| 摘要 |
PROBLEM TO BE SOLVED: To provide a groove forming apparatus with which an annular groove having high accuracy of shape is formed on a metallic pipe. SOLUTION: This groove forming apparatus is provided with a supporting roller 10 having an annular concave groove 12a formed along the peripheral direction on the outer peripheral surface, a driving motor 20 for rotating the supporting roller 10 around the axial center, a press roller 30 which is provided with an annular projected line part 31b formed along the peripheral direction on the outer peripheral surface and elevating and lowering mechanisms 25, 35, 38 for vertically elevating and lowering the press roller 30 and constituted so that the annular groove 91 is formed on the outer peripheral surface in the end part by clamping and pressing the metallic pipe 90 with the press roller 30 and the supporting roller 10. The press roller 30 is arranged in a position where is offset on the opposite side to the rotating direction of the supporting roller 10 on the basis of a vertical plane including the axial line of the supporting roller 10. COPYRIGHT: (C)2004,JPO&NCIPI
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