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Title:
PIPE WITH SPIRALLY GROOVED INNER SURFACE, AND METHOD FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2019/013202
Kind Code:
A1
Abstract:
Provided is a method for manufacturing a pipe (1) with a spirally grooved inner surface, the method enabling an increase in the helix angle of grooves through a simple process. When a pipe (1) with a spirally grooved inner surface is manufactured, first, a pipe blank (2) which is provided with a number of fins (21) protruding from an inner surface and extending in a direction parallel with a pipe axis (20), and with grooves (22) formed between the fins (21) is prepared. Then, the pipe blank (2) is subjected to a bending process for bending in a direction perpendicular to the pipe axis (20), while providing the pipe blank (2) with a torsional moment centered about the pipe axis (20), thereby plastically deforming the fins (21) and the grooves (22) in a helical shape revolving around the pipe axis (20). In this way, it is possible to obtain a pipe (1) with spirally grooved inner surface, the pipe (1) having the helical-shaped fins (11) and grooves (12) revolving around the pipe axis (10).

Inventors:
SAWA Kiyotake (1-7-2 Otemachi, Chiyoda-k, Tokyo 04, 〒1000004, JP)
NAGAO Seiichi (6-5 Nihonbashikabutocho, Chuo-k, Tokyo 26, 〒1030026, JP)
Application Number:
JP2018/026021
Publication Date:
January 17, 2019
Filing Date:
July 10, 2018
Export Citation:
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Assignee:
UACJ CORPORATION (1-7-2, Otemachi Chiyoda-k, Tokyo 04, 〒1000004, JP)
UACJ EXTRUSION CORPORATION (6-5 Nihonbashikabutocho, Chuo-ku Tokyo, 26, 〒1030026, JP)
International Classes:
B21D53/06; B21D7/08; B21D11/14; F25B39/00; F28D1/04; F28F1/40; F28F21/08
Foreign References:
JPS58167030A1983-10-03
JPS59209430A1984-11-28
JP2014140896A2014-08-07
JP2014142174A2014-08-07
Attorney, Agent or Firm:
AICHI, TAKAHASHI, IWAKURA & ASSOCIATES (Meieki Nagata Building, 26-19 Meieki 3-chome, Nakamura-ku, Nagoya-sh, Aichi 02, 〒4500002, JP)
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