Low-pressure die casting

Low pressure - High quality
Low-pressure diecasting or low-pressure gravity diecasting enables the tailored production of large-volume aluminum cast parts in small batches. A semi-automated procedure, low-pressure diecasting is particularly superior to the familiar method of aluminum gravity diecasting for large, rotationally-symmetrical molded parts with complex geometries. G.W.P. AG manufactures aluminum alloy low-pressure diecast parts weighing up to 20 kg. G.W.P. delivers more than just high quality cast parts – If needed, we assemble the cast parts with production parts in additional steps to form ready-to-install assemblies.

As a specialist in low-pressure diecasting of small and medium-sized batches, G.W.P. can offer Low-pressure diecasting at very competitive prices. Low-cost molds for low-pressure diecast parts give our customers a decisive advantage.

Taken advantage of our experience with low-pressure gravity diecasting – Rely on G.W.P.!

Low-pressure die casting services:

  • Pieces weighing 500 to a maximum of 20,000 g
  • For large-volume rotationally symmetrical components (housing shells, compressor housings, etc.)
  • Suitable for small to medium-sized batch sizes
  • Maximum mounting surface: 1200 x 800 mm
  • Inserts of brass or steel are possible (threaded bushings, bearing bushings or bolts, etc.)
  • Experienced mold and die construction
  • Low-pressure foundry machines with modular casting cells

Everything from a single source:

The low pressure die casting method
In low-pressure diecasting, a permanent mold is first created by CNC milling or spark erosion from hot-work steel. G.W.P. manufactures the molds and any necessary mold cores based on the mold drawings of the customer. After And a successful sampling, the cast parts are produced in series. The molten aluminum is fed through a feed tube at a pressure of approximately 0.5 bar from below into the mold, and it fills the permanent mold over approximately 50 seconds. By precisely maintaining all casting parameters, G.W.P. achieves the required high process reliability.

Advantages of low-pressure gravity die casting:
The mold-filling properties of low-pressure diecasting make it suitable for thin-wall, large surface parts. Low-pressure diecasting produces a fine-grained, very dense structure with attractive mechanical properties due to the controlled, low turbulence form-filling process and the fast, oriented hardening of the aluminum melt in the metal permanent mold. This largely prevents porosity and shrink holes. Low-pressure diecast aluminum parts have a high dimensional accuracy and surface quality. Cast aluminum possesses good electrical conductivity and superior thermal conductivity which makes aluminum a desirable material in machine building, automobile construction, and the electronics industry. In addition, the fact that aluminum parts are up to two-thirds lighter than those of cast iron makes cast aluminum a desirable alternative. Undercuts and cavities in cast parts can be achieved by using core inserts. Low-pressure diecasting is generally suitable for 200 - 1,000 castings of large-volume parts, however batch sizes of 50 units are sometimes economical. For a few medium-size cast parts weighing up 6 kg, we recommend aluminum gravity diecasting. For thin-wall cast parts in series up to 50,000 units, diecasting is the more economical method.

Aluminum alloys for low-pressure die casting
We use all conventional international aluminum alloys for manufacturing. Here is a selection:

Aluminum alloys for low-pressure diecasting according to DIN EN 1706

Numerical alloy chemical alloy
EN AC-42100 AC-AlSi7Mg0,3
EN AC-43000 AC-AlSi10Mg(a)*
EN AC-43100 AC-AlSi10Mg(b)*
EN AC-43300 AC-AlSi9Mg
EN AC-44100 AC-AlSi12(b)
EN AC-48000 AC-AlSi12CuNiMg*
EN AC-51100 AC-AlMg3(a)

* very popular

To obtain a list of all possible alloys according to DIN EN 1706, ASTM (USA), JIS (Japan) or GB/T (China) with their chemical composition, go to Alloys for low-pressure diecasting (PDF).

Do you still have questions regarding tolerances, die construction or project organization for low-pressure gravity diecasting? Consult our FAQ list and talk with our engineers and technicians!


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Phone:  +49 3328.33066.0
Email:    info@gwp-ag.com

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