| 摘要 |
PURPOSE:To enable cutting of the inner surface bead of a welded pipe with a different thickness without replacing a jig, by a method wherein the side rollers and the reaction roller of a mandrel, to which a cutting bite is disposed, are caused to match or follow the inner side of the pipe by means of a spreading means and a following means. CONSTITUTION:A cutting bite 4, a side roller 5, and a reaction roller 6 are disposed to a mandrel 2. A spread means 20 is mounted to the side roller 5, and a following means 30 to the reaction roller 6. The means 20 spreads the side rollers 5 and 5 laterally equally by means of a toggle mechanism. The means 30 presses the reaction roller 6 against the inner wall of a pipe 1 by means of a hydraulic cylinder. The rollers 5 and 6 are caused to match or follow the inner size of a pipe by the use of the means 20 and 30, and bead is cut by means of the bite 4. |
