Double tube with petal shape and method of manufacturing the same
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United States of America Patent
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Aug 10, 2021
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N/A
app pub date -
Nov 13, 2019
filing date -
Oct 11, 2019
priority date (Note) -
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Abstract
A double tube includes an inner tube having a corrugated petal shape in a wave form in an outer tube. The double tube is manufactured by a method including: inserting the inner tube into the outer tube and coaxially disposing the inner tube and the outer tube; inserting a plurality of petal forming bars into a space between the outer tube and the inner tube and arranging the petal forming bars along a circumferential direction at predetermined intervals; disposing an assembly of the outer tube, the inner tube, and the petal forming bars in a mold of a hydroforming machine; supplying a fluid in the inner tube while applying a pressure to the inner tube in an axial direction to expand the inner tube; and separating the petal forming bars from the space between the outer tube and the inner tube.
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