US 11,806,800 B2
X-ray calibration standard object
Johan Backlund, Onsala (SE); and Martin Wildheim, Moelndal (SE)
Assigned to Arcam AB, Mölnlycke (SE)
Filed by Arcam AB, Mölnlycke (SE)
Filed on Sep. 11, 2020, as Appl. No. 17/018,439.
Application 17/018,439 is a continuation of application No. 15/245,542, filed on Aug. 24, 2016, granted, now 10,807,187.
Claims priority of provisional application 62/232,135, filed on Sep. 24, 2015.
Prior Publication US 2020/0406389 A1, Dec. 31, 2020
This patent is subject to a terminal disclaimer.
Int. Cl. B23K 15/00 (2006.01); G01T 1/29 (2006.01); B29C 64/153 (2017.01); B33Y 50/00 (2015.01); H01J 37/305 (2006.01); B29C 64/20 (2017.01); B22F 10/28 (2021.01); B22F 12/90 (2021.01); B22F 10/31 (2021.01); B22F 12/52 (2021.01); B22F 12/55 (2021.01); B22F 10/32 (2021.01); B22F 10/36 (2021.01); B33Y 10/00 (2015.01); B33Y 50/02 (2015.01); H01J 37/30 (2006.01)
CPC B23K 15/0013 (2013.01) [B22F 10/28 (2021.01); B22F 10/31 (2021.01); B22F 12/90 (2021.01); B23K 15/002 (2013.01); B23K 15/0086 (2013.01); B29C 64/153 (2017.08); B29C 64/20 (2017.08); B33Y 50/00 (2014.12); G01T 1/29 (2013.01); H01J 37/305 (2013.01); B22F 10/32 (2021.01); B22F 10/36 (2021.01); B22F 12/52 (2021.01); B22F 12/55 (2021.01); B33Y 10/00 (2014.12); B33Y 50/02 (2014.12); H01J 37/3002 (2013.01); H01J 2237/2445 (2013.01); H01J 2237/30433 (2013.01); H01J 2237/30472 (2013.01); Y02P 10/25 (2015.11)] 20 Claims
OG exemplary drawing
 
1. A standard reference plate configured for insertion into an electron beam additive manufacturing apparatus for calibrating a size, shape, and position of an electron beam of the electron beam additive manufacturing apparatus, wherein the standard reference plate is configured for removal from the additive manufacturing apparatus after the calibrating, the standard reference plate comprising:
a lower plate and an upper plate being essentially in parallel and attached spaced apart from each other, the upper plate comprising a plurality of holes, wherein a predetermined hollow pattern is provided inside the holes, wherein a spacing between the holes and the size of the holes and a distance between the upper plate and the lower plate and a position of an x-ray sensor of the additive manufacturing apparatus with respect to the standard reference plate are arranged so that x-rays emanating from the lower plate, when at least a portion of the electron beam is passing through a hollow part of the hollow pattern, will not pass directly from the lower plate through any one of the holes to the x-ray sensor.
 
20. A method of using a standard reference plate in an additive manufacturing apparatus having an electron beam for melting powder layer by layer according to a predetermined pattern, the standard reference plate comprises:
a lower and an upper plate being essentially in parallel and attached spaced apart from each other, the upper plate comprising a plurality of holes, wherein a predetermined hollow pattern is provided-inside the holes, wherein the upper plate comprises a first and a second plate, the first plate comprising the holes, the second plate comprising the predetermined hollow pattern and wherein the second plate is positioned between the first plate and the lower plate, wherein a spacing between the holes and a size of the holes in the first plate and a distance between the upper plate and the lower plate and a position of an x-ray sensor with respect to the standard reference plate are arranged so that x-rays emanating from the lower plate, when at least a portion of the electron beam is passing through a hollow part of the hollow pattern, will not pass directly from the lower plate through any one of the plurality of holes to the x-ray sensor, wherein the method comprises:
inserting the standard reference plate for calibrating a size, shape and position of an electron beam;
removing, after the standard reference plate is inserted, the standard reference plate; and
manufacturing, after the standard reference plate is removed, one or more three-dimensional articles with the additive manufacturing apparatus.