How can we try to avoid the harm of roll manufacturers and improve the operation frequency?

The working conditions of rolls in rolling mill parts are messy. Roll manufacturers are considering how to avoid the harm of rolls and improve the operation frequency. Today, let the roll manufacturer Wuxi Taihu roll editor discuss with you how to avoid the harm of rolls and improve the operation frequency.

The working conditions of rolls in rolling mill parts are messy. Residual stress and thermal stress will occur in the preparation process before roll manufacturing and application. When it is used, it is further subjected to the effects of various periodic stresses, including bending, modification, shear, contact stress and thermal stress. The distribution of these stresses along the roll body is uneven and constantly changing. The reason is not only the planning elements, but also the continuous changes of roll wear, temperature and roll shape. In addition, rolling conditions often show anomalies. If the roll is not cooled properly after use, it will also be damaged by thermal stress. Therefore, in addition to wear, the roll often presents various partial hazards and surface hazards such as crack, crack, drop, indentation and so on. A good roll should have a better match between its strength, wear resistance and other performance indexes. In this way, it is not only durable under normal rolling conditions, but also less harmful in some abnormal rolling conditions. Therefore, when making rolls, we should strictly control the metallurgical quality of rolls or supplement external measures to enhance the bearing capacity of rolls. Reasonable roll shape, pass, deformation principle and rolling conditions can also reduce roll operation load, avoid partial peak stress and extend roll life. The reason is related to the residual stress of the roll itself, the mechanical stress during rolling and the thermal stress of the roll, especially when the temperature difference between the surface of the roll body and the core is large. This temperature difference can be caused by poor roll cooling, intermittent cooling or overheating of the roll surface at the beginning of a new rolling cycle. The immeasurable temperature difference between the surface and the core of the roll leads to large thermal stress. When the large thermal stress, mechanical stress and the remaining stress of the roll exceed the core strength of the roll, the roll will be broken.

Cold welding repair method: the cold welding roller uses the principle of high-frequency discharge of electric spark to carry out non thermal surfacing on the metal surface, so there is no deformation, annealing, undercut and residual stress in the process of repairing the defects such as sand holes and scratches of the roller, and the metal arrangement is not changed. With high correction accuracy and coating thickness ranging from a few microns to a few millimeters, it can accumulate, seal and repair defects such as wear, scratch, pinhole, crack, defect deformation, hardness reduction, trachoma and harm of metal workpieces. It only needs grinding and polishing, and can also carry out various mechanical processing such as turning, milling, planing and grinding, as well as post-processing such as electroplating.

OK, the above is a brief introduction for the roll manufacturer to avoid the harm of the roll and improve the operation frequency. If you want to know more about roll products and roll manufacturers, please pay attention to Wuxi Taihu roll Xiaobian.