Radial flow over a construction area

A manufacturing device for additive manufacturing of a three-dimensional component by layer-by-layer application and locally selective solidification of a building material using a plurality of irradiation units, the device comprising:

• a process chamber;
• at least one gas supply for supplying gas into the process chamber;
• at least one gas discharge for discharging gas from the process chamber;
• a building container open to the process chamber for receiving the building material and at least one component to be manufactured,
• wherein the building container at least partially surrounds a container recess,
• wherein a building field useable for manufacturing the component is provided above the building container, extends in a radial direction and is delimited from a building field recess which is not usable for manufacturing the component,
• wherein a building field recess region arranged in an inward radial direction outside the building field coincides with a cross-sectional area of the container recess;
• and
• a flow system to generate one gas flow in at least one radial flow direction over the building field,
• which comprises at least one outer flow guide with at least one outer flow opening and at least one central flow guide with at least one central flow opening, wherein at least one first flow opening of the at least one outer flow opening and of the at least one central flow opening is connectable to the gas discharge and at least one second flow opening of the at least one outer flow opening and of the at least one central flow opening is connectable to the gas supply in a gas-conducting manner,
• wherein the outer flow guide is arranged in a building field outer region, which is arranged outside the building field in an outward radial direction, and the central flow guide is arranged in the building field recess region, to generate the one gas flow.

A manufacturing method for additively manufacturing a three-dimensional component by layer-by-layer application and locally selective solidification of a building material within a building field using a plurality of irradiation units, the method comprising:

• supplying gas via a gas supply into a process chamber of a manufacturing device for additive manufacturing of the three-dimensional component,
• flowing the building field using a flow system, wherein
• at least one outer flow opening of at least one outer flow guide, which is arranged outside the building field in a building field outer region and in an outward radial direction,
• and
• at least one central flow opening of a central flow guide, which is arranged outside the building field in a building field recess region, which is arranged in an inward radial direction,
• is supplied with gas via the gas supply,
• wherein a gas flow extending in at least one substantially radial flow direction over the building field is generated between the central flow guide and the outer flow guide, the gas flow configured to carry impurities away from the building field of the radial flow direction;
• discharging gas from the process chamber via a gas discharge.