The SIROLLCIS Flatness Gauge utilizes the
stereoscopic camera principal to overcome the inherent
problems of hot strip and plate width and shape
measurements, such as passline and thickness variations
or tilt, lift and bounce of the strip at the exit of the
last finishing stand.
Flatness or manifest measurement is specifically aimed
at accurately mapping the changing shape of the strip as
it passes through the camera’s field of view and
displaying the results in a variety of ways including
units of strain (I-units).
By projecting a number of laser stripes onto the top
surface of the metal strip, the system is able to
continuously determine the complex surface wave patterns
both across and downweb. Using fast fourier transforms,
the complex wave patterns are broken down into their
respective frequencies and amplitudes, filtered and
analyzed to determine the units of downweb strain in a
number of specific regions.
Crossweb profile scans up to the extremities of the
steel strip edges enable full strip width evaluation
without the need to move cameras and or laser beams. In
addition, due to the crossweb profile measurement, true
width values can now be measured irrespective of any
curvature of the surface “canoeing”. Successive scans
are used to build up an image of the surface and
visually display the flatness shape on the HMI screen.
The SIROLLCIS Flatness Gauge is a relatively new product and currently has over seven reference sites worldwide.