METHOD FOR ADDITIVELY MANUFACTURING AT LEAST ONE THREE-DIMENSIONAL OBJECT

1 . Method for additively manufacturing at least one three-dimensional object ( 2 ) by means of successive layerwise selective irradiation and consolidation of build material layers ( 3 ), whereby each build material layer ( 3 ) comprises at least one irradiation area (IA) which is to be irradiated and consolidated by means of at least one energy beam ( 5 ), wherein

the successive layerwise selective irradiation and consolidation of respective irradiation areas (IA) is performed on basis of at least one irradiation parameter set (IPS) resulting in a specific amount of energy input into the irradiation area (IA) of a respective build material layer ( 3 ), whereby the at least one irradiation parameter set (IPS) comprises at least one irradiation parameter, whereby

a first irradiation parameter set (IPS 1 ) and at least one further irradiation parameter set (IPS 2 ) is used, whereby

the first irradiation parameter set (IPS 1 ) allows for a first amount of energy input into an irradiation area (IA) of a first build material layer ( 3 ) which results in a connection of the irradiation area (IA) of the first build material layer ( 3 ) with selectively irradiated and consolidated areas of a second build material layer ( 3 ) directly disposed below the first build material layer ( 3 ), and

the at least one further irradiation parameter set (IPS 2 ) allows for a further amount of energy input into an irradiation area (IA) of a first build material layer ( 3 ) which results in a connection of the irradiation area (IA) of the first build material layer ( 3 ) with the selectively irradiated and consolidated areas of a second build material layer ( 3 ) directly disposed below the first build material layer ( 3 ) and at least one further build material layer ( 3 ) directly disposed below the second build material layer ( 3 ).

2 . Method according to claim 1 , comprising dividing at least one irradiation area (IA) of at least one build material layer ( 3 ) in at least one first sub-area (SA 1 ) and at least one further sub-area (SA 2 ) on basis of at least one division criterion, whereby

the at least one first sub-area (SA 1 ) is irradiated with the first irradiation parameter set (IPS 1 ), and

the at least one further sub-area (SA 2 ) is irradiated with the further irradiation parameter (IPS 2 ) set, or vice versa.

3 . Method according to claim 2 , wherein the division criterion refers to a structural property of the three-dimensional object ( 2 ) which is to be additively manufactured in the respective sub-area (SA) of the respective build material layer ( 3 ).

4 . Method according to claim 3 , wherein the structural property is or indicates a mechanical stability of the three-dimensional object ( 2 ) in the respective sub-area (SA) of the respective build material layer ( 3 ).

5 . Method according to claim 2 , wherein the division criterion refers to a geometric property of the three-dimensional object ( 2 ) which is to be additively manufactured in the respective sub-area (SA) of the respective build material layer ( 3 ).

6 . Method according to claim 5 , wherein the geometric property is or indicates an overhanging portion (OS) of the three-dimensional object ( 2 ) in the respective sub-area (SA) of the respective build material layer ( 3 ).

7 . Method according to claim 5 , wherein the geometric property is or indicates a dimension of the three-dimensional object ( 2 ), particularly a length and/or width of the three-dimensional object ( 2 ), in the respective sub-area (SA) of the respective build material layer ( 3 ) above or below a pre-definable or pre-defined threshold value.

8 . Method according to claim 5 , wherein the geometric property is or indicates a freely exposed outer contour section (OC) of the three-dimensional object ( 2 ) in the respective sub-area (SA) of the respective build material layer ( 3 ) or indicates a core-portion (CS) of the three-dimensional object ( 2 ) in the respective sub-area (SA) of the respective build material layer ( 3 ).

9 . Method according to claim 1 wherein the further irradiation parameter set (IPS 2 ) comprises at least one irradiation parameter resulting in a higher energy input, particularly a depth of penetration of the energy input, into the irradiation area (IA) of a respective build material layer ( 3 ) compared with the first irradiation parameter set (IPS 1 ), or vice versa.

10 . Method according to claim 1 wherein the first irradiation parameter set (IPS 1 ) is applied in every build material layer ( 3 ) and wherein the further irradiation parameter set (IPS 2 ) is not applied in every build material layer ( 3 ).

11 . Method according to claim 10 , wherein the at least one further irradiation parameter set (IPS 2 ) is only applied in every other build material layer ( 3 ).

12 . Control unit ( 6 ) for an apparatus ( 1 ) for additively manufacturing at least one three-dimensional object ( 2 ) by means of successive layerwise selective irradiation and consolidation of build material layers ( 3 ), whereby each build material layer ( 3 ) comprises at least one irradiation area (IA) which is to be irradiated and consolidated by means of at least one energy beam ( 5 ), whereby

the control unit ( 6 ) is configured to control the successive layerwise selective irradiation and consolidation of respective irradiation areas (IA) in accordance with the method according to claim 1 .

13 . Apparatus ( 1 ) for additively manufacturing at least one three-dimensional object ( 2 ) by means of successive layerwise selective irradiation and consolidation of build material layers ( 3 ), whereby each build material layer ( 3 ) comprises at least one irradiation area (IA) which is to be irradiated and consolidated by means of at least one energy beam ( 5 ), the apparatus ( 1 ) comprising a control unit ( 6 ) according to claim 12 .