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Investment Casting (mould (problems (mould is soft and sticky (Too low…
Investment Casting
mould
natural rubber
:check: Excellent tear resistance,Ideal for intricate models,Very limited shrinkage,Requires only few release cuts
:red_cross: Difficult to cut,Requires more time for filling the frame,Requires the use of spray or talcum
silicone rubber
:check: The frame is filled easily,Easy to cut,Different hardness levels available,Gives a polished finishing
:red_cross: Shrinkage slightly higher than natural rubber ,Requires more release cuts, Good tear resistance but lower than natural rubber
“No shrink” pink
:check: Very low shrinkage, Very good surface finishing
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assembling the tree
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put wax patterns of similar shape, size and weight together.
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the angle recommended at about 45° – 60°. More recently, a larger angle of 70° – 80°
burnout
In the case of electric resistance heating, prefer ovens with forced ventilation.
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the oven should be equipped with a double control system, with a thermocouple in the work chamber and another one near the heating elements.
design
use of CAD systems, availability of a dimensioned drawing is a great help to the work of the model maker.
Sharp changes of cross-section should be avoided. Otherwise adequate feed sprues should be provided.
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alloy
yellow&red gold alloys
Gold-titanium
gold – 1% titanium alloy, Au990Ti
Gold-cobalt-antimony
patented alloy, 99.5% gold-0.3% antimony-0.2% cobalt, Au995Sb3Co2
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Gold-gallium
gold – 1% gallium alloy, Au990Ga
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