| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a double tube terminal machining method and device uniformizing thickness of an inner tube, preventing occurrence of burrs in a connecting rib end part, and reducing produced cutting powder. SOLUTION: First, a connecting rib 13 is cut along an axial direction by using a cutting tool 30 from an end face of a double tube 10 held by chucking an outer tube 11 (rib cutting process). Then, a slit 21 is formed in the outer tube and the connecting rib 13 from the end face of the double tube 10 to a portion corresponding to an exposure length of the inner tube 12 (slit machining process). The cutting tool has a guide hole 31 guiding an inner tube outer circumferential face 12a of the inner tube inserted therein, a cutting edge 32 cutting the connecting rib, and a guide pin 33 provided inside the guide hole and inserted inside the inner tube while guiding an inner tube inner circumferential face 12b.</p> |
