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CEM process

Home Processes CEM process

Composite Extrusion Modeling

Composite extrusion modelling (CEM process) combines the metal injection moulding process (MIM process), which is already established worldwide, with the process technologies from additive manufacturing.

The basic features are oriented towards fused deposition modelling (FDM) as well as selective laser melting (SLM) and create an optimal fusion of conventional production with innovative additive manufacturing.

The result is a very simple process that is based on cost-effective and easily available injection moulding pellets and offers the freedom of additive manufacturing without moulds. The CEM process not only reduces material costs significantly, but also machine costs can be drastically reduced. Already known problems in metal production, such as residual stresses, are significantly reduced in the CEM process.

In the CEM process, only the plastic component of the MIM pellets is melted. The metal powder bound by the plastic forms a so-called green part, which is still quite fragile.

sintering

In the next stage of the process, the plastic is first debinded, that means the binder is chemically or thermally dissolved. Finally, the temperature is raised in a sintering furnace to just below the melting point of the metal. The metal particles bond on a molecular level and form a stable metal part.

Due to the process, the sintered part shrinks. This shrinkage is largely homogeneous in all three spatial directions and depends on the printing material. The sintering shrinkage can be taken into account by a simple scaling of the printing geometry.

sinter shrinking

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