METHOD OF CORRECTING METAL TUBE AND CORRECTING PRESS METAL DIE

WIPO Patent Application WO/2007/049526

A1

The forming recesses (1, 3) of a lower die (2) and an upper die (4) are formed to have a semi-oval profile so as to provide a forming space S almost oval in section with the dies closed. The parting line L between the lower die (2) and the upper die (4) is deviated as much as h from the major axis b of the forming space S toward the upper die (4) side, and the opening width of the forming recess (1) of the lower die (2) is set to be slightly larger than the opening width of the forming recess (3) of the upper die (4). A metal bent tube is plastic-deformed into an almost oval shape in section by closing the dies while being compressed in a peripheral direction by the lower and upper dies (2, 4) to eliminate spring-back caused by bending, whereby the buckling and pinching toward the outer side of the tube wall is prevented by the expanded portion (2a) of the lower die (2) and buckling toward the inner side of the tube wall is prevented by a step difference formed by the difference in opening width between the lower die (2) and the upper die (4).

UMEDA, Takeshi (1 Toyota-cho, Toyota-sh, Aichi 71, 4718571, JP)
梅田 武志 (〒71 愛知県豊田市トヨタ町１番地 トヨタ自動車株式会社内 Aichi, 4718571, JP)

JP2006/320990

May 03, 2007

October 16, 2006

Click for automatic bibliography generation  

TOYOTA JIDOSHA KABUSHIKI KAISHA (1 Toyota-cho, Toyota-shi Aichi, 71, 4718571, JP)
トヨタ自動車株式会社 (〒71 愛知県豊田市トヨタ町１番地 Aichi, 4718571, JP)
UMEDA, Takeshi (1 Toyota-cho, Toyota-sh, Aichi 71, 4718571, JP)

B21D3/10

HANABUSA, Tsuneo et al. (Shin-ochanomizu Urban Trinity 2 Kandasurugadai 3-chom, Chiyoda-ku Tokyo 62, 1010062, JP)

View/Download PDF      PDF Help

Previous Patent: VARIABLE DISPLACEMENT COMPRESSOR

Next Patent: POLYESTER RESIN COMPOSITION AND MOLDED BODY USING SAME