Special Functions For Free-Form Surfaces - Siemens SINUMERIK 840D Manual

6.1
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Complex free-form surfaces
6.1

Special functions for free-form surfaces

When machining free-form surfaces, surface quality is the top priority. This calls for a corre-
spondingly high level of accuracy for the CAM data with small tolerances and a large number of
intermediate points.
The large number of points results in even distribution, thereby ensuring a high level of accuracy
and an extremely smooth surface. The integrated high speed setting cycle (CYCLE832) ensures
a high machining speed. This cycle is responsible for activating all the functions that are required
for milling free-form surfaces. This includes the Look ahead function featuring smoothing and jerk
limitation, which anticipates a configurable number of traversing blocks so that the machining
speed can be optimized.
In addition, feedforward control has been implemented to ensure that machining is free from fol-
lowing errors. This is supplemented by the COMPCAD online compressor, which is specifically
recommended for free-form surface milling applications. This brings together a sequence of G1
commands in accordance with the tolerance set in CYCLE832 and compresses them into a
spline that can be executed by the control directly.
Key functions for machining free-form surfaces:
High speed settings CYCLE832,
as optimum data compression within the tolerance band, combined with feedforward control
and jerk limitation, can be set for the required surface finish without contour deviation.
TRAORI,
as it has an integrated 5-axis transformation feature for all kinds of machine kinematics,
enabling the tool to be perfectly oriented in relation to the surface so that no contour or sur-
face defects can occur.
VCS,
as maximum accuracy is required in conjunction with extremely large workpieces. Particularly
applicable when making compression molds and templates in an automotive engineering
context.
Integrated process chain from generation in CAD through to execution on the CNC.
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