What Is Sand Casting And Its Process

What is Sand Casting?

Sand casting is a metal casting process that uses sand to create the mold in which the metal is poured. 

It is the most common casting process, accounting for over 80% of all castings produced.

Sand properties

Sand is a versatile material that can be used to create a variety of shapes and sizes of molds.

It is also relatively inexpensive, which makes it a cost-effective casting process.

The properties of sand that are important for sand casting include:

Permeability: The sand must be able to allow air and gases to escape during the casting process.

Flowability: The sand must be able to flow easily into the mold cavity.

Reusability: The sand must be able to be reused multiple times to reduce costs.

Strength: The sand must be strong enough to support the weight of the molten metal.

How to make a sand-casting

Sand casting can be done following these steps:

1. Pattern Making: 

Create a pattern using materials like wood or metal that represents the desired shape of the casting.

2. Mold Box Preparation:

Make a mold box that will hold the sand and create the casting cavity.

3. Sand Filling: 

Fill the mold box with appropriate sand. The sand is used to create the shape of the casting.

4. Pattern Placement: 

Insert the pattern into the sand. The pattern will leave an impression in the sand, forming the shape of the casting.

5. Sand Compaction: 

Compact the sand around the pattern to ensure the accurate shape of the casting.

6. Core Placement (Optional): 

For castings with internal structures, use additional patterns called cores to create the internal shape within the sand mold.

7. Casting the Metal: 

Melt the desired metal and pour it into the mold box. The sand and pattern are designed to withstand the heat of the molten metal.

8. Cooling: 

Allow the casting to cool sufficiently. During this stage, the metal solidifies and the casting retains its shape.

9. Sand Removal: 

Remove the sand surrounding the casting. This involves separating the sand from the mold and extracting the casting.

10. Finishing: 

Perform necessary post-processing on the casting. 

This includes cleaning the surface of the casting and conducting any required machining or finishing operations.

By following these steps, you can successfully create a sand casting. 

It's important to prioritize safety by wearing appropriate protective 

gear and being aware of potential hazards during the casting process.

Sand casting processes

There are many different sand casting processes, each with its advantages and disadvantages. 

Some of the most common sand-casting processes include:

Green sand casting:

This is the most basic type of sand casting. The sand is mixed with water and then packed around the pattern.

Dry sand casting:

This process uses sand that has been dried before it is packed around the pattern. 

This results in a stronger mold that can withstand higher temperatures.

Investment Casting: 

This process uses a wax pattern that is melted out of the mold after the metal has solidified. 

This results in a very smooth and accurate casting.

Sand casting is a versatile and cost-effective casting process that can be used to produce a wide variety of castings. 

It is a good choice for castings that are relatively simple in shape and size.

saivs

SAIVS is a leading Sand casting foundry in China of top-quality Investment Casting committed to delivering excellent quality, 

superior value, and exceptional customer experience. SAIVS has the experience, technical expertise, and quality assurance processes

to consistently and reliably deliver an extensive range of precision castings with further processing.