Casting Methods — Identify the Process: Gravity Filling of a Metallic Mould When molten metal is poured by gravity into a reusable metallic mould (without external pressure), which casting method is being used?

Introduction / Context:
Understanding the differences among gravity permanent mould casting, pressure die casting, slush casting, and centrifugal casting helps in selecting the right process for production rate, surface finish, and mechanical properties.

Given Data / Assumptions:

• Mould is metallic and reusable (e.g., cast iron or steel mould).
• Filling occurs by gravity, not by high pressure or rotation.
• No skin-only removal step is implied.

Concept / Approach:
Permanent mould casting uses metal moulds and gravity to fill the cavity. Die casting uses high pressure (hot or cold chamber). Slush casting allows the skin to solidify and the core to be poured out to create hollow castings. Centrifugal casting relies on rotation to force metal against the mould walls.

Step-by-Step Solution:
Check mould type: metallic and reusable → permanent mould family.Check filling mechanism: gravity only → permanent mould casting (not die casting).Therefore, choose “permanent mould casting method”.

Verification / Alternative check:
Process charts classify gravity permanent mould separately from pressure die casting.

Why Other Options Are Wrong:
Die casting uses pressure injection.Slush casting is a variant for hollow skins, not general gravity filling for solids.Centrifugal casting requires rotation; not present here.Continuous casting is a different continuous process involving a water-cooled mold and withdrawal system.

Common Pitfalls:
Assuming any metal mould implies die casting; pressure application distinguishes die casting from gravity permanent mould.

Final Answer:
permanent mould casting method