Homogenization of the energy input

A layer-wise additive manufacturing method for the manufacture of at least one three-dimensional object, wherein in the layer-wise additive manufacturing method the object is manufactured by applying a building material layer by layer and by solidifying the building material by a supply of radiation energy to all positions in a layer that correspond to the cross-section of the object in this layer in that these positions are scanned with energetic radiation by means of an energy input device such that the energy input device directs at least one energy beam to predetermined positions of a building material layer so that the energy beam effects a solidification of the building material, wherein the layer-wise additive manufacturing method comprises:

• a computer-based method of providing control data for a layer-wise additive manufacturing apparatus for manufacturing a three-dimensional object,
• wherein the object is manufactured by means of the layer-wise additive manufacturing apparatus by applying a building material layer by layer and by solidifying the building material by a supply of radiation energy to all positions in a layer that correspond to the cross-section of the object in this layer in that these positions are scanned with energetic radiation by means of an energy input device such that the energy input device directs at least one energy beam to predetermined positions of a building material layer so that the energy beam effects a solidification of the building material,
• said method of generating a control dataset comprising a first step of accessing a dataset that includes a data model of a number of building material layers to be selectively solidified during the manufacture, wherein in each of the layers of the data model positions corresponding to an object cross-section are marked, at which positions a solidification of the building material shall be carried out,
• wherein in the dataset in at least one layer of the data model it is specified at least for a partial region of an object cross section in which chronological order an energy beam is to be moved in scan lines across the positions of this partial region for a scanning of the building material,
• characterised in that in a second step the dataset is modified such that in at least one layer of the data model for the respective partial region of an object cross section it is checked whether the scanning time needed for the scanning of the building material along a scan line falls below a predetermined minimum length of time tmin and if this is detected for a scan line, a reduced energy density of the energy beam during the scanning of the building material along this scan line is specified and/or after the scanning along the scan line a waiting time is specified before the energy beam is moved along a further scan line,
• wherein the reduced energy density of the energy beam is specified such that the more the predetermined minimum length of time tmin is underrun, the lower the energy density of the energy beam that is specified,
• and
• in a third step the dataset that was modified in the second step is provided for the generation of a control dataset for the layer-wise additive manufacturing apparatus.