Heat exchanger manufacturing method and diameter enlargement tool
AssigneeSanoh Industrial Co., Ltd.
InventorsNaoya Goto, Takuma Endo
Life of this patent
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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.
Claims8
A heat exchanger manufacturing method, comprising:
- 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.
A diameter enlargement tool to enlarge the diameter of a tube-shaped body formed by rolling a metal sheet into a roll shape, the diameter enlargement tool comprising:
- a circular column-shaped main body that is inserted inside the tube-shaped body;
- ribs that are provided at intervals in a circumferential direction around an outer peripheral face of the main body, that project outward from the main body outer peripheral face, that extend from an end portion of the main body at an insertion direction side toward an opposite side to the insertion direction, and that contact an inner peripheral face of the tube-shaped body;
- and
- inclined portions that are formed at insertion direction leading end portions of the ribs, and that have a projection height from the main body outer peripheral face that gradually increases toward the opposite side to the insertion direction, wherein
- an external diameter of the diameter enlargement tool is larger than an internal diameter of the tube-shaped body.
Dependencies are inferred from the claim text.