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A special steel enterprise specializing in the production, research and development and sales of high alloy steel forgings
17
2021
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11
Life and flaw detection standard of cold roll
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Cold roll in the process of work to bear a lot of rolling stress, coupled with the weld, inclusions, edge cracks and other issues
The main links of the cold roll manufacturing process are melting, forging, heat treatment, processing and inspection. Cold roll in the working process to bear a lot of rolling stress, coupled with the weld, inclusions, edge cracks and other problems, easy to lead to instant high temperature, so that the work roll is subjected to strong thermal shock, resulting in cracks, sticky roll, peeling and even scrap. Therefore, the cold roll should have the ability to resist cracking and spalling caused by bending stress, torsion stress and shear stress, as well as high contact fatigue strength, high fracture toughness and thermal shock strength. Therefore, how to improve the service life of the roll has always been a major problem facing the roll manufacturing industry. The inspection of the roll is usually carried out with an acoustic flaw detector. In the cold roll flaw detection standard, the roll body is usually divided into surface area, central area and intermediate area according to the force situation, and then the critical size of the allowable defects in each area is specified according to the principle of fracture mechanics. Flaw detection workers should have the knowledge of roll manufacturing, in order to determine the nature of defects, but also should have the knowledge of roll use, in order to estimate whether these defects may cause service damage under specific conditions of use.
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