Mô tả
Die casting
is a metal casting
process that is characterized by forcing molten
metal
under high pressure into a mould cavity
. The mould cavity is created using two hardened tool steel
dies
which have been machined into shape and work similarly to an injection mould
during the process. Most die castings are made from non-ferrous metals
, specifically zinc
, copper
, aluminium
, magnesium
, lead
, pewter
, and tin
-based alloys. Depending on the type of metal being cast, a hot- or cold-chamber machine is used.
The casting equipment and the metal dies represent large capital costs and this tends to limit the process to high-volume production. Manufacture of parts using die casting is relatively simple, involving only four main steps, which keeps the incremental cost per item low. It is especially suited for a large quantity of small- to medium-sized castings, which is why die casting produces more castings than any other casting process.
[1]
Die castings are characterized by a very good
surface finish (by casting standards) and dimensional consistency.
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