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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