In this casting method, metallic moulds are used which can withstand the high temperatures of molten metal. The permanent mould is made into two parts; both parts are hinged at one end and clamped at other end. Mould is pre-heated before filling the molten metal. After solidification mould is opened and casting is removed. Again it is closed and used for another casting without pre-heating since the heat from previous cast is usually sufficient to maintain the mould temperature.
Advantages
- Fine grain structure is obtained which results in better mechanical properties.
- Casting has good surface finish and closer dimensional tolerance.
- Casting is free from embedded sand.
- This process is economic for large production.
Disadvantages
- This process is not suitable for small production due to high cost of die.
- This process is more suitable for casting of low melting point metal or alloys.
- Mould life is limited.
- A complicated shaped casting is difficult to produce by this process.
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