| 摘要 |
PURPOSE:To improve rolling efficiency and to relax restricting condition to an equipment by executing hot rolling under giving difference between the peripheral speeds having the special condition to the upper and lower work rolls. CONSTITUTION:At the time of rolling the hot-rolled steel plate having 4.0-7.0wt.% Si content at the temp. range of 100-400 deg.C, the rolling giving the difference of peripheral speeds to the upper and lower work rolls is executed. That is, by setting the roll peripheral speed at the low speed side to more than the inlet speed of the material and the roll peripheral speed at the high speed side to less than the outlet speed of the rolled material, the difference between the peripheral speeds is given to the upper and lower work rolls. By this method, as the effect to the rolling load by the friction coefficient at the time of rolling is reduced, the rolling pressure can be reduced to low. Therefore, the rolling reduction ratio per one pass is reduced and the rolling efficiency is improved by reduction of consumption of energy for heat insulating and shortening of rolling time. As the sheet rolling can be executed by work roll having ordinary diameter, the restricting condition to the equipment is relaxed.
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