| 摘要 |
<p>PURPOSE:To obtain a wire and bar having high dimensional accuracy by controlling respectively the draft positions of the final stand and the entire remaining stand according to the deviation of the size of a material to be rolled in the rolling down direction of the final stand and the size in the direction orthogonal with the rolling down direction from the target values. CONSTITUTION:The size (y) of the material 10 to be rolled in the rolling direction and the size (x) in the direction orthogonal with the rolling down direction on the outlet side of the final stand are measured in the stage of rolling the wire or bar with a block finishing mill group disposed with a pair of rolls so as to cross each other with each of the stands. The draft position of the final stand is controlled according to the deviation DELTAy of the size (y) from the target value and further the draft position of the entire remaining stand is controlled according to the deviation DELTAx of the size (x) from the target value. The draft ratio in each group of the odd number stands and even number stands is made constant so that the tension state between the stands does not change. The production of the wire and rod having the high dimensional accuracy is thus made possible.</p> |
