Focus on metal forming
rotate around its own axis) moves on the
The ‘dieless’ princi ple
sheet metal following a two-dimensional
course, straining incrementally according to
the geometry of the CAD model.
The tool then descends in the direction of
the ‘z’ axis, according to the pitch set, and
continues its movements downwards until it
has finished the working cycle.
1. Please click the window above to view
the set-up and start of machine
The mathematical model of the part is con-
verted into a digital-control tool run using
AFS (Amino Forming System) CAM software,
which has been specifically developed for a
dieless system. The tool’s run is then trans-
ferred to the machine’s 3-axis digital control
system. The flat sheet metal is locked into
2. Please click the window above to view
position on the supporting table and the tool the operational run of the machine
moves along the ‘y’ and ‘z’ axes.
Principles and applications
This process can facilitate the production
of complex 3D shapes, produce prototypes
rapidly and economically, can produce a
large variety of parts on one machine and is
simple to use. Noise levels are relatively low.
The ability to produce prototypes directly
from CAD models also reduces development
times and costs.
However, as the dieless working cycle is
generally longer, when compared with con-
ventional drawing and pressing processes, it
is probably better suited to the production
of prototypes and small batches. The Amino
dieless process has a manufacturing capacity
of 500 pieces or more per month.
It should also be borne in mind that work-
piece thinning is the dominant failure mode
and is related to a component’s surface
Above: The table moves in the direction of the angles. This imposes a limitation on formable
Forming ‘x’ axis and is fitted with a supporting table surface angles. For example, large angles may
with the
which counterbalances the vertical move- produce excessive thinning in the sheet metal
dieless
ment of the loose tool. Generating pressure blank. There may also be limited accuracy.
method
from the cylinders allows pre-tensioning According to the manufacturer, fixed tools
to be applied to the metal being formed, may be prepared with resins, wood, cast iron
if needed. The loose tool (which does not and steel, depending upon the shape, dimen-
International Sheet Metal Review May/June 2007 27
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