Title:
内面螺旋溝付管の製造方法
Document Type and Number:
Japanese Patent JP6966884
Kind Code:
B2
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).
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Inventors:
Sawa Ken
Seiichi Nagao
Seiichi Nagao
Application Number:
JP2017138183A
Publication Date:
November 17, 2021
Filing Date:
July 14, 2017
Export Citation:
Assignee:
Uacj Co., Ltd.
Uacj Extrusion Co., Ltd.
Uacj Extrusion Co., Ltd.
International Classes:
B21D53/06; B21D7/08; B21D11/14; F25B39/00; F28D1/04; F28F1/40; F28F21/08
Domestic Patent References:
| JP58167030A | ||||
| JP59209430A |
Attorney, Agent or Firm:
Patent Business Corporation Aichi International Patent Office