Inspection of mill rollers
The metal’s state inspection using the MMM method on working and backup rolls
before and after carrying out of reconditioning repair technologies on them
allows assessing the quality of these technologies, the structural changes, as
well as the level and the distribution of residual stresses. Inspection of new
rolls at the manufacturing plants using the MMM method provides the possibility
to carry out the quality assessment of the production technology itself.
Fig.1 shows the scheme of the inspection by the MMM method on the working
surface of the rolls.
Fig.1. The scheme of the inspection by the
MMM method on the working surface of the rolls: --- the zone of the roll’s working surface
inspection; 1, 2, 3, 4, 5, 6 – numbers of sections; -> - the direction of movement of the recording
device of the TSC-type instrument.
Fig.2 shows the inspection results, obtained using the MMM method, of the
?350 (section 6 according to the scheme of fig.1) backup shaft of the
strip-feeding plant before the heat treatment “by extraction” (fig.2, a) and after the heat treatment (fig.2, b).
Fig.2a. Results of the
inspection by the MMM method before the heat treatment.
Fig.2b. Results of the
inspection by the MMM method after the heat