Method for Automatic Calibration of a Device for Generative Production of a Three-Dimensional Object

摘要

A method for automatically calibrating a device for generatively producing a three-dimensional object (8) comprises the following steps: irradiating an applied layer of a material (3) or a target by means of a first scanner (14) in order to produce a first test pattern (33) in the material (3) or the target; irradiating the applied layer of the material (3) or the target by means of a second scanner (15) in order to produce a second test pattern (34) in the material (3) or the target; detecting the first and second test patterns (33, 34) by means of a camera (24) and assigning the first and second test patterns (33, 34) to the first and second scanners (14, 15), respectively; comparing the first and/or the second test pattern (33, 34) with a reference pattern and/or comparing the first and second test patterns (33, 34) with one another; determining a first deviation of the first test pattern (33) from the reference pattern and/or a second deviation of the second test pattern (34) from the reference pattern and/or a relative deviation between the first test pattern (33) and the second test pattern (34); and calibrating the first and/or the second scanner (14, 15) in such a way that the first and/or the second deviation from the reference pattern and/or the relative deviation between the first test pattern (33) and the second test pattern (34) falls below a setpoint value.

主权项

1. A method for automatically calibrating a device for generatively producing a three-dimensional object, wherein the device comprises the following:
a construction zone, in which the object is to be constructed layer by layer by selective consolidation of a pulverulent material, an irradiation device for emitting electromagnetic radiation onto selective regions of the applied layer of the material, wherein the irradiation device comprises at least one first and one second scanner and the first scanner irradiates a first scan zone in the construction zone, and the second scanner irradiates a second scan zone in the construction zone; and a control unit for controlling the device, characterized by the following steps: irradiating an applied layer of the material or a target by means of the first scanner in order to produce a first test pattern in the material or the target; irradiating the applied layer of the material or the target by means of the second scanner in order to produce a second test pattern in the material or the target; detecting the first and second test patterns by means of a camera and assigning the first and second test patterns to the first and second scanners, respectively; comparing the first and second test patterns with one another; determining a relative deviation between the first test pattern and the second test pattern; calibrating the first and/or the second scanner in such a way that the relative deviation between the first test pattern and the second test pattern falls below a setpoint value.