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Special casting has the characteristics of high precision, good mechanical properties, high productivity and good working conditions.

Special casting methods are as follows:

(1) Metal mold casting: the method of injecting liquid metal into a mold made of metal to obtain a casting.

Features: One mold multi-casting, high casting accuracy, good mechanical properties, but high cost, mainly used for mass production of copper, aluminum, magnesium and other non-ferrous alloy castings.

(2) Investment casting: a casting method in which wax is made into a pattern, coated with several layers of refractory paint, and heated to make the pattern melt, flow out, and bake into a pattern with a certain strength, then poured and removed.

Process features: take the melting pattern as the starting mode. The precision of casting is high, and it is a method of little cutting. Its equipment is simple and production quantity is not restricted. It is mainly used for mass production and mass production. The drawback is that the process is complex and the production cycle is long.

(3) Pressure casting: a casting process in which molten metal is rapidly pressed into the cavity of a metal mold under high pressure and solidified under pressure to obtain a casting.

Process features: high speed and high pressure is applied on the basis of metal mold casting to improve metal fluidity. It is mostly used for mass production of precision casting of non-ferrous alloys, such as aluminum, copper and magnesium.

(4) Centrifugal casting: a casting method in which molten metal is poured into a high-speed rotating mold to solidify the liquid metal under the action of centrifugal force.

Process features: compact structure, good casting quality. It is used to produce hollow castings.

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