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Life and Flaw Detection Standard of Cold Roller

Article tags:Life and Flaw Detection Standard of Cold Roller

The main links of cold roll manufacturing process are smelting, forging, heat treatment, processing and inspection.

In the process of cold rolling, the rollers have to bear a lot of rolling stress, and the welds, inclusions and edge cracks of the rolled parts are easy to cause instantaneous high temperature, which will cause the work rolls to be subjected to intense thermal shock, resulting in cracks, sticking rolls, spalling and even scrap. Therefore, the cold roll should have the ability to resist cracking and spalling caused by bending stress, torsional stress and shear stress, as well as high wear resistance, high contact fatigue strength, high fracture toughness and thermal impact strength. Therefore, how to improve the service life of rolls has always been a major problem faced by the roll manufacturing industry.

Non-destructive testing of rolls is usually carried out by ultrasonic flaw detector. In the standard of cold roll flaw detection, the roll body is usually divided into surface area, center area and middle area according to the stress condition, and then the critical size of the allowable defects in each area is determined according to the principle of fracture mechanics. The flaw detectors should have the knowledge of roll manufacturing in order to judge the nature of defects, and also the knowledge of roll usage in order to estimate whether these defects may cause service damage under specific conditions.

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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