Knowledge from the world of porous plastics and filters.

During sintering, grainy or powdery base material is mixed and fused or compressed by means of heating. However, in contrast to a pure smelt, no or at least not all source materials are melted on. In layman’s terms, the source materials are ‘baked’.

The strength of the sintered bodies is based on sintering necks formed in a later production stage that are created as a result of surface diffusion between the material particles.

In some cases, workpieces are calibrated after the last stage, e.g. If higher dimensional accuracy is required that cannot be reached simply by sintering due to the fact that the volume loss cannot be calculated precisely. Here, the workpiece that is practically finished is tempered again.

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General construction rules for the construction of sintered plastic moulds:

  • Boreholes and undercutting vertical to the pressing direction can only be realised in a reworking phase.
  • Boreholes should have a minimum diameter of 2 mm.
  • It is better not to choose an overly extreme ‘slenderness ratio’ depending on the height of the workpiece. Several parts can be joined on a case-by-case basis.
  • If the outer edges need to be rounded, it is recommended that these are created as chamfers (30° – 45°) with levelled-off inclinations.
  • Usually, parts with one or several mould separators require more tool and/or production effort. The part thickness should not undercut 1.5 mm.

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