Do You Know The Process of Die Casting?

There are four steps in traditional die casting, also called high-pressure die casting. Die preparation, filling, ejection, and shakeout are also the basis for any of the die casting variations. The dies are prepared by spraying the mold cavity with lubricant. The lubricant both helps control the temperature of the die and it also helps removal of the casting. The dies are then closed and molten metal is injected into the dies under high pressure. When the mold cavity is filled, the pressure is sustained until the casting has solidified. Then the dies are opened and the shot is ejected by the ejector pins. Finally, the shakeout included separating the scrap, which includes the gate, runners, sprues and flash from the shot. This is done generally with a special trim die in a power press or hydraulic press. Other methods of shaking out include grinding and sawing. If gates are thin and easily broken, to tumble shots is a less labor intensive method. Separation of gates from finished parts must follow. This scrap is recycled by fusion.

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