閉口式機(jī)架為一整體鑄件制成。這種機(jī)架形式在型鋼車間中小型軋機(jī)上應(yīng)用較多。其優(yōu)點(diǎn)是強(qiáng)度和剛度較高，輥跳值較小，產(chǎn)品精度較高。其主要缺點(diǎn)是制造比較困難，裝卸、換輥不方便。軋制壓力較大、對(duì)軋件尺寸要求比較嚴(yán)格時(shí)常采用閉口式機(jī)架。四棍軋機(jī)的工作輥直徑較小，傳遞軋制力矩，軋延壓力由直徑較大的支承輥承受。如初軋機(jī)、型鋼連軋機(jī)和型鋼成品軋機(jī)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.

軋機(jī)在軋制過程中由軋制力所引起的內(nèi)力沿機(jī)座各承載零件分布的應(yīng)力曲線，稱作應(yīng)力線。為了提高軋機(jī)剛度，減少機(jī)架及各承載零件的變形，采取各種技術(shù)措施后，將這種應(yīng)力線縮短了的軋機(jī)，稱為短應(yīng)力線軋機(jī)。它是高剛度軋機(jī)中的一種。

The stress curve of the rolling force, which is caused by the internal force of the rolling force, along the bearing parts of the frame, is called the stress line. In order to improve the rigidity of rolling mill and reduce the deformation of rack and bearing parts, after taking various technical measures, the mill which shortens the stress line is called short stress line mill. It is one of the high rigidity rolling mills.

據(jù)說在14世紀(jì)歐洲就有軋機(jī)，但有記載的是1480年意大利人達(dá)·芬奇（Leonardo da Vinci）設(shè)計(jì)出軋機(jī)的草圖。1553年法國人布律列爾(Brulier)軋制出金和銀板材,用以制造錢幣。此后在西班牙、比利時(shí)和英國相繼出現(xiàn)軋機(jī)。

It is said that there are rolling mills in Europe in the fourteenth Century, but it is recorded that in 1480, Leonardo Da Vinci (Italian Italian designer Da Finch) designed the draft for rolling mills. In 1553 the French law Adler cloth (Brulier) rolled gold and silver plate, used in the manufacture of coins. Since then, rolling mills have been rolled out in Spain, Belgium and Britain.

輥式軋機(jī)生產(chǎn)率可以很高，有的可達(dá)到2000-4000 件/小時(shí)甚至更高，易于實(shí)現(xiàn)自動(dòng)化生產(chǎn)?？傊?，輥式軋機(jī)適用于對(duì)產(chǎn)品精度要求不高，且同時(shí)軋制一個(gè)或幾個(gè)零件的情況。軋機(jī)專業(yè)廠家介紹，其實(shí)從實(shí)際生產(chǎn)作業(yè)來看，關(guān)于冷軋機(jī)的安全生產(chǎn)主要包括三個(gè)方面，分別為：定期檢修、日常安全操作以及日常的培訓(xùn)管理等。輥式軋機(jī)是三種類型中運(yùn)用多的一種。圓弧式軋機(jī)適用于大批量的為以后鍛造供坯的生產(chǎn)情況。

The productivity of the roller mill can be very high, some can reach 2000-4000 pieces / hour or even higher, and it is easy to realize automatic production. In conclusion, the roll mill is suitable for the low accuracy of products and rolling one or several parts at the same time. Roll mill is the most widely used in three types. The circular arc mill is suitable for large quantities of production for forging later.