Method and apparatus for additive manufacturing

摘要

A method for forming a three-dimensional article comprising the steps of: applying a model of the three dimensional article, applying a first powder layer on a work table, directing a first electron beam from a first electron beam source over the work table causing the first powder layer to fuse in first selected locations according to the model to form a first cross section of the three-dimensional article, directing a second electron beam from a second electron beam source over the work table, registering at least one setting of the first electron beam source, registering at least one setting of the second electron beam source, correcting the position of the second electron beam depending on the at least one setting of the first electron beam source and the at least one setting of the second electron beam source.

主权项

1. 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, the apparatus comprising:
an electronically produced model of the three dimensional article; a powder distributor configured to provide a first powder layer on a work table; at least one control unit configured to:
direct a first electron beam from a first electron beam source over the work table causing the first powder layer to fuse in first selected locations according to the model to form a first part of a first cross section of the three-dimensional article;direct a second electron beam from a second electron beam source over the work table causing the first powder layer to fuse in second selected locations according to the model to form a second part of the first cross section of the three-dimensional article;register at least one setting of the first electron beam source; andregister at least one setting of the second electron beam source; and a correcting unit configured to correct the position of the second electron beam depending on the at least one setting of the first electron beam source and the at least one setting of the second electron beam source for aligning a desired second electron beam position according to the model with a real second electron beam position.