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Rough patterns are difficult to withdraw from CO2 molding.

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+1 vote
in Foundry and Forging by (110k points)
Rough patterns are difficult to withdraw from CO2 molding.

(a) True

(b) False

I had been asked this question during an interview for a job.

The query is from Carbon Dioxide Mould in division Moulding Machines & Special Moulding Processes of Foundry and Forging

1 Answer

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by (736k points)
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The correct option is (a) True

The explanation: Since gassing hardens the sand mass, a pattern having a rough surface may become difficult to withdraw from the mould. However, this can be overcome if the pattern has been rubbed with graphite before ramming the sand around it.

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