Focus on coil processing
Straight an d level
ISMR examines the process
A corrective leveler has power-adjusted
back-up rolls to allow a user to work the
and elements involved material in specified regions, as required, to
in the development of a
flatten the strip. A coil that has edge wave
requires the centre of the strip to be worked
corrective leveler
and stretched to have the same length mate-
rial as the outside edges. In centre buckle
U
nderstanding the difference between Top: Three
applications, just the opposite is required.
a corrective leveler and a straight-
levelers from
The centre of the material is longer than the
ener is key when specifying what
B&K
edges so the edges of the material must be
type of equipment is required for certain
worked to be the same length as the centre,
coil processing jobs. A straightener will only
resulting in flat material exiting the correc-
correct for coil set and some cross bow as it
tive leveler.
has no adjustable back-up rolls. These coils
Levelers have traditionally been considered
have typically already been leveled and
as just being used in cut-to-length or blank-
only have the memory from being wound
ing applications in the past. This is because
up (coil-set) within them. This condition
service centres often obtain coils directly
can be corrected by using a straightener
from steel mills and these coils sometimes
and adjusting the head-tilt based on mate-
have edge wave and centre buckle present
rial thickness from entry to exit to flatten
which need to be removed before producing
the strip. Coils that have other conditions,
blanks.
such as edge wave or centre buckle, require
However, in today’s press feed market seg-
the use of a corrective leveler to obtain flat
ment, more and more people are looking
material from these coil conditions.
to process HSLA (high strength low alloy)
48 March/April 2007 International Sheet Metal Review
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