Question

In vacuum die casting, the melt enters into the mould cavity with less speed than that in the die casting technique.

(a) True

(b) False

I have been asked this question during a job interview.

Enquiry is from Casting Techniques topic in portion Casting Process of Casting-Forming-Welding II

Answer 1

Correct choice is (b) False

Best explanation: In the vacuum die casting method, the removal of all the gases from the cavity makes the vacuum inside the mould cavity, so the force and pressure are negligible in magnitude inside the mould cavity which could be opposite to the injecting pressure of the melt. So, the melt enters into the die with very high speed which also decreases the filling time of melt.