Title:
METHOD OF MANUFACTURING SHEET METAL PRODUCT HAVING GROOVE IN INNER CIRCUMFERENTIAL END SURFACE THEREOF
Document Type and Number:
WIPO Patent Application WO/1999/047291
Kind Code:
A1
Abstract:
A method of manufacturing a sheet metal product having a groove in an inner circumferential end surface thereof, capable of forming a groove in an inner circumferential end surface of a sheet metal work without using a cutting process; rendering it unnecessary to remove chips filled in such a groove; eliminating the possibility that the chips deteriorate the working environment; and improving the smoothness of a bottom and side surfaces of such a groove. The gist of this method resides in that a groove is formed in an inner circumferential end surface of an opening-carrying sheet metal product by moving an inner grooving mold, which is provided in the opening, in the diametrically outward direction of the work and thereby pressing a groove molding surface of the inner mold against the inner circumferential end surface, i.e. the circumferential surface of the opening as the work is turned in a predetermined position around the axis of the opening. According to this method, a groove can be provided in an inner circumferential end surface of a sheet metal product without using a cutting process.
Inventors:
KANEMITSU TOSHIAKI (JP)
ODA MISAO (JP)
ODA KAZUYUKI (JP)
ODA MISAO (JP)
ODA KAZUYUKI (JP)
Application Number:
PCT/JP1998/001173
Publication Date:
September 23, 1999
Filing Date:
March 18, 1998
Export Citation:
Assignee:
KANEMITSU KK (JP)
KANEMITSU TOSHIAKI (JP)
ODA MISAO (JP)
ODA KAZUYUKI (JP)
KANEMITSU TOSHIAKI (JP)
ODA MISAO (JP)
ODA KAZUYUKI (JP)
International Classes:
B21H1/04; B21K1/32; (IPC1-7): B21K1/28; B21D53/06
Foreign References:
| JPS57208324A | 1982-12-21 | |||
| JPS6372441A | 1988-04-02 | |||
| JPH0581339B2 |
Attorney, Agent or Firm:
Suzuye, Koichi (Room 607 2-4, Komatsubaracho, Kita-k, Osaka-shi Osaka, JP)
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