Sand Casting VS Die Casting

Die casting and Sand casting are two different casting processes, and they are also relatively common casting methods in MINDWELL. You can choose the required casting method according to the shape, size, and precision of the desired parts. Die casting and Sand casting are both applicable. Depending on the scope and advantages and disadvantages, which method to choose depends on the specific situation.

The difference between die casting and sand casting

Both casting methods have their own advantages. Let's take a look at the specific differences between the two casting methods:

raw material

• Die casting usually uses low melting point alloys such as aluminum alloys, zinc alloys, and magnesium alloys as raw materials. These alloys have good castability and mechanical properties and can be melted at relatively low temperatures and quickly flow into the mold cavity to form a fine casting structure. The melting points of aluminum alloys, zinc alloys, and magnesium alloys are around 660°C, 419°C, and 648°C, respectively. Lower melting points help reduce casting energy consumption and processing difficulty.
• Sand casting usually uses high melting point alloys such as cast iron, cast steel, and brass as raw materials. These alloys have high strength, hardness, and wear resistance, and are suitable for making large and complex castings and components. The melting points of cast iron and cast steel are around 1100°C and 1430°C respectively, and the melting point of brass is above 900°C, which requires higher casting temperature and energy consumption.

Cost and speed:

Die casting

• Die casting is a process that creates complex parts by injecting molten metal into molds. This process requires additional molds and equipment to achieve, so the cost is higher. However, as the manufacturing and investment costs of the tooling can be spread over the mass-produced parts, the costs decrease over time as production volumes increase.
• In mass production, die casting can realize high-speed production and high-precision complex parts processing. Because each mold can typically produce thousands or even hundreds of thousands of parts, it is only necessary to make the mold once for mass production. Also, the process is fast, often producing hundreds of parts per minute.

sand casting

• The cost of sand casting is lower because it does not require additional molds and equipment. Instead, it uses a mold that is shaped like the part to create the part. These molds can be made using low-cost materials, so the cost will be low. Also, even if a new mold needs to be made, it is much cheaper than die-casting molds.
• Sand casting is slower to produce and can only process simpler parts. The application of this process is limited in the production of high-precision and complex parts because the shape and size of the part limit the ability to use this process. In addition, sand casting requires more manpower because each mold can only produce one part, so it takes longer to manufacture a large number of parts.

Surface Quality

• Die casting uses high pressure to inject molten alloy into molds to produce parts with high precision and clear details, and the shape and size can be strictly controlled. It is highly productive, low-cost, and capable of producing parts of various shapes and sizes with smooth surfaces, attractive shapes, and no secondary operations. Not only that, but the parts made by die casting have high density and strength, which can be used to produce high-load parts.
• Sand casting uses molds to cast molten metal into shapes. Compared with die casting, sand casting requires a lot of manual labor, and problems such as inaccurate shapes and rough surfaces are prone to occur during the production process. Even if the mold model is good, there will be defects such as air holes, resulting in poor surface quality. Therefore, secondary processing, such as sanding, grinding, etc., is usually required to remove surface defects in order to meet the standard requirements. However, due to the low cost of manufacturing and equipment, sand casting is often used to manufacture large, complex, and irregular parts, such as machine accessories and engine casings.

application

Die casting

Die casting is suitable for the production of high-volume, high-precision, and complex-shaped parts

1. Auto parts: Many auto parts are produced by the die-casting process, such as engine covers, clutch housing, transmission system components, etc.
2. Electronic devices: The shells or heat sinks of many electronic products are also manufactured by die-casting processes, such as mobile phone shells, TV racks, computer heat sinks, etc.
3. Tools and equipment: explosive spray guns, machine parts, pneumatic tools, door handles, etc.

Sand casting

Sand casting is suitable for the production of small and medium batches of parts with relatively simple shapes

1. Agricultural machinery: Sand casting technology is often used in the manufacture of agricultural machinery, such as tractor parts, farming machinery parts, etc.
2. Boilers and pressure vessels: Sand casting processes are also used in the manufacture of boilers and pressure vessels, such as boiler tubes, nuclear reactor pressure vessels, etc.
3. Automobile wheels: The casting of automobile wheels also adopts a sand casting process.

In general, Die casting is suitable for small batch, large, and high-precision product production, while sand casting is suitable for large-volume, large, and low-precision product production.

Summarize

Die casting is suitable for producing high-volume, high-precision, and complex-shaped parts, while sand casting is suitable for producing small and medium-sized batches and relatively simple-shaped parts. Depending on the required production quantity, precision, and shape complexity, an appropriate method can be chosen to produce the desired part, resulting in a more efficient and cost-effective production process.