FUSING ONE OR MORE CROSS SECTIONS BY ELECTRON BEAM POWDER BED FUSION

    公开(公告)号:EP4008455A1

    公开(公告)日:2022-06-08

    申请号:EP20211402.1

    申请日:2020-12-03

    摘要: In summary the invention concerns a method for fusing one or more cross sections (C1, C2) in a powder bed (PB), a method for building an object (1, 2) and an electron beam powder bed fusion system (100). To provide an improved smoke-free process for electron beam powder bed fusion, enabling more complex geometries and reducing the need for postproduction/postprocessing of the built object following steps are proposed:
    - pre-sintering (S2) the cross sections (C1, C2) in the powder layer (Ln) by scanning the cross sections (C1, C2) with a first line energy,
    - fusing (S3) the cross sections (C1, C2) by scanning the cross sections (C1, C2) with a second line energy,
    wherein the second line energy exceeds the first line energy, preferably by at least a factor of 2 or at least a factor of 5.