If you require a series of metal parts for a specific application, you’ll need to select the most suitable casting method to produce them. You may be aware of several die casting processes and sand casting manufacturing, but what’s the difference between the two? And which is best for your project?

Our experienced team explore everything you need to know about die casting and sand casting, helping you to decide which method you should invest in.

Keep reading to discover more!

What is die casting?

The die casting manufacturing process is the production of accurate metal components in large quantities – it involves injecting molten metal into a steel mould cavity under high pressure.

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In aluminium die casting (one of the most popular forms of die casting), the cavity or mould features two halves that are clamped together in the die casting machine. The molten metal fills the die cast mould, where it cools and hardens to form an exceptionally accurate and high-quality final product.

The castings created can be utilised across a wide array of industries and include:

Automotive components
Ultrasound equipment
Aerospace parts
Medical devices and tools
Construction components
and much more!

Advantages of the die casting process

Die casting has many significant benefits that make it a great option for several applications and needs:

Dimensional accuracy

The main advantage of die casting is the dimensional accuracy of the metal parts produced. Complex shapes and intricate designs are efficiently achieved thanks to the high-pressure injection of the liquid metal, which fills the mould cavity, replicating its form with precision.

Surface finish

Due to this process’s pressure and temperature control capabilities, and the surface textures of the steel moulds, you achieve a better surface finish compared to other casting processes, like sand casting. This is great for aesthetics as well as functionality and aerodynamics.

Repeatability

Each steel mould can be re-used throughout the entirety of a production run, meaning you gain uniform parts consistently with next to no casting defects, which is vital for functionality and appearance.

Fast casting times

The die casting process offers high-speed production times, with the average production cycle taking between 30 to 60 seconds.

Cost-effectiveness

This process is incredibly cost-effective, especially for high-volume production. This is because thousands of parts are produced rapidly, ultimately reducing manufacturing costs.

Cons of die casting

Whilst die casting has several advantages, there are a few considerations:

Upfront costs

Whilst the die-casting process is cost-effective in the long run, it’s more expensive upfront. The costs of the machinery involved and the creation of new dies/moulds are quite high in comparison to the initial costs of the sand casting process.

Slow lead times

As complex moulds need to be produced before production commences, it can take longer overall to receive the parts.

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What is sand casting?

Sand casting is also a type of manufacturing process used to create metal parts – the name sand casting comes from the use of compacted sand moulds, rather than steel ones.

These dies can be made from various sand types depending on budget – for example, green sand can be reused and save you money, however, this material has been known to break during the casting process.

To produce the cavity, sand is pressed into two plates to create the required shape, which creates two halves. Then, the plates are sealed together and molten metal is poured or ladled into the mould – this method of inserting the liquid metal is also known as gravity pouring. Once the metal has cooled, the casts are removed from the die.

The sand castings produced typically have good dimensional accuracy, although not to the level of injection die casting.

Typically, this method of manufacturing is used to produce the following, plus much more:

Pump housings
Valves
Engine blocks
Cylinder heads

Sand casting benefits

The pros of sand casting include:

More flexibility

Unlike die casting which is great for smaller and more intricate parts, sand castings can range in size, from small to large.

Quick start-up and lead time

Sand moulds can be made faster than steel dies if you already have the desired pattern at your disposal. On average, the lead time for sand casts is 1-2 weeks.

Low upfront costs

There’s a lower tooling cost when it comes to creating sand casting dies, meaning the money you pay upfront will be less than with die casting.

Disadvantages of sand casting

You’ll need to bear in mind the following cons of sand casting:

Poorer surface finishes

Sadly, with sand casting you can expect a coarser surface finish to your metal parts, impacting their appearance. This is due to the sand texture of the mould becoming imprinted onto the casting.

Less dimensionally accurate

As a result of several factors, including moisture content in the sand mould, sand casting doesn’t always offer the same dimensional accuracy as die casting.

Only cost-effective for low-volume production

As mentioned earlier, sand moulds aren’t great for continuous permanent mould casting due to their potential for breaking or collapsing. With this in mind, this production method is only really used for low-volume production.

Which is better for my project, die casting or sand casting?

Both die casting and sand casting are effective methods of producing metal parts, however, determining which option is best suited to your needs completely depends on your project.

If you’re working on a budget and are searching for low-volume production that doesn’t exceed 1000 parts, sand casting is your best choice due to its cost-effectiveness. Saying this, you’ll have to consider the surface finish of your components and whether this could be detrimental to your project.

Aluminium high-pressure die casting is the more attractive option for high-volume orders of smaller and more complex parts, such as components for medical devices. Whilst it’s more expensive initially, you gain a collection of consistent shapes with exceptional dimensional accuracy, which is essential for many applications.

Get in touch with Lupton and Place today

Here at Lupton and Place, we’re specialists in precision die casting. Our highly skilled manufacturers always go above and beyond to ensure our services meet customer expectations.

Not only this, but we’ll efficiently handle the delivery of complicated projects and ensure that quality requirements are complied with.

To discuss your needs directly or request a quote, please don’t hesitate to call our team on 01282 422361 today. Or if you’d prefer, you can get in touch online and we’ll get back to you.