Question

Consider the following statements.

(1) Hot chamber machine is used for casting zinc, tin and other low melting alloys

(2) Cold chamber machine is used for die casting of ferrous alloys

(3) Rapid cooling rate in die casting produces high strength and quality in many alloys

Which of these statements are correct? 

1. 1,2 and 3
2.  1 and 2 only
3. 2 and 3 only
4. 1 and 3 only

Answer 1

Correct Answer - Option 4 : 1 and 3 only

Concept:

Die casting:

It is a moulding process in which the molten metal is injected under high pressure and velocity into a split mould die.

Die casting is categorized two types namely -

• Hot chamber and cold Chamber.
• Metals like Zinc, tin, and lead alloys are cast in hot chamber die casting having melting point below 390°C whereas aluminum alloys are cast in cold chamber die casting machine.
• Most die castings are made from non-ferrous metals, specifically zinc, copper, aluminium, magnesium, lead, pewter, and tin-based alloys.
• The higher the cooling rate, the finer will be the grain and higher will be the strength.