| 摘要 |
<p>PURPOSE:To agree a predicted value with a target value though a varying factor of rolling time is generated by predicting a rolling work done when a tube stock has been rolled and controlling a target electric power of rolling so that a predicted work done of rolling agrees with a target work done of rolling. CONSTITUTION:The target work done of rolling is set in accordance with the deviation between the actual length of the tube stock P on the inlet side of the reeling mill and the length of the predicted target tube stock. While the tube stock P is rolled, the works done of past rolling and the past rolled lengths are sampled and the work done of rolling when the tube stock has been rolled is predicted in accordance with the sampled result. An electric power for rolling is corrected so that the work done of the predicted rolling agrees with the work done of the target rolling. Consequently, though the reeling time of the rolling mill is varied by the lubricating state of the inner surface and rolling temperature, etc., of the tube stock P, the actual length of the tube stock P after reeling is completed can be agreed with the length of the target tube stock without being influenced by this variation.</p> |
