Named according to rolling variety, rolling mill type and nominal size. The principle of "nominal size" is named after the pitch circle diameter of herringbone gear on the gear seat of profile rolling mill; The blooming mill is named after the nominal diameter of the roll; The strip mill is named after the length of the work roll body; The steel pipe factory is named after the largest pipe diameter produced. Sometimes named after the inventor of the rolling mill.
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Rolling mills can be divided into two rolls, four rolls, six rolls, eight rolls, twelve rolls and eighteen rolls. According to the arrangement of rollers, they can be divided into L-type, T-type, F-type, Z-type and S-type.
Ordinary rolling mill is mainly composed of rollers, stands, roller distance adjusting devices, roller temperature adjusting devices, transmission devices, lubrication systems, control systems and roller dismounting devices. In addition to the main components and devices of ordinary rolling mills, the precision calender is also equipped with devices to ensure the calendering accuracy.