Title:
【発明の名称】完全な外部突出部を有する管状部材を製造する方法
Document Type and Number:
Japanese Patent JP3160647
Kind Code:
B2
Abstract:
A tubular member having integral exterior protrusions is manufactured by providing a hollow element, for example by extrusion, having therein an axially extending interior defined by a surrounding wall having a thickness varying circumferentially. Such hollow element is positioned within a die that has therein lateral voids. The hollow element within the die is subjected, at the interior thereof, to an axially sequential deformation, for example by sequential penetration through the interior by a mandrel. This results in a non-elastic flow of the material of a thicker portion of the wall in lateral directions thereof into the voids in the die. This results in the hollow element, being formed into a tubular member having on the exterior thereof solid protrusions.
Inventors:
Sorensen, Jens Sandale
Application Number:
JP52008293A
Publication Date:
April 25, 2001
Filing Date:
May 14, 1993
Export Citation:
Assignee:
NORSK HYDRO ASA
International Classes:
B21C37/29; F28F9/02; (IPC1-7): B21C37/29; F28F9/02
Domestic Patent References:
| JP4834664B1 |
Attorney, Agent or Firm:
Soga Doteru (6 people outside)
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