28
A
English
⋅
Nautilus
®
CC plus
⋅
Nautilus
®
T
en
Basic principles: Work
BEGO alloys can be selected on the start screen. A
selection is necessary to set up the correct casting
parameters.
Third party alloys can be stored on additional
program memory locations and be deleted, as
needed.
Casting and preheating temperatures
The casting temperatures indicated for BEGO alloys
in the program tables apply to the standard wax-ups
described in this operating manual. Because of the
numerous parameters that influence the casting
result, these casting temperatures can only be
regarded as reference values.
It is very important to provide for an adequately
preheated mould, which is placed in the device
immediately before the melting process in order to
minimize cooling. The preheating temperatures
stated in the operating manual should be complied
with even if casting has previously been performed
successfully at low mould preheating temperatures.
Due to automatic casting*) at the ideal casting
temperature, a mould that is too cool can cause the
melt to solidify prematurely, whereas this could still
be compensated for with manual casting at a higher
casting temperature.
*) Only NAUTILUS
®
CC plus
Crucible inserts
Special alloy groups require a ceramic crucible with
either a graphite or glassy carbon insert for melting
(see program tables). A glassy carbon insert can be
generally used instead of a graphite insert. It has a
significantly longer service life than the graphite
insert. The alloy is then indirectly heated via the hot
insert. To make sure that all the alloying compo-
nents have attained the casting temperature,
preheating is carried out up to the liquidus point
(when the melt becomes liquid). The casting
temperature is also maintained for a certain time
during the melting process before the readiness for
casting message is displayed.
Alloys with a high palladium content are generally
cast without a crucible insert. A glassy carbon insert
can be used if the alloy chips rise during the heating
process and thus do not have the proper temper-
ature (failed "incorporation" in the induction field):
•
a graphite insert for palladium contents of up to
30%,
•
a glassy carbon insert for palladium contents
over 30%, which reliably prevents carbon from
being absorbed by the alloy.
NOTE
• Graphite inserts are subject to wear and must
be replaced in good time! Used inserts can be
identified through their weight (
graphite ~6 g,
glassy carbon ~5 g
) and also by the fact that
the temperature increase during the melting
process slows down from one casting process
to the next. The casting temperature can no
longer be attained with worn graphite inserts!
• Graphite inserts are sensitive to impact and
must only be used in flawless condition. In par-
ticular, cracks will cause the casting process to
be aborted.
Summary of Contents for 39701001
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