Camera-based determining of roughness for additively manufactured components

Patent metadata

Field	Value
Publication number	US-2017266886-A1
Application number	US-201515503517-A
Country	US
Kind code	A1
Filing date	May 20, 2015
Priority date	Jul 30, 2014
Publication date	Sep 21, 2017
Grant date	—

Abstract

The invention relates to a method and a device for the additive manufacturing of components by the layer-by-layer joining of powder particles to one another and/or to an already created pre-product or substrate, via the selective interaction of the powder particles with a high-energy beam ( 13 ) to create a layer, wherein a formed layer ( 14 ) is captured using a camera ( 6 ), wherein a contour of the deposited layer ( 14 ) is determined from an image of the deposited layer captured by the camera ( 6 ), and wherein the roughness of the surfaces of the formed component is determined from the contour.

First claim

1 . A method for the additive manufacture of components by layer-by-layer joining of powder particles to one another and/or to an already produced pre-product or substrate, via selective interaction of the powder particles with a high-energy beam ( 13 ), for the formation of a layer, wherein a formed layer ( 14 ) is captured with a camera ( 6 ),
wherein a contour surface of the deposited layer ( 14 ) is determined from an image of the deposited layer captured with the camera ( 6 ), and in that the roughness of a surface of the formed component is determined from the contour surface.

2 . The method according to claim 1 , wherein
a high-resolution camera ( 6 ) is used, the resolution of which makes possible the resolution of an individual region of impact of the high-energy beam ( 13 ) or one-half or one-third of the diameter or a maximum dimension of an impact region of the high-energy beam.

3 . The method according to claim 1 , wherein
the high-energy beam ( 13 ) is a laser beam or an electron beam.

4 . The method according to claim 1 , wherein
the roughness of at least one surface of the component is determined from the comparison of the target course and the actual course of the contour surface and/or from the cast shadow of the contour surface and/or the width of the contour surface and/or the sharpness of the contour surface.

5 . The method according to claim 1 , wherein
a height profile is determined at the contour surface and is used for determining the roughness of a surface of the component.

6 . The method according to claim 1 , wherein
an averaged contour line is determined from the contour surface and this is used for determining the roughness.

7 . The method according to claim 1 , wherein
a plurality of images of an individual deposited layer ( 14 ) is captured by the camera from different perspectives and/or with different illumination.

8 . The method according to claim 1 , wherein
the determined roughness is used for regulating the parameters for the deposition of subsequent layers and/or for subsequent improving or for re-working the monitored layer.

9 . The method according to claim 1 , wherein
the determined roughness is documented for characterizing the component.

10 . The method according to claim 1 , wherein a device is provided for the additive manufacture of components, by layer-by-layer joining of powder particles to one another and/or to an already produced pre-product or substrate, via selective interaction of the powder particles with a high-energy beam ( 13 ), for the formation of a layer, wherein the device comprises a platform ( 2 ) for supporting the component being produced, a unit for the layer-by-layer disposition of powder, a unit for generating a high-energy beam ( 4 ), and at least one camera ( 6 ) for imaging a deposited layer,
wherein in addition, the device comprises an analysis unit that can receive an image captured by the camera ( 6 ) and determines a contour of the deposited layer ( 14 ) from the image of the deposited layer captured by the camera ( 6 ), and/or determines the roughness of a surface of the formed component from the contour surface.

11 . The method according to claim 10 ,
wherein the device includes at least one camera or a plurality of cameras is or are arranged so that a deposited layer ( 14 ) can be captured under different viewing angles.

12 . The method according to claim 10 ,
wherein the camera is a high-resolution camera ( 6 ), the resolution of which makes possible the resolution of an individual region of impact of the high-energy beam ( 13 ) or one-half or one-third of the diameter or a maximum dimension of an impact region of the high-energy beam.

13 . The device method according to claim 10 , wherein
the analysis unit provides the analysis result of a control and/or regulating system for the control and/or regulation of the device.

Assignees

• MTU Aero Engines AG

Inventors

• Hess Thomas
• Schlick Georg
• Ladewig Alexander

Classifications

• B29C64/153 Primary

  using layers of powder being selectively joined, e.g. by selective laser sintering or melting · CPC title

• B33Y50/02

  for controlling or regulating additive manufacturing processes · CPC title

• B29C64/393

  for controlling or regulating additive manufacturing processes · CPC title

• B33Y10/00 Primary

  Processes of additive manufacturing · CPC title

• B22F12/90

  Means for process control, e.g. cameras or sensors · CPC title