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|1. (WO2018024755) APPARATUS FOR THE ADDITIVE MANUFACTURING OF A THREE-DIMENSIONAL BODY IN A POWDER BED|
|Applicants:||FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V.
TECHNISCHE UNIVERSITÄT DRESDEN
|Title:||APPARATUS FOR THE ADDITIVE MANUFACTURING OF A THREE-DIMENSIONAL BODY IN A POWDER BED|
The invention relates to an apparatus for the additive manufacturing of a three-dimensional body in a powder bed, said apparatus comprising a manufacturing region having a lowerable surface on which the powder bed is located, and at least one doctor blade for transporting and evenly distributing a powdered material over the surface. The at least one doctor blade can be moved about a rotational axis which is perpendicular to the surface of the powder bed, and the length of the doctor blade corresponds to at least the greatest distance between the rotational axis and the edge of the manufacturing region. Nozzles are designed on the at least one doctor blade in order to apply the powdered material to the surface of the powder bed. The following are also located on the apparatus: a device for feeding the powdered material into the at least one doctor blade and to the nozzles; a device for rotating the at least one doctor blade over the surface of the powder bed; and a device with which at least one energy beam is directed onto the surface of the powder bed, the focal spot of the energy beam being movable in two dimensions.