Methods for detecting a working area of a generative manufacturing device and manufacturing devices for generatively manufacturing components from a powder material
Methods for detecting a working area of a generative manufacturing device and manufacturing devices for generatively manufacturing components from a powder material are disclosed. The methods include scanning of an optical working beam of the generative manufacturing device in the working area, detecting signal values of remitted light of the optical working beam traveling along an optical axis of the optical working beam in a location-dependent manner, wherein a signal value is assigned to each location of the scan of the optical working beam in the working area, and obtaining an image of the working area from the location-dependent detected signal values. The optical working beam for detecting the working area is operated with an optical output power that is reduced compared to a lower power limit for the optical output power of the optical working beam used during generative manufacturing.
1 . A method for imaging a working area of a generative manufacturing device, the method comprising:
scanning an optical working beam of the generative manufacturing device, using a single scanner of the generative manufacturing device, across all or a portion or portions of the working area;
detecting signal values of remitted light of the optical working beam traveling along an optical axis of the optical working beam in a location-dependent manner, and assigning a signal value to each location of the scan of the optical working beam in the working area, wherein the signal value of the remitted light is detected by a light detector arranged on the optical axis of the optical working beam, and wherein the signal value is detected in a spatially resolved manner in that an output signal of the light detector is assigned in a time-dependent manner to a synchronous state of the single scanner for scanning the optical working beam;
making at least one notch on or in a surface of the preform and filling the notch with a working powder of the generative manufacturing device as a marking on the surface of the preform;
obtaining an image of a preform in the working area upon which a component is to be generatively built up from a powder material from the powder bed, from the location-dependent detected signal values; and
evaluating the image to analyze or monitor the preform in a coordinate system of the optical working beam or a coordinate system of the single scanner used to scan the optical working beam, wherein evaluating the image comprises determining a position of the preform within the working area based on at least one edge of the preform recognizable in the image; and
generatively building the component upon the preform in the working area via the optical working beam using the single scanner of the device,
wherein the optical working beam for detecting the working area is operated with an optical output power that is reduced compared to a lower power limit for the optical output power of the optical working beam used during generative manufacturing.
2 . The method of claim 1 , wherein the generative manufacturing device is arranged for building up a component layer-by-layer from a powder material, for carrying out a powder bed-based manufacturing process.
3 . The method of claim 1 , wherein
a) no interference signal is detected; and/or
b) signal values are detected which increase with increasing intensity of the remitted light; and/or
c) brightness values are detected as signal values.
4 . The method of claim 1 , further comprising evaluating the image of the working area for the recognition of geometric structures.
5 . The method of claim 1 , wherein the light detector that detects the signal value of the remitted light is a photodiode.
6 . The method of claim 1 , further comprising adjusting a resolution of a detection and/or a detection section of the working area.
7 . The method of claim 1 , wherein a position of the preform within the working area is further determined based on the marking on the surface of the preform.
8 . A manufacturing device for generatively manufacturing a component from a powder material, comprising:
a beam device arranged to generate an optical working beam to generatively manufacture the component from the powder material using the optical working beam;
a working area arranged to support generatively manufacturing the component from the powder material upon the working area;
a single scanner arranged to scan the optical working beam across all or a portion or portions of the working area;
a light detector arranged to detect remitted light of the optical working beam traveling along an optical axis of the optical working beam, wherein the light detector is arranged on the optical axis of the optical working beam; and
a control device arranged
to control the single scanner for scanning the optical working beam in the working area to detect location-dependent signal values of the light detector during the scan of the optical working beam,
to assign a signal value of the light detection to each location of the scan of the optical working beam in the working area, wherein the signal value of the remitted light detected by the light detector is detected in a spatially resolved manner in that an output signal of the light detector is assigned in a time-dependent manner to a synchronous state of the single scanner for scanning the optical working beam to obtain an image of a preform in the working area upon which the component is to be generatively built up from the powder material within the working area, from the location-dependent detected signal values, wherein the preform includes at least one notch on or in a surface of the preform, and wherein the notch is filled with a working powder of the generative manufacturing device as a marking on the surface of the preform, and
to evaluate the image to analyze or monitor the preform in a coordinate system of the optical working beam or a coordinate system of the single scanner used to scan the optical working beam, wherein evaluating the image comprises determining a position of the preform within the working area based on at least one edge of the preform recognizable in the image; and
to control the single scanner to generatively build the component upon the preform in the working area; wherein
the control device is arranged to operate the optical working beam for detecting the working area with an optical output power that is reduced compared to a lower power limit for the optical output power of the optical working beam for generative manufacturing.
9 . The manufacturing device of claim 8 , wherein the beam device comprises a laser.
10 . The manufacturing device of claim 9 , wherein the laser is a pulsed laser.
11 . The manufacturing device of claim 9 , wherein the laser is a continuous laser.
12 . The manufacturing device of claim 8 , wherein the light detector comprises a photodiode.
13 . The method of claim 1 , wherein determining the position of the preform in the working area comprises determining the position with an accuracy of a few tenths of a micron.