Title:
MANDREL AND EXTRUSION DIE
Document Type and Number:
Japanese Patent JP2009131863
Kind Code:
A
Abstract:
To provide a mandrel which has improved strength of a forming cylinder corresponding to miniaturization of holes in a die for extruding a flat multi-hole tube.
The mandrel (10) is used for forming holes of a tube in the extrusion die for forming the flat multi-hole tube. A plurality of forming cylinders (12) are lined up in a comb teeth-like shape on the tip face of a pedestal (11). The forming cylinder (12) is formed so that the cross section of the root part (14) on the pedestal side is larger than the cross section of a bearing part (13) on the tip side corresponding to the hole shape of the tube.
Inventors:
SAKIHAMA HIDEKAZU
Application Number:
JP2007308234A
Publication Date:
June 18, 2009
Filing Date:
November 29, 2007
Export Citation:
Assignee:
SHOWA DENKO KK
International Classes:
B21C25/02; B21C25/04
Domestic Patent References:
| JP2002045913A | 2002-02-12 | |||
| JPS5075960A | 1975-06-21 | |||
| JP2003220408A | 2003-08-05 |
Attorney, Agent or Firm:
Hisayoshi Shimizu
Ken Takada
Yoshihito Shimizu
Ken Takada
Yoshihito Shimizu