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How to prevent roll hazards and improve work efficiency?

Article tags:How to prevent roll hazards and improve work efficiency?

The working conditions of rolls in rolling mill components are the most chaotic. Residual stress and thermal stress will occur in the roll preparation process before operation and operation. It is further affected by various periodic stresses, including tortuosity, alteration, 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 wear, temperature and roll shape of the roll are constantly changing in operation. In addition, the rolling conditions are often abnormal. If the roll is not properly cooled after operation, it will also be harmed by thermal stress. Therefore, besides wear, rolls often show various parts of damage such as cracks, cracks, shedding, indentation and external damage. A good roll should have a better match among its strength, wear resistance and other performance indicators. In this way, it is not only durable under normal rolling conditions, but also less harmful when some abnormal rolling conditions occur. Therefore, it is necessary to strictly control the metallurgical quality of rolls or supplement external measures in order to enhance the bearing capacity of rolls. Reasonable roll shape, pass, deformation criteria and rolling conditions can also reduce the work load of rolls, prevent part of peak stress and extend the life of rolls. The reason is related to the residual stress of the roll itself, the mechanical stress and the thermal stress of the roll during rolling, especially when the temperature difference between the outer surface and the core of the roll is large. This temperature difference can be caused by poor roll cooling, discontinuation of cooling or overheating of the roll appearance at the beginning of a new rolling cycle. The infinite temperature difference between the outer surface and the core of the roll results in greater thermal stress. When the greater thermal stress, mechanical stress and residual stress of the roll exceed the strength of the core of the roll, the roll will be broken.

Cold Welding Repair Method: Cold welder rolls are non-thermal surfacing of metal surface using the principle of high frequency discharge of electric spark, so they do not deform, anneal, undercut and residual stress during the process of repairing defects of rolls such as sand holes and scratches, and do not change the metal arrangement. Correction accuracy is high. Coating thickness ranges from several microns to several millimeters. It can stack, seal and repair defects such as wear, scratch, pinhole, crack, defect deformation, hardness reduction, trachoma, damage and so on. It only needs polishing and polishing, and can also be used for turning, milling, planer, grinding and other mechanical processing. And post-processing such as electroplating.

Jiangyin Kaisheng Roll Manufacturing Co., Ltd. is a professional manufacturer of all kinds of cold working rolls, cold rolling rolls, Chinese roll mills, backup rolls and rolls. It mainly supplies to Jiangsu, Hebei, Beijing, Zhejiang, Guangdong and other provinces and regions, and exports to Malaysia, Taiwan, Nigeria and other countries. A set of scientific and standardized production management system has been established, with 2 services as the guide, product quality as the life, constantly improving themselves, and supporting the development of products and markets with high-tech content. Customer satisfaction is our eternal goal.


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