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1. (WO2017038962) METHOD FOR MANUFACTURING DOUBLE PIPE

Pub. No.:    WO/2017/038962    International Application No.:    PCT/JP2016/075757
Publication Date: Fri Mar 10 00:59:59 CET 2017 International Filing Date: Sat Sep 03 01:59:59 CEST 2016
IPC: F28D 7/10
B21D 53/06
B60H 1/22
F28F 21/08
F28F 1/16
F28F 1/36
Applicants: VALEO JAPAN CO., LTD.
株式会社ヴァレオジャパン
Inventors: IIJIMA, Kenji
飯島 健次
HAYASHI, Naoto
林 直人
Title: METHOD FOR MANUFACTURING DOUBLE PIPE
Abstract:
To provide a method for manufacturing a double pipe where it is possible to easily insert an inner pipe into an outer pipe, and to easily and reliably secure the outer pipe and the inner pipe irrespective of the extension-direction dimensions of straight parts or curved parts. The steps for manufacturing a double pipe (7) used as an internal heat exchanger in a refrigeration cycle mounted in a vehicle comprise an insertion step for inserting an inner pipe (11) having a smaller outer diameter than the inner diameter of an outer pipe (12) into the outer pipe (12), and a securing step for securing the outer pipe (12) and the inner pipe (11) by indenting a portion of the outer pipe (12) until contact is made with the outer circumference of the inner pipe (11), said securing step being performed after the insertion step. In the securing step, e.g., the outer pipe (12) is indented so as to have a plurality of bottomed holes (22) present therein in various locations.