Instruction manual

OPERATING_MANUAL_MC20V.DOC 18.03.11 KS Seite 27
Cobalt-chromium,
steel alloys
Set heating power to P080 (80%).
Use the ceramic crucible for steel.
Put in crucible, set in flask. Push “Start”
twice to start heating and vacuum. If full
vacuum is there for at least 30 seconds
(see timer) increase heating power to
P100 (100%) and cast when metal is
ready.
One more problem of NiCr, CoCr and
steel alloys: some alloys tend to splash
in molten condition and under vacuum. In
this case it is useful to change setting of
parameter P060 = limitation of vacuum.
For standard application set of -21- is O.
Setting of -21- into 1 means max.
vacuum is –0.90bar,
P060 into 2 means max. vacuum is -
0.80bar. Please change back after
casting to standard set!
3.16. Casting temperatures
The casting temperature depends on metal alloy and style of castings:
High melting point of metal needs high flask temperatures, thin and delicate pieces
with long flow ways too.
Low melting point of metal needs lower flask temperatures, heavier massive pieces
too.
Ask metal supplier about their recommendation.
List of Recommended Flask Temperatures
Flask temperature in °C
Metal
Melting point
Pieces
thin
Pieces
medium
Pieces
heavy
Aluminium
720°C
300
250
200
Silver 925
980°C
650
600
400-600
Y. gold 14 ct
950°C
620
600
400-600
Y. gold 18 ct
1050°C
620
600
400-600
W. gold 18 ct
1150°C
620
600
400-600
W.gold 18 ct Pd
1300°C
650
630
400-600
Steel
900
800
700
Palladium
950
900
870
Platinum
950
900
850