Conditioning work rolls on a five-stand 1200 mill after metal build-up

One of the most characteristic defects on the work rolls of cold reduction mills is lamination. Lamination takes place on the work rolls of the five-stand 1200 mill at our combine due to damage to the surface of the roll body by metal build-up, which increases thermal stresses. The increase in therm...

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Bibliographic Details
Published in:Metallurgist (New York) 1984-01, Vol.27 (5-6), p.182-183
Main Authors: Novak, LSh, Baklushin, L N, Dobronravov, AI, Pavlov, I M, Vorozhbitov, V V, Monat, Z G
Format: Article
Language:English
Subjects:
composite materials
crack propagation
disks
grinding
metallurgy
rolling mills
stress
thermal variables measurement
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Summary:One of the most characteristic defects on the work rolls of cold reduction mills is lamination. Lamination takes place on the work rolls of the five-stand 1200 mill at our combine due to damage to the surface of the roll body by metal build-up, which increases thermal stresses. The increase in thermal stresses in turn leads to cracking. To ensure good roll performance, it is necessary to remove the surface layer damaged by metal build-up, since defects accumulate quickly in this layer. When slight amounts of metal (less than 0.3 mm) are removed, cracks are not removed from the surface of the roll, and a fatigue crack will begin to grow with subsequent service. Such cracking will in turn lead to lamination of the roll surface. The technology for conditioning work rolls after the removal of built-up metal consists of the following: the work roll is placed on a roll-grinding machine, the built-up metal is ground off, and the grinding disk is used to cut into the roll at this site to check for the presence of cracks. After any cracks found are removed, the roll is ground according to the regimes shown.
ISSN:0026-0894