HEAT EXCHANGER MANUFACTURING METHOD AND DIAMETER ENLARGEMENT TOOL
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United States of America Patent
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Oct 15, 2014
filing date -
Jan 29, 2014
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Abstract
A heat exchanger manufacturing method, including rolling a metal sheet into a roll shape to form a tube-shaped body, inserting the tube-shaped body through a through hole formed at a metal fin, and loosening the metal sheet that has been rolled into a roll shape to enlarge the diameter of the tube-shaped body and place an outer peripheral face of the tube-shaped body in contact with a hole wall of the through hole, and after enlarging the diameter, joining together a roll-overlap portion of the metal sheet that has been rolled into a roll shape.
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