Indutherm VC 400 LCD, Instruction Manual, Page: 26 / 42

86014010_04_OPERATING_MANUAL_VC400_LCD_GB.DOC 25.11.2016 KS
page 26
4.3 Possible causes for dissatisfying casting results
Dissatisfying casting results can have various causes and, depending on the material,
can have various effects. The following "check list" is to help find the different causes:
1. Casting temperature is too low/too high.
2. Flask temperature is too low/too high.
3. Configuration of flask is disadvantageous ("branches" too thin or too close to
the top).
4. Flask is not totally heated up (at least 2 hours on end temperature).
5. Flask was slaked too early/too late.
6. Contamination in the alloy (for example "bad copper").
7. Material was not pre-alloyed/granulated.
8. Investment for flask was bad/old
9. Eventually not enough protective gas or the gas had water inclusions.
10. Wrong crucible position (different crucible temperatures).
11. Not enough vacuum inside the vacuum chamber (at least - 0.9 bar for good
casting).
12. Vacuum was turned on too late/turned off too early.
13. Contamination in the investment because of wax residues (steam out flasks).
14. Graphite contamination (use ceramic insert or crucible of better graphite quality).
Please note that INDUTHERM cannot be held responsible for dissatisfying casting
results.