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Variation in wall thickness occurs due to _________ core boxes.

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in Foundry and Forging by (110k points)
Variation in wall thickness occurs due to _________ core boxes.

(a) Rigid

(b) Flexible

(c) Surface finished

(d) Worn out

This question was posed to me during an online exam.

Question is from Casting Defects topic in portion Concept of Gating and Risering of Foundry and Forging

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Best answer
The correct choice is (d) Worn out

The best explanation: Worn out core boxes give oversize core dimensions. Worn out core prints allowing a core to float or move. Inadequate core print areas permit lifting of the core due to the buoyancy of molten metal. Hence the variation in wall thickness occurs.

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