Olympic Runners with Sinumerik and ShopMill Olympic Runners ...

8
TRENDS
Bobsled Racing
Following the transfer of the CAD/CAM
program to the Sinumerik 840D, the program
parts for roughing the entire contour,
finishing the slopes of the runners and for
finishing the running surfaces were linked
via a main program, and then executed
directly from the hard disk
The Olympic
champion
Sandra Kiriasis
looks confidently
ahead
to the next
bobsled season
equipped with
new runners
based on the
tried-andtested
runner
geometry
It proved particularly advantageous
that even large programs
could be edited in the control,
for example, the approximately
5 MB finishing program for the
runners, which contains about
100,000 lines.
The high number of points results
from a uniform distribution
of points, and thus a high accuracy
as well as a very smooth surface.
The integrated high-speed
settings Cycle832 ensures a high
and dynamic machining speed. It
activates all of the functions required
for the mold making. These
include the Look Ahead function
with resurfacing through grinding
and torque dampening, which
assumes an adjustable number
of traversing sets, thus optimizing
the machining speed.
In addition, the precontrol was employed
to prevent contouring errors during machining,
along with a COMPCAD online compressor,
which is recommended in particular
for milling freeform surfaces. In keeping
with tolerances set in Cycle832, it appropriately
combines a sequence of G1 commands
and compresses them into a splice, which
can then be executed directly by the control.
Sandra Kiriasis accepting the finished bobsled runners
from the manufacturers (from left: Wolfgang Reichart,
Siemens, Torsten Schweigert and Michael Becker, Iscar,
Manfred Buchner, Siemens and Walter Schmidt, Sescoi)
milling 2nd hole, roughing and finishing as
well as engraving cycle with company logo.
Shinny runners with Sinumerik
After the premilling of the runner contour,
it was time to process the key runner parts,
the running surfaces. The CAD/CAM program
generated from the Work NC CAM
All pictures: W. Geyer
software with a postprocessor adapted to
the Sinumerik 840D was transferred to the
control via USB. The program comprises
three parts: roughing the entire contour,
finishing the slopes on the runner and finishing
the running surfaces. The program
parts were linked via a main program and
then processed directly from the hard disk.
Smooth results
By combining Sinumerik 840D, a highspeed
control with a high information flow
rate and low record-changing times, the
ShopMill operator interface and the Work
NC CAM software, a precision machined
part was created from an unmachined one
in a very short period of time. The new bobsled
runner made of the prescribed standardized
steel has exactly the same geometry
as the previous, very successful one
made of a special material mix.
Sandra Kiriasis was not the only one enthusiastic
about the results: the surface of
the workpiece, the running surface of the
runner in this case, was extremely smooth
and almost as polished as a mirror.
The Olympic champion enthusiastically
accepted her new “old” runners. Bring on
the race for the slimmest of margins in the
ice chute.
More information:
www.siemens.com/sinumerik
E-mail: wolfgang.reichart@siemens.com
motion world 1/2007