| 摘要 |
A method for producing three-dimensional work pieces comprises the steps of supplying gas to a process chamber (12) accommodating a carrier (16) and a powder application device (14), applying a layer of raw material powder onto the carrier (16) by means of the powder application device (14), selectively irradiating electromagnetic or particle radiation onto the raw material powder applied onto the carrier (16) by means of an irradiation device (14), discharging gas containing particulate impurities from the process chamber (12), and controlling the operation of the irradiation device (14) by means of a control unit (38) such that a radiation beam (22) emitted by at least one radiation source (24) of the irradiation device (18) is guided over the layer of raw material powder applied onto the carrier (16) according to a radiation pattern (56, 56') containing a plurality of scan vectors (V, V'), wherein the scan vectors (V, V', V"), in at least a section of the radiation pattern (56, 56', 56"), extend substantially parallel to each other, and wherein at least every other scan vector (V, V', V") of the substantially parallel scan vectors (V, V', V") extends at an angle (³, ³', ³") between 0° and 90° or between 270° and 360° with respect to a direction of flow (F) of a gas stream flowing through the process chamber (12). |
