| 摘要 |
PURPOSE:To finish a steel pipe to a non-defective pipe having no uneven thickness by detecting a displacement against a pass line of a rolling plug supporting bar, changing a rotating speed of one of inclined rolls, and correcting the displacement, in case of rolling of a seamless steel pipe by the inclined rolls. CONSTITUTION:In case of rolling of a jointless steel pipe by inclined rolls 1, 2 and a rolling plug 7, a displacement S against a pass line of the plug 7 is detected by a displacement S' in a designated position of a supporting bar 6. A rotating speed of one of the inclined rolls 1, 2 is controlled automatically so that this displacement S' becomes ''0'', and the displacement becomes ''0''. By this displacement ''0'', the seamless steel pipe is finished to a non-defective pipe having no uneven thickness. |
