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What’s the Difference Between Hot Chamber Die Casting and Cold Chamber Die Casting?

If you are in the manufacturing industry and need to make parts that are not sensitive to high temperature, cold-chamber die casting is a good option. It produces castings with a smooth finish and thin falls. The difference between the two processes lies in how they melt metal.

Hot chamber die casting has a furnace within the machine, while cold chamber die casting introduces the molten metal from outside the machine. While both processes produce similar end products, they have different scopes of application. Cold-chamber die casting deals with metal alloys with a low melting point and hot-chamber die casting handles high-temperature metals.

Hot chamber die casting incorporates a reservoir to hold the metal melt, while cold chamber die casting prepares the metal melt in a separate furnace. The shot is then transferred to the die cavity via an automated ladle. Once cooled, the metal solidifies and the die is ready to be used.

Cold chamber die casting is a much faster method. It allows the production of higher density parts and has lower cycle times. However, it has several drawbacks, such as the tendency for the metal to cool too quickly. The choice between these two methods should be based on your project and your manufacturing partner.

The primary differences between Hot Chamber Die Casting and Cold Chamber Diecasting are the fluidity of the metal and the rate of heat transfer. This affects the injection pressure and how easily the metal fills the mold cavities. Additionally, the dimensional change of the metal will impact the product’s dimensions. Moreover, the size of the production runs will affect the cost-effectiveness of the method.


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In contrast to Cold Chamber Die Casting, Hot Chamber Die Casting is a more efficient method for casting parts that are not too soft. It is suitable for magnesium, aluminum, and zinc alloy parts. However, the production volume of Hot Chamber Die Casting is smaller.

Both Hot Chamber Die Casting and Cold Chamber Diecasting share some similarities. Both processes use molds to cast complex non-ferrous metal parts. Both methods use reusable dies. Each process has four main steps that form the foundation for a die casting run. The first step involves injecting molten metal into the mold cavity. After it solidifies, the casting is then removed from the mold and finished with grinding.

Hot Chamber Die Casting is a good option for metals with low melting temperatures. This method can produce parts with high precision and long life. However, hot chamber die casting is restricted to non-ferrous metals. Cold chamber die casting is a better option for metals with high melting temperatures.

Hot Chamber Die Casting reduces oxygen and magnesium contact, reducing the formation of flames and oxides. Hot chamber die casting also seals the molten metal inside the crucible, which prevents it from escaping. Although SF6 is a toxic chemical, alternative melt protection technologies are available.

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