Gravity die casting is refers to the process that the liquid metal pured into the casting with the earth gravity, it is also known as gravity casting. Gravity Casting is named permanent mold casting or chill casting. It is called permanent mold in America, and is named Chill cast or gravity casting in Europe.
This process is suitable for less quantity and high quality aluminum casting, the surface is better than sand casting. The material of mold is steel, the mold is pre-heated up to 200℃ before the aluminum alloy is poured into the cavity.
The weight range from 30g to 100kg/pcs, all thickness of parts must meet above 3.5mm, the draft angles must meet 1º to 3º on outside surface, 2º to 5º on inside surface.
However the gravity casting also has some disadvantages. Metal mold is not cheap because of that heat resistant alloy steel and on its top are relatively expensive. Certainly the overall costs are much cheaper than die casting mold. Each product cost is obviously too high for small batch production, it is not easy to be accepted. Gravity casting is limited by mold material, processing equipment and cavity machining equipment. So it is incapable of action for large castings.
Post time: Dec-10-2019