| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for manufacturing an inside grooved tube capable of improving productivity of the inside grooved tube with high thermal performance, without causing a damage on the grooved plug and capable of making the best possible use of the resources. SOLUTION: A floating plug 2 and a grooved plug 4 connected through a coupling rod 3 to the floating plug 2 are inserted into a metal tube 1, and the metal tube 1 is drawn out through holding dies 9, 7, 8 and in the method for manufacturing the inside grooved tube which forms a plurality of grooves inside the metal tube by pressing the metal tube 1 to the grooved plug 4 through the pressing means 5, 6 during the drawing process, strength of the grooved plug 4 is improved by using a cemented carbide as a material of the grooved plug 4 and the damage on the grooved plug 4 can be restrained.
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