Title:
METHOD OF MANUFACTURING CYLINDRICAL PART OR ONE HAVING BOTTOM
Document Type and Number:
WIPO Patent Application WO/1993/000184
Kind Code:
A1
Abstract:
A method of manufacturing a cylindrical part which has a number of small holes on its wall or the one having a bottom. The method comprises a punching process of forming a punched pattern having zigzag portions extending in radial directions and connection portions by which the zigzag portions adjoining each other are connected, and a drawing process of extruding the punched metal plate obtained by the punching in such a way that the punched pattern forms a cylinder or a part of a cylinder and that the zigzag portions are expanded. According to this invention, a cylindrical part which has a number of small holes on its wall or the one having a bottom can be so worked easily as to have a predetermined depth through one or two processings, and so the reductions of the manhour and cost can be attained.
More Like This:
Inventors:
MIYASHITA ROKURO (JP)
Application Number:
PCT/JP1991/000875
Publication Date:
January 07, 1993
Filing Date:
June 27, 1991
Export Citation:
Assignee:
MIYASHITA ROKURO (JP)
International Classes:
B21D22/26; B21D31/04; B21D51/16; C23F1/00; (IPC1-7): B21D31/04; B21D35/00
Foreign References:
| JPS62288390A | 1987-12-15 | |||
| JPS5913529A | 1984-01-24 |
Download PDF: