Die Casting vs Sand Casting

Die casting is the metal type pressure casting on the die-casting machine, which is the most efficient casting process. The die casting machine is divided into two types: hot chamber die casting machine and cold chamber die casting machine.

Hot chamber die casting machine has high degree of automation, less material loss, higher production efficiency than cold chamber die casting machine, but it is restricted by the heat resistance of the machine, and it can only be used for casting production of low melting point materials, such as zinc alloy die casting and magnesium alloy die casting. Today's widely used aluminum alloy, due to the high melting point, can only be made on the cold chamber press.

The main feature of diecast is that the metal liquid fills the filling cavity at high pressure and high speed, and forms and solidifies under high pressure. The disadvantage of the die casting is that because the metal liquid fills the cavity at high pressure, high speed, the air in the cavity is inevitably trapped inside the die casting process, creating a subcutaneous stoma, as a result the aluminum alloy die casting is not suitable for heat treatment.

Sand casting is a traditional casting process with sand as the main molding material. Commonly used sand mould gravity casting, when have special requirements, also can use low pressure casting, centrifugal casting, etc. The adaptability of sand casting is very broad, small piece, large piece, simple piece, complex piece, single piece and large number can be adopted.

Molds for sand casting, previously made of multipurpose wood, are commonly referred to as wood molds. But wood model is easy to deform and easy to be damaged. Sand mold casting also has some disadvantages: because each sand casting mold can only be casted once, the mold after casting is damaged, and then must be re-shaped, the production efficiency is low; Because the whole property of sand is soft and porous, the casting size precision of sand casting is low and the surface is rough.

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