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1. (WO2018177531) METHOD AND APPARATUS FOR FORMING A THREE-DIMENSIONAL ARTICLE

Pub. No.:    WO/2018/177531    International Application No.:    PCT/EP2017/057667
Publication Date: Fri Oct 05 01:59:59 CEST 2018 International Filing Date: Sat Apr 01 01:59:59 CEST 2017
IPC: B22F 3/105
B29C 64/205
Applicants: ARCAM AB
Inventors: LJUNGBLAD, Ulric
Title: METHOD AND APPARATUS FOR FORMING A THREE-DIMENSIONAL ARTICLE
Abstract:
An apparatus for forming a three-dimensional article through successive fusion of parts of a powder bed, which parts corresponds to successive cross sections of the three-dimensional article, said apparatus comprising: a powder distributor configured for evenly distributing a layer of powder on top of a work table provided inside a vacuum chamber; and an electron beam source emanating an electron beam configured for fusing the powder layer in selected locations corresponding to said cross section of the three-dimensional article, wherein: said powder distributor being an elongated rod provided movable at a predetermined distance above the powder bed and with its central axis in parallel with a top surface of said work table, wherein at least one sensor is provided on said powder distributor facing towards said electron beam source, a detector for detecting a signal sent out from said sensor when said sensor is interacting with said electron beam.