Question

Which of the following process is not used to remove the cores from the finished casting?

(a) Blowing

(b) Melting

(c) Washing

(d) Chemical Dipping

This question was posed to me during an interview.

This is a very interesting question from Cores and Core Prints topic in division Foundry Introduction of Foundry and Forging

Answer 1

Correct choice is (b) Melting

Explanation: When the air is blown, the particles of the burnt core are removed. Similarly, the washing and chemical methods are used when the adhesive properties of the core particles are high. The core melts when the hot metal is poured over it. Hence, this process cannot be used for cleaning.