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The method by which molten metal is forced or injected at high pressure into a metal mold is what is called die casting. When this metal solidifies, the mold is opened, and the metal piece is extracted. Cold chamber die casting is one of the methods of die casting.

cold chamber die casting

What is cold chamber die casting?

In cold chamber die casting, the metal (which has already been melted externally) is poured into a cylindrical sleeve or cold chamber. The cold chamber port is sealed, and the metal is injected into the mold cavity.

Basically, all that is needed for the cold chamber die casting are a ladle for the molten metal to be poured in and an outside furnace.

This process is a preferred manufacturing method for alloys with high melting points. These include zinc alloys, aluminum alloys, copper, and brass. The cold chamber die casting methods are known to produce denser metal castings from these alloys.

What are the advantages of cold chamber die casting?

  •  Produces dimensionally stable parts:

The cold chamber die casting method of die casting produces parts that have dimensional accuracy and have stability while at the same time, they are tolerant and heat resistant.

  • Produces stronger and lighter parts:

Plastic injection moldings with the exact dimensions are less intense than cold chamber die casting parts. These ones are lighter and stronger than those made with other casting methods. Again, the alloy rather than the joining process contains the strength since die castings do not include separate parts welded together.

  •  Produces in high speed:

In comparison to other die casting methods, the cold chamber die casting method produces complex shapes in closer tolerances. Although little machining is needed, many (as in thousands of) identical castings can be created before it becomes necessary to add more tools.

  • Produces denser metal castings:

This is the significant advantage of the cold chamber die casting method. Because of the higher pressure applied during the injection process, denser metal is produced. This density can also be associated with the higher speed process of the cold chamber injection.

  • Produces effectively:

This is the most effective die-cast method. This is because it can produce, in mass, a range of components and shapes, unlike other methods. Not only that. These parts are also long-lasting.

  • Low maintenance cost:

If this doesn't give it an edge over all other methods, what can? The cold chamber die casting allows manufacturers to produce more parts at lower costs. So we can say with this process, less is more!

  • Produces multiple finishing techniques:

We can say that this is a dynamic die cast process. Do you need smooth surfaces? Textured surfaces finishes? Or do you need the parts to be finished with minimum surface preparation? The cold chamber die casting method can produce all of these finishes.

What are the disadvantages of the cold die casting method?

The cold chamber die casting method is well recommended, and although its advantages outweigh its disadvantages, it has disadvantages all the same. These are:

  •  High level of oxidation:

The cold chamber die casting method involves a high oxidation level. This causes the molten material to be exposed to contaminants during the process and ends up disturbing the quality of the product.

  • The production cycle is long:

Unlike the hot chamber die casting, this process is quite long. This is because the molten metal in the separate chamber has to cool down before the injection process can happen. This additional step is not used in hot chamber die casting.

What are the other methods of die casting?

It would be unfair if we talk only about the cold chamber die casting method and forget the other form, which is the hot chamber die casting method, wouldn't it? I think it will be. So what then is the hot chamber die casting method, and what are their differences?

It is pretty simple. The machine used in the hot chamber die casting process has the metal melting pot as an integral part of it and to inject the metal from the pot into the die, a goose-neck is used. It is also called the gooseneck machine.

When the port is closed, the metal stays in the cavity to solidify. After cooling and solidifying, the plunger retracts, and once the die opens, the casting can be removed. This makes the hot chamber method a continuous one.

Also, this method is used for materials with lower melting points. This is because, unlike the cold chamber die casting that uses an outdoor furnace, the melting pot for this is internal. Materials used are those that won't dissolve the metal of the machine when out under high pressure. Such materials include lead, zinc and magnesium alloys.

This process is relatively fast. The typical cycle lasts fifteen to twenty minutes. So would you say this is a better process?

How do you make a choice?

Before selecting a method for die casting, you have to go through the qualities of both methods and decide which favors you.

The first step is to consider the parts and materials you want to use. So far, the materials used for each process have been mentioned. So, what materials are you making use of? The answer you give here should already tell what process you should go for.

The next thing to do is to consider the quantity that you want to produce and within what timeframe. This will definitely lower the cost of production.

After considering all these, the next question you may ask yourself is where you can get production parts for cold chamber die casting. Don't look too far; here at Best Precision Technology, we have all of these parts.

Remember, your customers need efficient, advanced, and highly marked machines, and they also need quality products. Fortunately, we have these machine-made parts at Best Precision Technology.

Don not hesitate, to visit our website here at now!

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