Instruction manual

OPERATING_MANUAL_MC20V.DOC 18.03.11 KS Seite 20
3.8. Casting programs MC20V
Casting programs MC20V Version _02 since August 2011
Preprograms_MC20V_02
Graphite crucible with
thermocouple reading
Ceramic crucible with holder and
pyrometer reading
Material
Silver
935/Cu
Yellow
gold 18k
950Pt
CrCo
stainl. steel
950Pd
Program
No.
10
11
12
13
14
Temperature*
°C
1000
1080
2000
2000
2000
Pyrometer correction
%
0100
0100
0100
0115
0100
Heating power
%
0050
0050
0100
0100
0100
Washing before heating
0000
0000
0000
0000
0002
Washing while heating
0000
0000
0000
0001
0000
Melting pressure**
bar
-1.00
-1.00
-1.00
-0.90
-1.00
Casting pressure start (in ° or
seconds)
°
60°
60°
60°
60°
60°
Casting pressure
bar
2.00
2.00
3.00
2.00
3.00
Vibration
sec
0030
0030
0030
0030
0030
Label
935/Ag
750/YG
950Pt
CrCo
950Pd
*
Temperature: Please see the alloys data sheet for recommended casting temperature.
**
Melting pressure: When the display shows “Melting”, the melting pressure can be applied at any
time by pressing the “Start” button again.
***
Casting should be as fast as possible. The temperature controlling takes too long. The casting
needs to be done by vision. Once the material is liquid wait 5-10 seconds and then cast!
3.9. A suggestion for a general casting process:
Open cooling water supply
Open protective gas supply
Switch on main switch
Switch on vacuum pump ( the pump will no operate if you start it against full
vacuum)
Insert crucible with material into the quartz glass tube inside the inductor.
Select the correct flask holder for your flask
Place flask holder into the casting chamber. The holder can be fixed to keep
flasks of 50-80mm length in 5mm steps.
Place flask in the flask holder. Close and lock casting chamber.
Select desired program.
Press "Start" button
Follow the instructions on the LCD screen
If casting temperature is reached (see data sheet of manufacturer of the alloy)
press the button on the handle to release and tilt the unit uninterrupted
clockwise till the catch. Release the button on the handle to lock the unit in the
tilted position. During the tilting the unit automatically switches from vacuum to
overpressure inside the casting chamber. The generator stops. On the display
"Time" a timer counts the seconds after casting.
After a sufficient waiting time, unlock the handle and tilt the unit back to
horizontal position. The vacuum inside the crucible chamber is released by
protective gas to ambient pressure.