The document discusses injection molds used in the die casting process. It describes that molds are made of steel and withstand high mechanical and thermal loads. The mold contains a fixed and mobile half, with the fixed half containing the trough or hole shot for molten metal to flow into the mold cavity. Other parts of the mold include the cavity where the part is molded, cooling channels to regulate temperature, and ejector bars to remove the casting. The design of the steel mold is critical for a long service life and quality parts.

1. Injection Moulds
English Version
In the die casting process mould injection is the
tool use in obtaining the piece you want to make.
In this manufacturing process molds withstand
high mechanical and thermal loads and for these
reasons moulds are made of steel (permanent
moulds).
In the cast we can distinguish two parts: the fixed half-mould, which is attached to the
fixed mould carrier machine, and the mobile half mould, which is attached to the
moving mould carrier machine The fixed half mould contains the trough (for hot
chamber machines) or the hole shot (for cold chamber machines) allowing the molten
metal to flow into the mould cavity. Therefore, the trough coincides with the nozzle of
the injector for H.C. machines while the hole coincides with the camera shutter
trigger for C.C. machines.
In the mobile half mold is located the expulsion side and therefore the opening and
closing movement is transmitted only in this part of the mould.
Other parts of the mould are:
• Cavity: is the volume in which the part will be moulded.
• Channels: are conduits through which the molten material flows due to the
injection pressure up to the cavity (part).
• Cooling channels: are channels through which coolant circulates (most
commonly water) to regulate the temperature of the mould. The cooling should
be as homogeneous as possible throughout the cavity in the both parts of the
mould (fixed/moved).
• Ejector bars: When the mould is opened, these bars can push the casting out of
the cavity, and can sometimes enlist the help of a robot to perform this operation.
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2. Injection Moulds
English Version
The design of a steel mould is critical, a suitable design in the mould will allow a long
service life and optimum part quality throughout its lifetime.
The most important properties that should have an injection mold are thermal shock
resistance and softening at elevated temperatures. Other important properties are the
hardness, machinability, resistance to thermal fatigue, weldability, availability and
cost of the array itself.
Mould for injection die casting hot chamber machine Parts of a Zamak die casting mould
Mould for injection die casting cold chamber machine Parts of an Aluminium die casting mould
Bibliography:
- Fundición a presión – E. Brunhuber; Editorial: Gustavo Gili S.A.
- Website Custompart – http://www.custompartnet.com/wu/die-casting
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