What Happens During Cold Chamber Pressure Die Casting?

When it comes to die casting, different types of processes are used to produce parts. One such type is cold chamber pressure die casting, which is the focus of this post. This process uses a metal mold and molten metal to form the desired shape before cooling it with compressed air. Let’s explore this process.

Stages of Cold Chamber Pressure Die Casting

Cold chamber pressure die casting comprises three main stages: pre-mold filling, progressive cavity fill, and ingate feed. Each step involves several different operations to produce a part in the final shape. Here’s a quick overview of each stage, along with how each operation is accomplished during cold chamber pressure die casting.

Cold Chamber Pressure Die Casting
Cold Chamber Pressure Die Casting

Pre-Mold Filling

Metal mold filling takes place before the molten metal and compressed air are introduced into the mold cavity to ensure enough material for the final part. This stage also includes resin injection, which injects any desired resins into the mold cavity to be cooled and hardened by the cold chamber pressure die casting process.

Progressive Cavity Filling

At approximately 1200 degrees Fahrenheit, the heated molten metal is pushed into the mold cavity with a screw-type plunger. This creates a seal around the edges of the part that helps to prevent any leaks during cooling. The compressed air enters through the air inlet and exit ports, circulating throughout the mold cavity during this stage.

Ingate Feed

This is where the part begins to take shape as the ingates are filled with molten metal from each of the open sections called ‘gates’. Once sealed, these innate feed channels direct melted material into their respective gates. Once the ingates are filled and the gates have been closed, the molten metal fills the mold cavity.

After that, no more air is pumped into the mold cavity. The rest of the process depends on what type of part you want to produce and other factors like size and material.

For example, a more significant part will require more time to cool, which slows down the filling process. Therefore, for the part to reach a solid state at a specific temperature, cold chamber pressure die casting must start and finish faster.

This is accomplished by changing the material used, increasing or decreasing air pressure, and adjusting other factors like resin injection speed. Hence, all of these different parameters come together to form the part.

Cold Chamber Pressure Die Casting Process
Cold Chamber Pressure Die Casting Process

Types of Parts Produced with Cold Chamber Pressure Die Casting

Many different parts can be produced using this process, which is primarily dependent on whether or not you want a single-cavity or multi-cavity mold and the size of each cavity. Multi-cavity molds make it possible to enter several different gates simultaneously, which allows for the more complex shapes needed in some applications.

Parts produced with cold chamber pressure die casting include car, motorcycle, and aerospace components like structural brackets and bearing mounts. This process can be performed on various metals such as aluminum, copper, zinc, and magnesium.

Although the process is primarily utilized to produce metal parts, it can also be used with non-metals like ceramics and plastics. However, this requires an extraordinary cold chamber pressure die casting machine that maintains the correct temperature for the material’s molten state. Plastic or ceramic molds are used together with inert gas and vacuum to eliminate the need for a metal mold.

Some other types of materials that can be used with cold chamber pressure die casting include glass, rubber, steel, iron, sulfur, and molds made from wood and plaster. These allow you to use this process when producing large or oddly shaped parts with hollow cavities like machine gun stocks and hulls for sporting goods like a canoe.

Take Away from Cold Chamber Die Casting

Cold chamber die casting is a powerful manufacturing technique that can produce high-quality, durable parts. You and your team of engineers need to understand how this process works so that you can make informed decisions about the types of products best suited for cold chamber die casting.

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