The FSBA (Flexible Shaft Backing Assemblies) has been developed
for a 20-high Sendzimir mill. This new shape control actuator was
supported by a shape analysis model based on the distribution of
geometrical moment of inertia in the roll axial direction. The shape
control range was doubly extended by the introduction of FSBA. It
was confirmed on an industrial mill that quarter buckles are suppressed
under a wide range of rolling conditions by shape control with
FSBA and concave rolls.