APPARATUS FOR ADDITIVELY MANUFACTURING OF THREE-DIMENSIONAL OBJECTS

1 . Apparatus ( 13 ) for additively manufacturing of three-dimensional objects ( 14 ) by means of successive layerwise selective irradiation and consolidation of layers of a build material ( 15 ) which can be consolidated by means of an energy beam ( 16 ), wherein the apparatus ( 13 ) comprises a measuring unit ( 1 ) configured to measure a path velocity of the energy beam ( 16 ) generated by a beam generating unit, characterized in that the measuring unit ( 1 ) comprises at least two measuring means ( 9 , 10 ) located in measuring positions ( 3 , 4 ) at a defined distance ( 5 ).

2 . Apparatus according to claim 1 , characterized in that at least one measuring position ( 3 , 4 ) is located in a fixed position inside a process chamber, in particular in a build plane ( 20 ) and/or in that at least one measuring position ( 3 , 4 ) is located on a component of the apparatus, in particular an application unit ( 21 ).

3 . Apparatus according to claim 2 , characterized in that the measuring positions ( 3 , 4 ) are located in a build plate ( 2 ) of the apparatus ( 13 ) or the measuring positions ( 3 , 4 ) are located in a structure element insertable in the apparatus ( 13 ).

4 . Apparatus according to claim 1 , characterized in that the measuring means ( 9 , 10 ) are configured to generate a measuring signal upon irradiation by an energy beam or by the energy beam ( 16 ).

5 . Apparatus according to claim 1 , characterized in that the measuring means ( 9 , 10 ) are built as or comprise at least one sensor, in particular a photo diode, sensitive for radiation of a wavelength of an energy beam or a wavelength of the energy beam ( 16 ).

6 . Apparatus according to claim 1 , characterized by a measuring unit ( 1 ) configured to determine the time or time difference between a generation of at least two signals by the energy beam ( 16 ) irradiating the at least two measuring means ( 9 , 10 ) in the at least two measuring positions ( 3 , 4 ) and to determine the corresponding path velocity of the energy beam ( 16 ) based on the path ( 6 ) of the energy beam ( 16 ) between the at least two measuring positions ( 3 , 4 ) and the determined time.

7 . Apparatus according to claim 1 , characterized in that the build plate ( 2 ) or the structure element, preferably arranged in a build plane ( 20 ), comprises at least two reception rooms ( 7 , 8 ) located in the measuring positions ( 3 , 4 ), wherein the reception rooms ( 7 , 8 ) are configured to receive the measuring means ( 9 , 10 ).

8 . Apparatus according to claim 2 , characterized by a plurality of, in particular more than two, measuring means ( 9 , 10 ) and/or measuring positions ( 3 , 4 ) distributed across the build plane ( 20 ).

9 . Apparatus according to claim 1 , characterized by a filter unit ( 12 ) arranged between at least one measuring means ( 9 , 10 ) and the beam generating unit, wherein the filter unit ( 12 ) is configured to weaken the energy beam ( 16 ) to a defined degree and/or to filter radiation with wavelengths differing from the energy beam ( 16 ).

10 . Measuring unit ( 1 ), in particular for an apparatus according to claim 1 , comprising at least two measuring means ( 9 , 10 ) locatable or located in measuring positions ( 3 , 4 ) at a defined distance ( 5 ).

11 . Method for operating at least one apparatus ( 13 ) for additively manufacturing three-dimensional objects ( 14 ) by means of successive layerwise selective irradiation and consolidation of layers of a build material ( 15 ) which can be consolidated by means of an energy beam ( 16 ), wherein a path velocity of the energy beam ( 16 ) is determined via the measurement of time the energy beam ( 16 ) requires to travel a defined distance ( 5 ) from a first measuring position ( 3 , 4 ) to at least one second measuring position ( 3 , 4 ).

12 . Method for operating at least one apparatus ( 13 ) for additively manufacturing three-dimensional objects ( 14 ) by means of successive layerwise selective irradiation and consolidation of layers of a build material ( 15 ) which can be consolidated by means of an energy beam ( 16 ), wherein a path velocity of the energy beam ( 16 ) is determined via the measurement of time the energy beam ( 16 ) requires to travel a defined distance ( 5 ) from a first measuring position ( 3 , 4 ) to at least one second measuring position ( 3 , 4 ), characterized in that the method is performed on an apparatus ( 13 ) according to claim 1 .