Regarding the selection of mold materials (5)

<<Metal Molds>>
Iron, aluminum alloys, zinc alloys, and bronze are used, each with distinct characteristics that make selection difficult. Generally, smaller items are better suited for zinc alloy bronze and aluminum alloys, while larger items are more appropriate for aluminum alloys.
[Characteristics]
- Iron is relatively inexpensive compared to other metals, but it is not widely used due to rusting and the difficulty of machining exhaust holes.
- The surface of cast items is best with zinc alloy, but pressure casting can produce aluminum alloys with minimal finishing required.
- Both bronze and zinc alloys have good machinability without issues, while aluminum alloys have inferior workability.
- Small items are not affected by weight, but larger items are better suited for aluminum alloys due to their light weight.
- They have good thermal conductivity, making temperature control of the mold relatively easy and suitable for high-speed molding.


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