| 摘要 |
<p>PURPOSE:To improve product quality by obtaining a necessary tension controlling value based on a thickness of a rolled material, while subtracting an equivalent tension value related to plate thickness change from the tension controlling value to obtain a tension modifying value, and adjusting reel motor currents based on the gained tension modifying value. CONSTITUTION:Thickness meters 6a and 6b are set on the inlet and outlet sides of a reversible 4 stages rolling mill 1, respectively. A feed forward controller 7 and a feed back controller 8 are also set on the mill 1. An output saturation device 11 provides high and low saturation limits for plate thickness control and armature currents of the reel motor are controlled by corresponding high and low limit values when the tension modifying value exceeds the saturation limit. A necessary tension controlling value is obtained by thickness measurements by thickness meters 6a and 6b, while a tension value equivalent to a reduction modifying value is subtracted from the tension controlling value to obtain a tension modifying value. The current of reel motors M2 and M3 is adjusted based on that tension modifying value. In this way, the accuracy of tension control is increased and the product quality is improved.</p> |
