| 摘要 |
A method for forming a three dimensional article (3) through successively depositing individual layers of powder material that are fused together with an electron beam from an electron beam source (6) so as to form the article. Providing a model of said three-dimensional article; a vacuum chamber (20, 20a, 20b) having at least a first (20a) and a second (20b) section, powder material that are fused together is provided in said first section, the at least one electron beam source is provided in said second section, wherein said first and second sections are openly connected to each other. Directing an electron beam from said at least one electron beam source over said work table (2) to fuse in first selected locations according to said model to form a first cross section of said three-dimensional article while supplying a gas (from 46, via 44, 50) to said second section of said vacuum chamber. |
