摘要 |
PROBLEM TO BE SOLVED: To provide a manufacturing method for an inner grooved tube which causes less breakage during forming at a high speed and can improve productivity, and an apparatus therefor. SOLUTION: The apparatus comprises a grooved plug 5 having grooves 4 on the outer peripheral face, a pressing means 6 to press a metal tube 1 from outside at the setting position of the grooved plug 5, and a drawing die 8 to reduce the diameter of metal tube 1 with an imprinted groove shape on the inner surface into the designated outer diameter. Furthermore, a cooling device 12 to cool the metal tube 1 is installed between the pressing means 6 and the drawing die 8. COPYRIGHT: (C)2006,JPO&NCIPI
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