Question

In permanent mould casting, the mould is pre-heated to its operating temperature before the actual use of mould.

(a) True

(b) False

I got this question in an international level competition.

Enquiry is from Permanent Mould Casting topic in portion Special Casting Techniques of Casting-Forming-Welding I

Answer 1

Right choice is (a) True

The best explanation: When the casting is done with the cold die, the first few castings are likely to have misruns (Misrun is caused when the metal is unable to fill the mould cavity completely) till the die reaches its operating temperature. To avoid this, the mould must be pre-heated to its operating temperature, preferably in an oven.