Die casting-power-point

Die CastingDie Casting
By Jonathan GordonBy Jonathan Gordon
and Leeand Lee

Gravity Die CastingGravity Die Casting

Gravity die castingGravity die casting
processprocess
 Mazak, an alloy of Zinc and aluminium, is firstMazak, an alloy of Zinc and aluminium, is first
melted in a crucible furnace.melted in a crucible furnace.
 Molten metal is then poured by ladle in to anMolten metal is then poured by ladle in to an
open steel mould where it is allowed to cool andopen steel mould where it is allowed to cool and
solidify.solidify.

Gravity die casting processGravity die casting process
 The mould is then turned upside down andThe mould is then turned upside down and
tapped with a hammerto release the finishedtapped with a hammerto release the finished
casting.casting.
 Gravity die casting requires minimal finishingGravity die casting requires minimal finishing
and waste as minimal because excess metal canand waste as minimal because excess metal can
be melted down and used again.be melted down and used again.

Things that you may recogniseThings that you may recognise
 Things that are made fromgravity dieThings that are made fromgravity die
casting are:casting are:
 Toaster-Toaster-
 Lawnmowers -Lawnmowers -
 Carwheel rims -Carwheel rims -

Identifying the processIdentifying the process
 When something has been created byWhen something has been created by
gravity pressure die casting there wouldgravity pressure die casting there would
be:be:
 Section hair linesSection hair lines
 ejector pin marksejector pin marks
 sprue and runner markssprue and runner marks

MaterialsMaterials
 The materials used in gravity die castingThe materials used in gravity die casting
is a mixture of Zinc and aluminium.is a mixture of Zinc and aluminium.
 Zinc -Zinc -
 Aluminium-Aluminium-

High pressureHigh pressure
die castingdie casting

High Pressure Die CastingHigh Pressure Die Casting
 Forcing metal underhigh pressure toForcing metal underhigh pressure to
forma mould.forma mould.
 These moulds are called dies and are madeThese moulds are called dies and are made
fromsteel.fromsteel.
 This produces non-ferrous metals.This produces non-ferrous metals.

Materials usedMaterials used
 Metals that are commonly used are also:
Aluminium-
Zinc -

What is made fromthe processWhat is made fromthe process
 In this process you can make:In this process you can make:
 Golf club heads -Golf club heads -
 Carengine blocks -Carengine blocks -
 Radiators -Radiators -

High pressure die castingHigh pressure die casting
processprocess
 First the mould is sprayed withFirst the mould is sprayed with
lubricant and closed.lubricant and closed.
 Molten metal is then injected intoMolten metal is then injected into
the mould under high pressure.the mould under high pressure.

High pressure die castingHigh pressure die casting
processprocess
 Once the cavity is filled, the pressure isOnce the cavity is filled, the pressure is
kept at a steady level until the casting haskept at a steady level until the casting has
become solid.become solid.
 Finally, the die is opened and the castingFinally, the die is opened and the casting
is injected.is injected.

Identifying the processIdentifying the process
 When something has been created dyWhen something has been created dy
high pressure die casting there wouldhigh pressure die casting there would
also be:also be:
 Section hair linesSection hair lines
 ejector pin marksejector pin marks
 sprue and runner markssprue and runner marks

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