Pressure die casting

How Do Pressure Die Casting and Gravity Diecasting Differ?

When it comes to making components that are both high in strength and high in integrity, diecasting is the ideal process. Two distinct types of diecasting we specialise in here at Lupton & Place are pressure die casting and gravity die casting. But what are the differences between these two die casting processes? Below we explain the qualities of both types of diecasting and the similarities between them.

Pressure Die Casting

Pressure die casting is a quick and dependable process used to consistently produce identical metallic components with a high level of accuracy. In this process, complex machinery is used to inject molten metal or alloys – under high pressure – into a hardened steel die. These components are then applied to industries and sectors such as the automotive industry, hardware industry and general kitchen sections.

One notable difference between pressure die casting and its gravitational counterpart is that in pressure die casting, the injection of the metal into the die is automated. This gives it the benefit of being able to produce components at extremely high rates at a relatively low cost, with minimal metal loss due to spillage. Components manufactured using pressure diecasting are also dimensionally accurate and often boast a very smooth surface finish.

The above positive qualities to pressure die casting tend to be considered a worthwhile trade-off for the process’ comparative lack of flexibility in design, with pressure die casting best at producing stable computer-aided designs in high volume. The automated nature of pressure diecasting often also requires complex internal water cooling which can be expensive. The parts required for this type of die casting also tend to be lower than parts required for gravity die casting, making them more affordable therefore obtainable.

Components produced through the use of pressure diecasting are suitable for low temperature metals and alloys such as aluminium and copper, with aluminium die casting increasingly being used by the car industry as we explored in our last blog.

Gravity Die Casting

Gravity die casting is a similar process to pressure die casting, except instead of the molten metal being injected into the die – which requires additional force – the metal is poured in from a vertical position.

One advantage of gravity die casting is that the process requires far simpler tools, making it a far cheaper and less time-consuming operation. The high-speed production of gravity die casting parts is down to the die machining providing space for hundreds of parts to be created within the space of a day or so. It also avoids a range of issues, such as trapped gas within the mould, or the possibility of the metal folding over itself when introduced to a mould too quickly, both of which potentially affecting the integrity of the cast.

The relative imprecision of gravity die casting means that it is best suited for producing larger, thicker parts compared to pressure die casting, or in lower volumes where final designs may still be subject to change. It is also superior in situations where heat treatment is necessary, or for more complex designs using sand cores as you will find that you have more flexibility during the initial process.

Want to Know More?

It should be obvious from the points above that gravity die casting and pressure die casting have their own distinct advantages, depending on your individual requirements. If you would like to know more about which process would be best for you, or about any of the other services we offer here at Lupton & Place, why not give us a call today on 01282 422361 or get in touch via our online enquiry form? We look forward to being at your service.

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