Question

Which of the following parts is used in jolt moulding to ram the sand in mould?

(a) Biscuit

(b) Jolt

(c) Roller

(d) Overhead hopper

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

This question is from Methods of Ramming Mold Boxes topic in portion Mold and Mold Making of Casting-Forming-Welding I

Answer 1

The correct answer is (d) Overhead hopper

For explanation I would say: Basically, an overhead hopper is used in jolt mould method of ramming, in which after filling the sufficient amount of sand to the mould, an overhead hopper is raised to a certain height and then it is allowed to free fall on to a solid bed plate, which results into the ramming and packing of sand layers in the mould.