Attorneys, Shiroyama Trust Tower 32F 3-1, Toranomon 4-chome, Minato-k, Tokyo 32, 〒1056032, JP)
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