Investment casting applications

3D printing with polymer based materials is the ideal solution for the cost-effective and time-saving production of investment casting models. The models are created by the layered application of a particle material that is selectively bonded with a binder. As the particle material, PMMA (polymethyl methacrylate), an acrylic plastic with excellent burnout properties, is used. Complex components up to a length of 1,000 mm can thus be produced quickly and easily.

Advantages:

  • Cost-effective production of investment casting patterns: without the need for complex and expensive tool production.
  • Complex components: virtually no limit to geometry with a possible wall thickness of 0,6 mm.
  • True-to-detail models due to a print resolution of up to 600 dpi.
  • High dimensional stability: no danger of heat distortion - even with large 3D patterns.
  • Surface finishing: wax infiltration for smoother investment castings or epoxy resin for improved strength of display models.
  • Ideal burnout behaviour: No shell breakage in investment casting due to negative thermal expansion coefficients.
  • Environmentally friendly: almost 100% of loose, unprinted material is reusable.
PLASTIC
Base materialPMMA particle material (55 µm)PMMA particle material (85 µm)
Binder-typePolyPor B (PPB)PolyPor C  (PPC)
Tensile strength≥ 2.0 MPa≥ 2.0 MPa
Yield point1 %1 %
Burn-out temperature700 °C600 °C
Residual ash content< 0.01 weight %< 0.01 weight %
Especially suited forInvestment casting; design modelsInvestment casting
Advantagessharp edges; for highest accuracy and true-to-detail; reusable particle materialburns out very well
TECHNICAL DATAPLASTIC PARTS
Layer thickness     Standard 150 µm
Resolution x, yup to 600 dpi
Accuracy± 0.4 % (min. ± 0.3 mm)
SUITABLE FINISHING TREATMENTWaxEpoxy
Tensile strengthsee base materialup to 25 MPa
Softening temp.73 °C 80 °C
Burn-out temp.see base material   -
Characteristicssmooth liquid, resistant surfacesolid material, dyeable