| 摘要 |
<p>PURPOSE:To reduce an off-gauge length caused by sheet thickness fluctuation by changing a rolling schedule due to the change of a kind of steel while keeping interstand tensions of respective stands constant in performing a continuous rolling by a tandem mill while welding together steel sheets of different kinds of steel. CONSTITUTION:In rolling continuously a steel strip by a 5-tandem mill consisting of the 1st stand - 5th one while welding a preceding coil to a succeeding coil of different kind of steel at the inlet side of the mill; a constant tension control between respective stands 1st-5th is performed through the whole period till the changing point of rolling schedule due to the change of a kind of steel located at the inlet side of the 1st stand passes through the outlet side of the 5th stand, and; in conformity with the passing of the changing point through respective stands, the target values of the constant tension control of one interstand or more of the mill 1 are changed into taper forms basing on the previously calculated values to change the draft positions of one stand or more into said taper forms and also to change roll speeds into the taper forms, thereby performing the rolling.</p> |
