| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To control the tension in tandem rolling without affecting the plate thickness of a rolling material, particularly even if a stand equipped with an electric reduction means is used. <P>SOLUTION: The tension between the stands of the rolling material is controlled by manipulating the roll gap by providing the reduction speed instruction value from a tension control device to the reduction means equipped with a reduction speed control system. Multiple dispersed levels of the reduction speed instruction values are set. The level closest to the consecutive reduction speed instruction values calculated with the reduction control system is set as the standard level. The one-degree higher level from the standard level is set as the upper limit and the one-degree lower level as the lower limit. When the consecutive reduction speed instruction values are within the upper limit and the lower limit, the standard level is fed in the reduction speed control system as the dispersed reduction speed instruction values in order to control the reduction speed. When the consecutive reduction speed instruction values reach the upper limit or the lower limit, the upper limit or the lower limit is set as the new standard level. The one-degree higher level from the new standard level is set as the upper limit and the one-degree lower level as the lower limit to carry out the control in the same way. <P>COPYRIGHT: (C)2003,JPO</p> |
