Forcing molten metal under high pressure into a mould cavity describes which casting process?

• A. Die Casting
• B. Sand Casting
• C. Investment Casting
• D. Permanent Mould Casting

Answer: (A)

High-pressure injection into a mold distinguishes die casting. Molten metal is forced into a steel or iron mold under high pressure, using a die-casting machine. The rapid filling and solidification give parts with smooth surfaces, tight tolerances, and high production rates, making it ideal for nonferrous alloys like zinc, aluminum, and magnesium. This differs from sand casting, which pours metal into a sand mold by gravity; investment casting, which uses a ceramic shell around a wax pattern and isn’t driven by high-pressure injection; and permanent mold casting, which uses a reusable metal mold but typically fills by gravity or low pressure rather than the high-pressure injection used in die casting.