Title:
MANUFACTURE OF INTERMEDIATE DRAWN TUBE
Document Type and Number:
Japanese Patent JP2001047127
Kind Code:
A
Abstract:
To easily manufacture a tube having an intermediate drawn part in which difference in diameter is large between both ends.
One end part of a tubular stock 1 is formed larger in diameter than the other end, and the diameter γ of the tubular stock 1 is set to be between the diameter α of a contracted tubular part 3 formed on one end and the diameter β of an expanded tubular part 6 formed on the other end. One end of the tubular stock 1 is contracted, and the other end is expanded. An intermediate part of the tubular stock 1 is drawn to the diameter S smaller than the diameter α of one end contracted through spinning.
Inventors:
MORIKAWA AKINOBU
IRIE TORU
IRIE TORU
Application Number:
JP2000201713A
Publication Date:
February 20, 2001
Filing Date:
January 26, 1999
Export Citation:
Assignee:
SANGO CO LTD
International Classes:
B21C37/16; B21C37/15; B21D22/16; B21D41/02; B21D41/04; (IPC1-7): B21C37/16; B21C37/15; B21D22/16; B21D41/02; B21D41/04
Attorney, Agent or Firm:
Hasegawa Yoshimichi