Question

In hot chamber die casting, the plunger is also used for taking back of unused molten metal to the gooseneck after the fulfilling of the cavity.

(a) True

(b) False

I have been asked this question in semester exam.

Question is from Die Casting in section Special Casting Techniques of Casting-Forming-Welding I

Answer 1

Right choice is (a) True

Explanation: After the filling of molten metal into the cavity, somewhat of melt still remains in the nozzle or sprue part. To avoid the wastage of melt, plunger is used, which by moving back returns the unused liquid metal to the gooseneck. This process saves a lot of molten metal and hence economizes the production.