据说在14世纪欧洲就有轧机，但有记载的是1480年意大利人达·芬奇（Leonardo da Vinci）设计出轧机的草图。1553年法国人布律列尔(Brulier)轧制出金和银板材，用以制造钱币。此后在西班牙、比利时和英国相继出现轧机。

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 he been rolled out in Spain， Belgium and Britain.

轧机前后有对中导卫的升降辊道，可保证轧件正确进入轧机。三架轧机的辊系和轴承座同步更换，更换平台在轧线外侧，换辊时间长只用20min。传动侧的牌坊，通过液压方式，400rolling mill，由张力螺杆锁定，750rolling mill，操作侧的牌坊为“可拉出”式，朝阳rolling mill，轧件导卫固定在水平轧机的轴承座上。

A lift roller of the guide in the time before and after the mill， rolling mill can ensure the correct entering. The roll system of three rolling mills is replaced synchronously with the bearing seat， and the replacement platform is on the outside of the rolling line. The longest time for changing the roll is only 20min. The movable side arch is locked by tension screw， and the operation side arch is 'pull-out' type， and the rolling guide is fixed on the bearing seat of the horizontal rolling mill.

连续加热炉连续加热炉包括推钢式加热炉、步进式炉、转底式炉、分室式炉等连续加热炉，但习惯上常指推钢式炉。连续加热炉多数用于轧制前加热金属料坯，少数用于锻造和热处理。

It is named according to the varieties of rolling， the type of rolling mill and the nominal size. The principle of 'nominal size'

For rolling mills， they are named after the gear ring and the pitch diameter of the herringbone gear.

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