Work roll inspection
Work rolls have a very important role in the rolling process as they need to have a special finish (roughness) that will be applied onto the surface of the strip.
Up until now it has been assumed that the fine structure has been finished after machining. Defects such as shatter marks only become visible on the strip, after the rolling process, during inspection in the laboratory.
By using the roll inspection monitor, this additional step can be eliminated as the defects can now be seen on the surface of the roll directly. In the case of a defect being detected the machining can be continued. Otherwise the roll is ready for use.
The figure on the right shows a sample configuration for the inspection of working rolls up to 850 mm in length. The monitor can be adjusted infinitely to roll diameters ranging from 40 to 140 mm. The system can be adapted to suit other dimensions on request.
To visualize the defects, a laser device illuminates a roll section of 70 mm length that will be projected onto a white screen where the operator can see the surface defects in a larger scale. The operator rotates the roll and adjusts the lever, comprising the laser module, by hand to inspect the complete surface.
Imperfections are immediately detected by the operator allowing a quick and reliable detection of defects such as shatter marks, and others.
This helps the operator to decide whether they have machined as much as necessary to remove defects or if additional machining is needed. Often, over-generous machining has been applied to ensure the removal of all defects. With the iLux work roll inspection system, the amount of machining can now be defined exactly.