Question

Better collapsibility of core sand in core making process can ease the cleaning of castings.

(a) True

(b) False

This question was posed to me in final exam.

The origin of the question is Core Making Machines topic in portion Foundry Mechanizations of Casting-Forming-Welding I

Answer 1

Right option is (a) True

To explain I would say: The core sand must be collapsible in nature, i.e. it should be disintegrate easily after the metal solidifies in the mould cavity, this property can ease the cleaning of the castings. For a sufficient degree of collapsibility, adequate core binders should be used in core making process which also increases strength of core.