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Highest contour accuracy and surface
quality
The TNC 640 dynamically calculates the
contour in advance. This enables it to adapt
the axis velocities early enough to the
contour transitions. It controls the axes
with special algorithms that ensure path
control with the required limits to velocity
and acceleration.
Special filters specifically suppress
machine-specific natural vibration. The
desired accuracy and a very high surface
quality are attained. Thanks to the short
block processing time of 0.5 ms, even
highly accurate contours with very high
resolution are not a problem.
Thanks to its digital design, the TNC 640
has control over the machine’s entire drive
system. Not only does the field-proven
digital drive technology from HEIDENHAIN
make high contour accuracy and rapid
machining at high speeds possible, but
also all control components of the TNC 640
are connected via digital interfaces.
Digital drive technology
The position controller, speed controller
and, if required, the current controller are
integrated in the TNC 640. The digital motor
control makes it possible to attain very high
feed rates. And the TNC 640 interpolates
simultaneously in up to five axes. To attain
the required cutting speeds, the TNC 640
control spindle speeds up to 60 000 min
–1
digitally.
Quick and reliable machining with high contour accuracy
– Uniformly digital control design
The Advanced Dynamic Prediction feature
(ADP) expands the conventional look-ahead
of the permissible maximum feed rate
profile and makes optimized motion control
possible to produce clean surfaces and
perfect contours. ADP shows its strengths
for example during bidirectional finish
milling through symmetrical feed behavior
on the forward and reverse paths as well
as through particularly smooth feed rate
curves on parallel milling paths.
NC programs that are generated on
CAM systems (negatively) influence the
machining process through various factors
such as short step-like contours, coarse
chord tolerances and heavily rounded end-
point coordinates. Through an improved
reaction to such influence quantities and
the exact fulfillment of dynamic machine
parameters, ADP not only improves the
surface quality of the workpiece, it also
optimizes the machining time.
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