Pressure die casting

What are the Advantages of Gravity and Pressure Die Casting?

If you are interested in aluminium die casting, then you are faced with the choice between gravity die casting and pressure die casting. Both of these distinct die casting methods are available from Lupton & Place, and are best suited to different applications – as they each have their own advantages and disadvantages.

Gravity Die Casting

In contrast to pressure die casting, which requires high pressure injection of molten metal, and all the complex and expensive machinery which comes along with it, gravity die casting is a simple matter of pouring the molten metal vertically down into the mould. Perfect for inexpensive casts and simpler set-ups, gravity die casting is still able to produce identical components with a high degree of reliability and accuracy in short periods of time.

In addition, gravity die casting is better for components which will later have to undergo heat treating, or in situations requiring a sand core, which is much more difficult (and often impossible) at the higher pressures required for pressure die casting. Thanks to the slower speeds involved in the introduction of metal during gravity casting, it is less common for the metal to fold over on itself or trap bubbles within the mold, so the likelihood of a mistake or error is lower – however, gravity die casting is relatively imprecise when compared to pressure die casting, and is less able to create thin-walled structures. For particularly complex, narrow components, pressure die casting may be more suitable.

Pressure Die Casting

Highly accurate, pressure die casting uses automated injection equipment to quickly fill the hardened steel dies with metal, removing human error from the equation and minimising spillage. Thanks to this automated, production-line accuracy, pressure die casting is very fast, and able to create very large volumes of castings in short amounts of time, at relatively low cost per component. Once the dies have been machined to shape, the rest of the process is a fast-paced, automated production cycle – as a result, a large proportion of the cost of pressure die casting is in the set-up, making it perfect for long production runs or large volumes of goods.

With those advantages, it is clear that pressure die casting is well-suited to mass production. Relatively inflexible when compared to gravity die casting, the process is expensive to set up but inexpensive over the long run, making it perfect for creating large volumes of identical components but less well-suited to limited production runs or individual casting, which become proportionately more expensive the fewer of them there are.

If you still aren’t sure which die casting method would suit your needs more effectively, get in touch with the experts at Lupton & Place on 01282 422361 or use the contact form below – with decades of experience in their field, the die casting specialists at our head office will be able to provide any information and advice you might need to find the best die casting solution for your requirements!

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