Title:
METHOD FOR MANUFACTURING PROFILED HEAT TRANSFER TUBE FOR HEAT EXCHANGER
Document Type and Number:
Japanese Patent JP3792690
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a manufacturing method of a profiled heat transfer tube for heat exchangers by which a petal-like profiled cross-sectional part is easily formed on the heat transfer tube without generating break in the bottom part of a concave part.
SOLUTION: The heat transfer tube for heat exchangers is manufactured through a stage (stage 1) for cutting a tube stock into a regular size, a stage (stage 2) for forming a petal-like profiled cross-sectional parts, a stage (stage 3) for forming conical parts and a stage (stage 4) for forming a cylindrical part in both ends. In the stage 1, a cylindrical tube stock 10 having the same circumference as the circumference of petal-like profiled cross-sectional part 10c is prepared. In the stage 2, the petal-like profiled cross-sectional parts 10c and imperfect petal-like cross-sectional parts 10b are formed by forming a plurality of recessed parts extended in the longitudinal direction of the tube stock 10 so as to be arranged in the circumferential direction of the tube stock without changing the thickness of the tube stock by pressing a disk-like die in the middle part of the tube stock 10. In stage 3, a conical part 10d is formed in the imperfect petal-like profiled cross-sectional parts 10b. In stage 4, the cylindrical parts 10e are formed by reducing both end parts of the tube stock 10.
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Inventors:
Fukuda Yoshinori
Koichi Yokota
Yanagawa Hiroshi
Koichi Yokota
Yanagawa Hiroshi
Application Number:
JP2003381144A
Publication Date:
July 05, 2006
Filing Date:
November 11, 2003
Export Citation:
Assignee:
Matsumoto Heavy Industries Co., Ltd.
International Classes:
B21D53/06; F28F1/02; B21D15/02; B21D17/04; F28D7/10; F28F1/06; (IPC1-7): B21D53/06; B21D17/04; F28D7/10; F28F1/02
Domestic Patent References:
| JP48034663B1 | ||||
| JP2000190029A |
Attorney, Agent or Firm:
Osamu Kawamiya
Masahiro Ishino
Masahiro Ishino
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