Question

For complicated shapes, it is better to use collapsible metal cores rather than a single metal core in the casting.

(a) True

(b) False

This question was posed to me during an internship interview.

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

Answer 1

Correct choice is (a) True

To explain: It is difficult to securely position the metallic core as a single piece due to the dimensional variations that are likely to occur. So the collapsible metal cores (multiple piece cores) are sometimes used in permanent moulds, but the designer has to provide coarse tolerance on the dimensions.