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Gravity Casting | What Are Sand Castings?

Sand casting is a form of gravity casting where sand is used as the mold material. A sand casting is a relatively inexpensive casting process and can be used for producing either large or small parts.

How Sand Castings Are Made

The first step in the sand casting process is to create the mold itself. The sand mold is formed by packing sand into the mold. When the mold is removed, what remains is the cavity that will form the casting.

After the mold has been made, it is prepped for the molten metal to be poured. The surface of the cavity is lubricated to help in the removal of the casting. The mold halves are closed and securely clamped together.

Once the mold is securely clamped, the molten metal can be poured. The pouring can either be done manually by using a ladle or by a machine. Enough metal must be poured to fill the entire cavity.

As soon as the molten metal is poured into the mold it will begin to cool and harden almost immediately. One the entire cavity has been filled and hardened, the final casting is formed. Once that happens, the sand mold can be broken and the casting can be removed. The process, called shakeout, is usually performed by a vibrating machine that shakes the sand and casting out.

The final step is trimming. During the cooling process, the material will solidify and attach to the part. The excess material must be trimmed.

Are You in Need Of Gravity Casting?

We offer a wide variety of casting methods. Contact us today to learn more about what we offer.

Who does gravity casting?

Gravity Casting | Gravity Casting Process

Gravity casting is a casting process used for non-ferrous alloy parts. Sometimes referred to as Permanent Mould, the process is typically used on aluminum, zinc, and copper base alloys. Let’s take a deeper look at the process and some of its benefits.

The Process

There are three stages to the gravity casting process.

The first step is the heating of the mold and coating it with a die release agent. The release agent spray also serves as a cooling agent after the part has been removed from the die.

In the second step, the molten metal is poured into channels in the tool to allow the material to fill the entire mold cavity. The metal is either dosed or hand poured by using ladles. Usually, there is a mold “down sprue” that allows the alloy to enter the mold cavity from the lower part of the die. This reduces the formation of turbulence and subsequent porosity and inclusions in the finished part.

After the part has cooled, the die is opened by either using a mechanical tool or manually.

Advantages

There are many advantages to gravity casting. It offers good dimensional accuracy, a smoother cast surface finish than sand casting, and improved mechanical properties compared to sand casting. Gravity casting also provides faster production times compared to the other processes.

Does Your Project Require Gravity Casting?

Gravity casting is ideal when using non-ferrous alloy parts such as aluminum and zinc. Contact us today to learn more about this, as well as the other services we provide.

What is gravity casting?