The rolling mill is the equipment to realize the metal rolling process, which generally refers to the equipment to complete the whole process of rolling production, including the main equipment, auxiliary equipment, lifting and transportation equipment and auxiliary equipment. According to rolling variety, rolling mill type and nominal size to name. The principle of "nominal size" for the profile mill is named after the pitch circle diameter of gear holder herringbone gear; The blooming mill is named after the nominal diameter of the roll; Strip mill is named after the length of the working roll; Steel mill is named after the maximum pipe diameter produced. When working, the motor transmits power to the two work rollers through the transmission system, and makes the two work rollers rotate in the opposite direction at the same speed. The work roller, the intermediate roller and the support roller are in close contact due to the extrusion deformation resistance of the rolled part. The friction generated by the pressure between the adjacent rollers drives the intermediate roller and the support roller to rotate around their respective axes. The two intermediate rollers are connected with the piston connecting rod of the two transverse hydraulic cylinders respectively through the thrust bearing system, and the working conditions of the two hydraulic cylinders are just opposite, so that the two intermediate rollers reciprocate the left and right spiral movement, so as to achieve the effect of improving the transverse stiffness of the work roller and improve the rolling quality. The rolling mill deforms the metal material through strong pressure to obtain the desired shape of the material. Used to manufacture various profiles, blanks.