Mechanical wear is caused by the friction between the surface of the mill roll and the rolling stock, which requires periodic grinding of the roll surface. In order to meet the process requirements of the shape control, the roll surface busbars must be processed into various special high-order square curves according to different process requirements.

The work rolls of the small 20-high mill have a weight of only about 100 grams, while the weight of the support rolls of the wide-plate mill has exceeded 200 tons. At the same time, the roller surface busbars of the work rolls and the backup rolls are mutually coupled according to certain requirements, so the processing is difficult.

The cold rolls are mounted on the two tips and should not be too loose or too tight. If the mill roll is too loose, the cold roll will have a slight amount of turbulence and runout, which will affect the processing precision and surface roughness of the roll. If it is too tight, the center hole and the tip of the roll will have large friction and heat, which will cause bending deformation of the roll, and the surface roughness and roundness after processing are also poor.

When the grinding machine on the roll is used for maintenance, the grinding wheel dynamic balancing device adopts a simple, practical and reliable manual mechanism and is equipped with a dynamic balance detector. It is easy to install and does not need to make deep and large mounting holes in the center of the spindle, so it will not affect the rigidity of the spindle. It is especially suitable for grinding machines requiring strong grinding.

The tool setting is very important in ultra precision grinding and mirror grinding. If it is given too much for the first time, it will not only damage the micro edge on the surface of the grinding wheel, but also burn the roll and produce a spiral shape due to the limited cutting ability of the grinding wheel, which has a serious impact on ultra precision grinding. Therefore, when grinding the roll, it is necessary to carefully align the cutter.

Several methods can be used to judge whether the grinding wheel has contacted with the roll: one is to use the grinding indicator; the other is to apply a thin layer of red oil on the surface of the roll, and then make the grinding wheel slowly approach the roll for judgment; in addition, the distance between the grinding wheel and the roll can be judged by observing the water ratio on the grinding wheel or the change of the cooling liquid sound between the roll and the grinding wheel, but it is difficult to use this method as an accurate tool setting.