As a generalization, the process used to manufacture a casting is dependant on the quantity required. The volume of castings can be used to justify more expensive tooling to reduce the unit price.

As an example, say an aluminium casting would cost £10.00 as a sandcasting and the pattern equipment costs £300 and as a diecasting the unit cost would be £3.00 and the tooling £2000 then diecasting would be justified if the quantity purchased exceeded  250 giving payback in the first year.

However, only non-ferrous materials can be diecast. LEW diecast LM6, LM25 and AB1 (aluminium bronze).

Gravity Diecastings

The process of gravity diecasting involves utilizing a steel or cast iron die which has the metal poured in from the top and the cavity fills by gravity. This process is generally used where hundreds or low thousands of castings are required annually.

High Pressure Diecasting

Pressure diecasting is used where many thousands of castings are required annually and this type of casting can be supplied in LM24, LM6 and various zinc alloys. The same calculation would apply for Pressure diecastings as this method gives much lower unit costs but significantly higher tooling costs.

Diecastings are available in:

  • Aluminium (LM25 & LM6)
  • Bronze (AB1,AB2 & LG2)
  • Gunmetal
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