3D printing with sand: Fast, economical casting molds

3D printing systems by voxeljet create sand molds and cores for metal casting quickly and cost-effectively. To achieve this, silica sand is built up layer by layer until the desired part has been constructed. The layers of sand are selectively bonded using a binder, ensuring stability and flexural strength. This fast process is perfect for manufacturing prototypes or optimizing parts. Large formats up to 4 metres long, 2 metres wide and one metre high are also possible.

Sand in 3D printing: Several advantages

  • Fast and flexible: with 3D printing, tools and parts can be optimised quickly and prototypes can be created much more easily.
  • Economical production: complex sand molds and cores created using additive manufacturing. Expensive tool production is not necessary.
  • Geometrical freedom: Undercuts can be easily realized, resulting in more complex parts than with conventional methods.
  • High resolution print heads ensure particularly accurate sand molds and cores.
  • Easy to combine: 3D-printed sand cores can be combined with traditional molds.
  • Simple core removal: Thanks to the low binder content, the behavior during outgassing and core removal is comparable to traditional processes.

Functional properties of sand for 3D printing:

  • Excellent flexural strength and stability.
  • Ready-to-use molds: no pre-treatment required.
  • Environmentally friendly: depending on the configuration, unprinted sand is virtually 100% recyclable.
  • Common casting materials with comparable properties: Silica sand combined with Furan / Phenolic resin*.
  • Suitable for all standard alloys

*Our service centres offer molds and cores with Furan binders, our printing systems use Phenolic binders.

Contact us and order your component here

SAND TYPESFOR FURAN RESIN
Molding MaterialSilica sandCerabeads
Type GS 14 / GS 19 / GS 25Cerabeads
Medium grain size140 / 190 / 250 µm 200µm
Application Molds and cores with high surface requirements/ Cores with high gas permeability /Cores; highest gas permeabilityHigh thermal resistance, low thermal extension, good packaging, good strength and surface, alternative to Chromite, Kerphalite or Zircone
Layer thickness300 / 300/400 / 300 µm300 µm
TECHNICAL DATASAND MOLDS FURAN RESIN
Build platformup to 4,000 x 2,000 x 1,000 mm
Binder-typeCold hardening furan resin*
Loss on ignition ≤ 1.9 %**
Accuracy± 0,1 % (min. ± 1.5 * layer thickness)
Bending strengthFrom 220 N/cm2 (depending on sand /or binder used)

*Only available as 3D print service at the voxeljet Service Center 

**Depending on sand types

TECHNICAL DATA SAND MOLDS PHENOLIC RESIN
Build platformup to 1,000 x 600 x 500 mm
Binder-typePhenolic binder
Accuracy± 0,1 % (min. ± layer thickness)
Bending strength250-500 N/cm(depending on sand /or binder)
Recycling rateapprox. 100 % of the loose material

 

 

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