Title:
TUBE AND METHOD FOR MANUFACTURING TUBE
Document Type and Number:
Japanese Patent JP3941714
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a tube for tube heat exchangers preventing the drop of the pressure withstanding strength ( mechanical strength ) in a bent part and a manufacturing method of the same.
SOLUTION: In this manufacturing method of the tube, a projecting part 112c is formed by making part of a band-plate-shaped member plastically flow by squeezing a inserting part 112. Thus, the length L of the inserting part 112 is shortened, but the thickness in the bent part 112a is not thinned because plastically flowing part becomes the projecting part 112c. Then, a problem that the pressure withstanding strength in the bent part 112c drops is solved. The projecting part 112c is formed without coining the inside of the bent part 112a with an acute punch, so an acute dimple is not formed on the inside of the bent part 112a. Then, the concentration of stress to the bent part 112a is prevented, so the generation of crack and rupture by stress concentration is prevented and the drop of the pressure withstanding strength in the bent part 112a is prevented.
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Inventors:
Takumi Yamauchi
Application Number:
JP2003071477A
Publication Date:
July 04, 2007
Filing Date:
March 17, 2003
Export Citation:
Assignee:
株式会社デンソー
International Classes:
B21D53/04; F28D1/053; B21D5/08; (IPC1-7): B21D53/04; B21D5/08; F28D1/053
Domestic Patent References:
| JP2000213884A | ||||
| JP10305341A |
Attorney, Agent or Firm:
Yoji Ito
Takahiro Miura
Fumihiro Mizuno
Takahiro Miura
Fumihiro Mizuno
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