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|1. (WO2017038962) METHOD FOR MANUFACTURING DOUBLE PIPE|
|Applicants:||VALEO JAPAN CO., LTD.
|Title:||METHOD FOR MANUFACTURING DOUBLE PIPE|
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.