Question

For faster cooling, fins are provided __________ the permanent mould.

(a) Inside

(b) Outside

(c) At the surface

(d) Near the end

This question was posed to me in an international level competition.

The query is from Gravity Die Casting in portion Moulding Machines & Special Moulding Processes of Foundry and Forging

Answer 1

Right choice is (b) Outside

Explanation: The pouring cup, sprue, gates and the risers are built inside the mold halves itself. The fins and other projections are provided on the outside of the permanent mould as they ensure faster cooling of the casting.