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Electron Beam Melting (EBM)
What is Electron Beam Melting?
An Electron Beam Melting machine uses as electron beam to selectively melt powdered material onto a powder bed. The platform lowers by the defined layer height and a new layer of powder is deposited on top of the part for the process to start again. The Electron Beam then melts the new powder layer and it is fused to the previous layer to create a 3D object and the process is repeated until the parts are created.
DMLS requires additional support structures to be constructed and the part is anchored onto a build plate, this transfers the build up of heat due to the high temperatures involved in the process and reduces thermal stress to mitigate warping of the part. The part is removed from the plate via a post process, usually an EDM machine.
Parts can be manufactured close together and even inside each other to maximise the total build volume. The metal is manufactured inside a vacuum environment.
- High density (99%)
- Good mechanical properties of parts
- Less thermal stress than DMLS therefore less support structures required
- Very expensive system costs
- Limited metal material range
- Slow build time
- Small build volumes
- Poor surface finish compared to DMLS
- Limited tolerance
- Post processing required