| 摘要 |
<p>Provided is an apparatus for adjusting a screw-down position by which an engagement failure of a leading end of a tubular member which is rolled by a three-roll type mandrel mill, or the like can be prevented. An apparatus (100) for adjusting screw-down positions of mill rolls (R1 to R6) which constitute a three-roll type mandrel mill is provided with screw-down devices (1) (P1 to P6) which move the mill rolls (R1 to R6) in the screw-down direction and a controller (2) which controls the screw-down devices (1). Immediately after the commencement of the rolling operation for the leading end of the tubular member (T) by the mill rolls, among the mill rolls (R1 to R6), arranged in at least one rolling stand, the controller (2) controls the corresponding screw-down device (1) to move those mill rolls in a closing direction. Preferably, the controller (2) causes the screw-down device (1) to move the mill rolls arranged in at least one rolling stand, among the mill rolls (R1 to R6) in the closing direction at a speed of 16 mm/sec or higher.</p> |
