Question

Which of the following devices is used for the formation of shell mould in the shell moulding procedure?

(a) Air roller

(b) Re-circulating ball roller

(c) Chucker

(d) Dump box

The question was posed to me in examination.

This intriguing question originated from Shell Moulding in portion Special Casting Techniques of Casting-Forming-Welding I

Answer 1

The correct answer is:

(a) Air roller

Explanation:

In the shell moulding process, an air roller is used to form the shell mould. This process involves creating a thin shell around a pattern, typically made of a metal such as aluminum or steel, by pouring a fine sand mixture onto the pattern and using an air roller to help compact and smooth the mould material. The air roller helps in achieving uniform thickness and compaction of the shell.

• Re-circulating ball roller (b) and chucker (c) are not used for shell mould formation. The dump box (d), typically used for shaking out sand or other loose materials, is also not used for the shell moulding process itself but may be used for other parts of casting processes.