| 摘要 |
<p>PURPOSE:To restrain the fluctuation of mass flow during changing set and also to enable the highly accurate tracking of the thickness changing point in flying thickness changing control of a hot rolled stock. CONSTITUTION:The thickness changing point C is tracked with a tracking device 4 and first the start of roll speed change is snatructed before the thickness hanging point reaches a stand Fi. Then by providing timelag between the instruction for changing a screw-down position and roll speed by a timing setting device 5 so that the start of the screw-down position change is instructed, the fluctuation of mass flow based on the difference in delayed response between a screw-down position controller 1 and a roll speed controller 2 is restrained. And, the travel distance is determined by fetching the looper angle of a looper device 20 into a tracking device 11, calculating the loop length of material between stands and, on the other hand, sampling the speed of sheet and, when the loop length of material is equal to the travel distance, it is discriminated that the thickness changing point reaches the downstream stand.</p> |
