Title:
INTERNALLY GROOVED PIPE, MANUFACTURING METHOD THEREFOR, AND MANUFACTURING DEVICE THEREFOR
Document Type and Number:
WIPO Patent Application WO/2012/096295
Kind Code:
A1
Abstract:
Provided is an internally grooved pipe having excellent hairpin curve performance for a heat-conducting pipe when a hairpin bending process is performed to incorporate the pipe as a heat-conducting pipe in a heat exchanger.
As an element pipe (1a) is drawn out in the axial direction (X) of the pipe from the upstream side to the downstream side, in conjunction with a fin-forming step wherein multiple fins are formed on the inner surface (1i) of the pipe by pressing the element pipe with a pressure rolling element (23), the diameter of the element pipe (1a) is reduced in a downstream-side diameter reduction step, wherein the diameter of the element pipe (1a) is reduced by means of a downstream-side diameter-reducing die (31A) provided downstream from the pressure rolling element (23) in the drawing direction, as the element pipe is rotated in the pipe circumferential direction in conjunction with rotation of the pressure rolling element (23) in the pipe circumferential direction.
Inventors:
TSURI KOTARO (JP)
Application Number:
PCT/JP2012/050352
Publication Date:
July 19, 2012
Filing Date:
January 11, 2012
Export Citation:
Assignee:
FURUKAWA ELECTRIC CO LTD (JP)
TSURI KOTARO (JP)
TSURI KOTARO (JP)
International Classes:
B21C1/22; F28F1/42
Foreign References:
| JP2590568B2 | 1997-03-12 | |||
| JP2002292420A | 2002-10-08 |
Attorney, Agent or Firm:
NAGATA Yoshiaki et al. (JP)
Yoshiaki Nagata (JP)
Yoshiaki Nagata (JP)
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Claims: