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Bending Definitions
Bend Allowance – The length of the arc through the bend area at the
neutral axis.
Bend Angle – The included angle of the arc formed by the bending
operation.
Bend Compensation – The amount by which the material is stretched or
compressed by the bending operation. All stretch or compression is assumed
to occur in the bend area.
Bend Lines – The straight lines on the inside and outside surfaces of
the material where the flange boundary meets the bend area.
Inside Bend Radius – The radius of the arc on the inside surface of
the bend area.
K-factor – Defines the location of the neutral axis. It is measured
as the distance from the inside of the material to the neutral axis divided
by the material thickness.
Mold Lines – For bends of less than 180 degrees, the mold lines are
the straight lines where the surfaces of the flange bounding the bend area
intersect. This occurs on both the inside and outside surfaces of the bend.
Neutral Axis – Looking at the cross section of the bend, the neutral
axis is the theoretical location at which the material is neither compressed
nor stretched.
Set Back - For bends of less than 180 degrees, the set back is the
distance from the bend lines to the mold line.
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