What is the difference between die casting and casting

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What is the difference between die casting and casting?

Die casting is a specialized type of casting that uses high pressure to force molten metal into a reusable steel mold (die), enabling high-speed production of complex, precise parts with smooth surfaces. Traditional casting (like sand casting or investment casting) typically relies on gravity or low pressure to fill disposable molds (e.g., sand, ceramic), making it more versatile for larger, simpler shapes but with slower production and rougher finishes. Die casting suits mass-produced metal parts (e.g., automotive components), while general casting covers broader applications.

1. The definitions of die casting and casting are different:

Die casting is a metal casting process characterized by applying high pressure to the molten metal in the inner cavity of the mold. The mold is usually made of a higher strength alloy. This process is somewhat similar to injection molding.

Casting is a method of pouring liquid metal into a casting cavity that is adapted to the shape of the part, and waiting for it to cool and solidify to obtain parts or blanks.

Die casting process

2. The processes of die casting and casting are different:

The essence of pressure casting (referred to as die casting) is to fill the die casting mold cavity with liquid or semi-liquid metal at a high speed under high pressure, and to form and solidify under pressure to obtain castings.

The casting process can be divided into three basic parts, namely casting metal preparation, casting mold preparation and casting processing. Casting metal refers to the metal material used for casting castings in casting production. It is an alloy composed of a metal element as the main component and other metals or non-metallic elements. It is usually called a casting alloy, mainly cast iron, cast steel and cast non-ferrous alloys.

What is Precision Casting

3. The casting precision of die casting and casting is different

Die casting is a precision casting method. The dimensional tolerance of die castings cast by die casting is very small and the surface precision is very high. In most cases, die castings can be assembled and applied without turning, and threaded parts can also be cast directly.

Casting, melting metal, making castings, and pouring molten metal into the castings. After solidification, a metal part blank with a certain shape, size and performance is obtained.