Title:
EXTRUSION METHOD AND EXTRUSION MECHANISM
Document Type and Number:
Japanese Patent JP2004148358
Kind Code:
A
Abstract:
To provide an extrusion method and extrusion mechanism for pipe-shaped articles P capable of averting the fracture due to tension even if the length of the pipe-shaped articles to be extruded is set large and a drawing rate Sp/Sw is set small.
An insert punch (22) is made slidable relative to a punch sleeve (21) and the advance of the insert punch (22) is stopped when a small-diameter stem part (22b) of the insert punch (22) arrives at a small-diameter hole part (11b) of a die hole (11). The extrusion of a workpiece pipe (W) by a punch sleeve (21) is performed while the stop state of the insert punch (22) is held.
Inventors:
KAMEDA JUJI
ANAMI KIYOSHI
HATORI YOSHIO
ANAMI KIYOSHI
HATORI YOSHIO
Application Number:
JP2002316272A
Publication Date:
May 27, 2004
Filing Date:
October 30, 2002
Export Citation:
Assignee:
SANOH IND CO LTD
International Classes:
B21C23/08; B21C25/04; B21J5/06; B21K21/04; (IPC1-7): B21J5/06; B21C23/08; B21C25/04; B21K21/04
Attorney, Agent or Firm:
Masanori Nakamura
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