Mould Cooling

Mould Cooling
It is necessary to remove heat from the part to freeze it and cool it below its softening
temperature before it can be remove. It is important to remove the heat rapidly, for fast
cycle time, and evenly to prevent warpage related to uneven crystallization. In multicavity
moulds, cooling must be uniform in all parts.
Mould temperature is controlled by circulating cooling water through conduits in the
mould. Cooling conduits must be carefully placed in the mould to ensure even cooling of
the part.
Hot spots may be encountered in areas around gates, due to shear heating, or in areas of
the mould which are difficult to reach with cooling conduits. Special metal inserts may
be used in these areas, made from material with high heat transfer rates, such as
beryllium copper.
Separate cooling channels can also be installed in these areas, operating with higher flow
rates or lower temperature cooling water than the rest of the mould.