| 摘要 |
PURPOSE:To prevent the generation of runout, while securing the outside diameter accuracy of a follow bloom by moving a position of a disk shoe based on a gorge part as a reference in the tube axis direction in accordance with an inequality and executing the rolling at the time of inclined rolling of a seamless tube. CONSTITUTION:With respect to a position KZ in the tube axis direction of a disk shoe based on a gorged part as a reference, when length of a plug rolling part, and the plug advance quantity are denoted as W and L, respectively, rolling is executed by moving a disk shoe 12 in the tube axis direction by an inequality I, and an inequality II in initial - middle stages of rolling and in the latter stage of rolling, respectively. In such a way, while securing the accuracy of the hollow bloom outside diameter DH, a third sticker (runout failure) can be prevented. |
