Die casting fundamentals — in pressure die casting, is the statement “the molten metal is forced into the mould cavity under high pressure” correct?

Introduction / Context:
Die casting is a high-production process for non-ferrous alloys such as aluminium, zinc, and magnesium. A key distinguishing feature is the application of high pressure to drive molten metal into steel dies, leading to fine detail, excellent surface finish, and tight dimensional control.

Given Data / Assumptions:

• Pressure is applied by a plunger (hot-chamber or cold-chamber machines).
• Permanent metal moulds (dies) are used rather than expendable sand moulds.
• High injection and intensification pressures are typical during filling and solidification.

Concept / Approach:

The essence of pressure die casting is forcing molten metal into a closed die at pressures that can range from several MPa to tens of MPa. This pressure reduces porosity, produces rapid filling of thin sections, and improves surface finish. The question directly restates this defining attribute.

Step-by-Step Solution:

Verification / Alternative check:

Comparative processes such as gravity die casting rely on gravity, not pressure, confirming that pressure die casting is distinct because of the applied high pressure.

Why Other Options Are Wrong:

“Incorrect” would contradict the formal definition of pressure die casting.

Common Pitfalls:

Confusing gravity die casting with pressure die casting; assuming all die processes are pressure-assisted when gravity versions exist.

Final Answer:

Correct