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    • 6. 发明专利
    • METHOD FOR MANUFACTURING BOILING HEAT TRANSFER PIPE
    • JP2003236639A
    • 2003-08-26
    • JP2002040849
    • 2002-02-18
    • KOBE STEEL LTD
    • TAKAHASHI HIROYUKISAEKI CHIKARA
    • F28F1/26B21H3/00F28F1/42
    • PROBLEM TO BE SOLVED: To provide a manufacturing method for a boiling heat transfer pipe for stably and accurately manufacturing the boiling heat transfer pipe having high heat transfer capacity with the small number of tools even in the case that a cooling medium which is less dense is used. SOLUTION: A fin 2 is helically formed by bringing a disk 11 into rotative contact with the outer surface of a copper pipe stock 15. Next, the top part of the fin 2 is pressed in the diameter direction of the pipe by bringing rolling rolls 12, 13 into rotative contact with the top part of the fin 2. In this way, the point part of the fin 2 is deformed into flat and wide. At this time, flattening is performed so that the value of the ratio (he/hs) of the height he of the fin after flattening to the height hs of the fine before flattening is 0.47 to 0.67. Next, the top of the fin 2 is pressed in intermittent positions with a gear disk 14. In this way, the upper part of the fin 2 is parted and trapezoidal recessed parts 5 are formed intermittently along the direction where the fin 2 is extended. A part between the recessed parts 5 is made into a projecting part 4. COPYRIGHT: (C)2003,JPO