Bissoy.com
Doctors Medicines MCQs Q&A

The die life is less for higher melting temperature alloys in gravity die casting.

The die life is less for higher melting temperature alloys in gravity die casting. Correct Answer True

The die life is less for higher melting temperature alloys such as copper and grey cast iron. Very high temperature of molten metal in contact with the moulding surface damages it and may cause surface erosion. This can be avoided by using die material of highly resistant to the temperature of molten metal.

Related Questions

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? 
Assertion (A): Aluminium alloys are cast in a hot chamber die casting machine. Reason (R): Aluminium alloys require high melting when compared to zinc alloys.
A 250 mm by 250 mm ingot casting, 1.5 m high and at 1225 K temperature, is stripped from its mold. The casting is made to stand on end on the floor of a large foundry whose wall, floor and roof can be assumed to be at 300 K temperature. Make calculation for the rate of radiant heat interchange between the casting and the room. The casting material has an emissivity of 0.85
The melting temperature of non-ferrous alloys, to be casted in a cold chamber die casting machine are of?
From the given table, what is the percentage of students scoring 40 or more, but less than 70. Scores Less than 20 Less than 30 Less than 40 Less than 50 Less than 60 Less than 70 Less than 80 No. of Students 12 19 22 31 38 46 50
Which row of the following table correctly matches the terms with the respective processes of state-change?   Change of State   Gas to liquid Liquid to solid Solid to liquid 1. Condensation Melting Solidification 2. Condensation Solidification Melting 3. Evaporation Melting Solidification 4. Evaporation Solidification Melting
In vacuum die casting, the melt enters into the mould cavity with less speed than that in the die casting technique.
The die has longer life for casting of materials but less for aluminium alloys.
Low melting point alloys can be cast in the cold chamber pressure die casting.
Casting of non-ferrous alloys by continuous casting method can cause an explosion if the casting contacts with water during processes.