Die Casting

Gravity Die Casting

Gravity die casting process

Mazak, an alloy of Zinc and aluminium, is first melted in a crucible furnace.

Molten metal is then poured by ladle in to an open steel mould where it is allowed to cool and solidify.

Gravity die casting process

The mould is then turned upside down and tapped with a hammer to release the finished casting.

Gravity die casting requires minimal finishing and waste as minimal because excess metal can be melted down and used again.

Things that you may recognise

Things that are made from gravity die casting are:

Toaster -

Lawnmowers -

Car wheel rims -

Identifying the process

When something has been created by gravity pressure die casting there would be:

Section hair lines

ejector pin marks

sprue and runner marks

Materials

The materials used in gravity die casting is a mixture of Zinc and aluminium.

Zinc -

Aluminium -

High pressure die casting

High Pressure Die Casting

Forcing metal under high pressure to form a mould.

These moulds are called dies and are made from steel.

This produces non-ferrous metals.

Materials used

Metals that are commonly used are also:

Aluminium -

Zinc -

What is made from the process

In this process you can make:

Golf club heads -

Car engine blocks -

Radiators -

High pressure die casting process

 First the mould is sprayed with lubricant and closed.

Molten metal is then injected into

the mould under high pressure.

High pressure die casting process

Once the cavity is filled, the pressure is kept at a steady level until the casting has become solid.

Finally, the die is opened and the casting

is injected.

Identifying the process

When something has been created dy high pressure die casting there would also be:

Section hair lines

ejector pin marks

sprue and runner marks