| 摘要 |
PROBLEM TO BE SOLVED: To obtain a method of manufacturing a dimpled tube by which slip between a roller and a belt-like material is suppressed and the state of wear of the roller is easily determined only by the visual observation of the appearance of the manufactured tube. SOLUTION: By forming knurled part 10 having a prescribed width on the whole circumference of the middle part in the axial direction of a projection roller 4A which is used in a dimple forming stage P1 and carving a knurled pattern 11 in the length direction of the surface 3f of the belt-like material 3 with the knurled part 10, the slip between the projection roller 4A and the belt-like material 3 is suppressed with the knurled part 10 and dimples 5 formed on the belt-like material 3 can be stably provided at pitches according to the original setting. Because the worn state of the projection roller 4A can be judged by the state of wear of the knurled pattern 11, the wear of the projection roller 4A can be checked without stopping a manufacturing equipment 1. COPYRIGHT: (C)2008,JPO&INPIT
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