How Die Casting Works: The 5-Step Process

Preparation: The two halves of the steel die are cleaned and sprayed with a lubricant. This helps regulate the temperature and ensures the finished part can be easily ejected.

Injection: The die is clamped shut with massive force. Molten metal is then injected into the die cavity at high pressure (ranging from 1,500 to 25,000 psi).

Cooling: The metal remains in the die until it solidifies. Modern dies often have internal water channels to speed up this cooling phase.

Ejection: The die opens, and ejector pins push the solid part out of the cavity.

Trimming: Excess metal (called "flash") that seeped into the parting lines or gating system is trimmed away, often using a dedicated trim die.