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Patent Searching and Data


Title:
METHOD OF MANUFACTURING RING-SHAPED MEMBER
Document Type and Number:
WIPO Patent Application WO/2007/043176
Kind Code:
A1
Abstract:
A method of manufacturing a ring-shaped member in which the outer sides of the pair of curved parts (3d) of a longitudinal annular blank are pressingly energized by the molding outer dies (14) of a pressing device (13) in the directions of the opposite side curved parts (3d) to push open each of the curved parts (3d) to a large curved part with a large radius of curvature to mold a half-finished product (17), and the half-finished product (17) is pushed open by a cooperation between the finishing inner die of the pressing device and a complete round type window part functioning as the outer die to manufacture the ring-shaped member. Since a yielding indicated by the ratio of the weight of the ring-shaped member to the weight of a raw material and a yielding indicated by the ratio of the ring-shaped member to the blank are increased, a manufacturing cost for the ring-shaped member can be reduced.

Inventors:
KANEMITSU TOSHIAKI (JP)
KANEMITSU SHUJI (JP)
ODA MISAO (JP)
OHNISHI MASATAKA (JP)
FUJII NAOKI (JP)
ODA KAZUYUKI (JP)
Application Number:
PCT/JP2005/018840
Publication Date:
April 19, 2007
Filing Date:
October 13, 2005
Export Citation:
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Assignee:
KANEMITSU CORP (JP)
KANEMITSU TOSHIAKI (JP)
KANEMITSU SHUJI (JP)
ODA MISAO (JP)
OHNISHI MASATAKA (JP)
FUJII NAOKI (JP)
ODA KAZUYUKI (JP)
International Classes:
B21D53/16; B21D28/06
Foreign References:
JPH0647139B21994-06-22
JPS455144B1
JPS58128231A1983-07-30
JPS62203633A1987-09-08
Attorney, Agent or Firm:
SUZUE, Shoji et al. (2-4 Komatsubara-cho, Kita-ku, Osaka-sh, Osaka 18, JP)
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