Casting
The flask
The flask is when the cope and the drag are in place together.Parting powder can be used to help separate the pattern from the sand.
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cope
drag
pattern
green sand
Pattern
Rounded edges
Tapered sides
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Runner and Riser
runner riser
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Equipment
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Safety
Aluminium is melted to very high temperatures so safety is extremely important.Melting points:-
Aluminium approx:- 660 cSteel approx:- 1330 c
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Crucible
The crucible is preheated. This removes any moisture from the furnace and crucible.
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Charging with Aluminium
Aluminium ingots are added.
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Adding Flux
Flux prevents oxygen entering the molten aluminium.If oxygen does enter the aluminium the final mould can contain bubbles which ruin the finish.
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Degassing tablet
This removes any impurities, in the form of gas.The gas fumes can be very dangerous.
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Pyrometer
When the temperature reaches 650 c it’s ready for pouring
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Pyrometer
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‘Dross’
Before pouring the ‘dross’ is removed. This is all the impurities which have risen to the top.
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Lifting tongs
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Pouring
Great care is needed as the molten aluminium is extremely hot.
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Pouring
The molten aluminium is poured in the runner.When the empty cavity is full the aluminium rises up the riser.
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