| 摘要 |
PURPOSE:To produce steel bars of high dimensional accuracy by introducing at least one unit of rolling mills of small diameter rolls into finishing mill groups and rolling the steel bars between said rolling mills and the rolling mills in the fore stage thereof or between the rolling mills of the fore stage and the rear stage without tension. CONSTITUTION:At least one unit of rolling mills provided with work rolls of <=10 specific roll diameter are provided in finishing mill groups of a continuous rolling mill group line for production of steel bars by rolling, and the steel bars are rolled without tension between said rolling mills and the rolling mills in the fore stage thereof or between the rolling mills in the fore stage and rear stage. Since the rolling mills of small diameter rolls can decrease the change in the width size of outlet side materials despite the variation in the height sizes of inlet side materials, the fluctuations in the height size are reduced by tensionless control between the front and rear stages to absorb the variance in the width size by said rolling mills of small diameter rolls, whereby the precision rolling of the steel bars is made possible. |
