保持工作輥的上輥和下輥相對于軋機中心線對稱且在軸線方向上移動。這種的工作輥移動的設(shè)計，是用來改變工作輥和支撐輥的偏移需要大的移動量。這種大移動量的采用需要大量的改裝費用，并且需要解決很多問題.

The upper and lower rolls of the work roll are symmetrical and move in the direction of the axis of the rolling mill. The movement of this work roll is designed to change the shift of work rolls and support rolls to require large amounts of movement. The use of this large shift of momentum requires a lot of modification costs, and many problems need to be solved.

閉口式機架為一整體鑄件制成。這種機架形式在型鋼車間中小型軋機上應(yīng)用較多。其優(yōu)點是強度和剛度較高，輥跳值較小，產(chǎn)品精度較高。其主要缺點是制造比較困難，裝卸、換輥不方便。軋制壓力較大、對軋件尺寸要求比較嚴格時常采用閉口式機架。Therodisdrivenbythemoldtomakethereverserotationmovementwiththemold。如初軋機、型鋼連軋機和型鋼成品軋機等。

The closed frame is made of a whole castings. This type of frame is used more in the small and medium mill in the steel workshop. Its advantages are that the strength and stiffness are high, the roll jump value is small and the precision of the product is high. Its main disadvantage is that it is difficult to manufacture, and it is inconvenient to load and load and change the roll. When the rolling pressure is larger and the requirements for the size of the rolled piece are strict, the closed frame is often used. Such as the early rolling mill, the type steel continuous rolling mill and the steel finished rolling mill, etc.

使用熱軋的第二個優(yōu)點就在于其可以適當?shù)母纳平饘僖约昂辖鸩牧系募庸すに囆阅堋Ｒ簿褪钦f，其可以把較大的晶粒進行破碎，同時可以減少裂紋的出現(xiàn)，這樣一來，也就相當于減少了鑄造過程中的缺陷問題，提高合金的加工性能。

The second advantage of hot rolling is that it can appropriately improve the processing performance of metal and alloy materials. That is to say, it can break the larger grain and reduce the appearance of the crack, which is equivalent to reducing the defects in the casting process and improving the processing performance of the alloy.