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The roll is made of metal of a production tool plastic deformation, under complex stress state in production, easy to roll failure, delamination, fracture, roller surface damage. In the roll failure forms, types of roller surface damage is more, also is a common failure forms, including roller surface crack, indentation, oxide scale exfoliation, slag, steel, abnormal wear etc..

1, the roller surface crack
The crack is divided into normal and abnormal crack crack crack, normal also called hot crack, is due to repeated temperature cycling thermal stress caused by the roll surface is gradually broken down, is a place to roll on the surface of the micro surface layer phenomena; non normal cracks during rolling is due to slippage, sticking steel, card steel, steel, and other accidents caused by heap tail thermal shock crack, in the roll surface form local crack certain depth and ductility.

2, the indentation
Mainly refers to the production process due to reasons for cleaning scale and other foreign matter caused by pressing, continuous or discontinuous distribution of irregular shape of the pits in the surface of roller.

3, oxide scale exfoliation
The rolling start, after a period of time after the hot roll, forming a layer of silver grey or light blue thin film on the surface of a roll, the roll surface for protection, workpiece surface quality is very important, because the repeated action of rolling force, caused the film along around carbide micro cracks; when the roller cooling capacity is insufficient, the roll surface is difficult to form a dense oxide film, even if the formation of oxide film will quickly deteriorate. In the rolling is not reasonable, the film quickly destroyed in the generation process, will cause the film falls off, leaving the meteor spots and other defects in the roll surface, caused by the roll surface roughness increased, wear increased.

4, sticking steel, abnormal wear etc.
The rolling roller surface adhesion caused by abnormal and workpiece, stick steel; rolling process parameters caused by the irrational width km roll consumption is too large, resulting in uneven wear of roll surface.

In production, we should standard operation, equipment maintenance to avoid the above aspects, the roller surface damage.