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In permanent mould casting, only the metallic type of cores can be used, as the mould material used is also metallic.

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In permanent mould casting, only the metallic type of cores can be used, as the mould material used is also metallic.

(a) True

(b) False

The question was asked in a job interview.

My question is from Permanent Mould Casting in portion Special Casting Techniques of Casting-Forming-Welding I

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Right answer is (b) False

The explanation: Cores are used in permanent mould casting for making any hollow portions in the casting. The cores can be made out of metal or sand also when sand cores are used in the casting, the process is called semi-permanent moulding. The sand core of complex shapes can be used with undercuts easily in the casting.

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