Indutherm MC60V - Collection of Spoiled Castings

System
description
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2019-01-08
4–24
4.20 Collection of spoiled castings
Horizontal flashing or finning
Figure 18: horizontal flashing or finning
Cause
Remedy
 Incorrect powder / water ratio (too much
water).
 Using correct amount of water (espe-
cially important with vacuum investing
machines).
 Work time of investment not used up.
 Ensuring the work time is used up and
slurry temperature is 20 – 22 ºC.
Other flashing or finning
Figure 19: other flashing or finning
Cause
Remedy
 Work cycle too long. Investment begin-
ning to set while still under vacuum.
 Ensuring the work cycle is not too long
and slurry temperature is 20 – 22 ºC.
 Disturbing the flasks too soon.
 Leave the flasks for at least one hour
undisturbed.
 Heating too quickly during de-wax.
 Do not put the flasks in the hot oven. Do
not exceed 150 ºC during de-waxing.
 Moulds allowed drying out before burn-
ing out.
 If not burning out the same day, keep
moulds wet by covering with wet sack-
ing or plastic sheets.