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在生产连铸板坏时,为了提高收得率,使板坯的宽度规格比较集中,而通过相应地采用强力立辊轧机(板坯定宽轧机)来改变板坯规格。这种强力立辊轧机的宽度压下量可达150mm,通过可逆轧制,可将板坯宽度尺寸变更达1000mm以上。然而,采用强力立辊轧机所带来的问题是:随着宽度压下量的增加,可逆轧制道次数增加,板坯前后端形成鱼尾状的切头部分大,致使成材率降低。
In the production of continuous cast plates, in order to improve the yield, the width specifications of the slabs are relatively concentrated, and the specifications of the slabs are changed by accordingly using the vertical roller mill (slab constant width rolling mill). The width of this powerful vertical mill can be reduced by up to 150 mm. By reversible rolling, the width of the slab can be changed by more than 1000 mm. However, the problems caused by using the power roller are as follows: as the width reduction increases, the number of reversible rolling passes increases, and the tail parts forming the fish tail at the front and back ends of the slab are large, resulting in a decrease in the yield rate.