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Title:
【発明の名称】筒状または有底筒状部品の製造方法
Document Type and Number:
Japanese Patent JPH074634
Kind Code:
B2
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.

Inventors:
Rokuro Miyashita
Application Number:
JP762490A
Publication Date:
January 25, 1995
Filing Date:
January 17, 1990
Export Citation:
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Assignee:
Rokuro Miyashita
International Classes:
B21D22/26; B21D31/04; B21D51/16; C23F1/00; (IPC1-7): B21D51/16; B21D22/26; C23F1/00
Domestic Patent References:
JP5285055A
Attorney, Agent or Firm:
Takao Watanuki (1 outside)