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Additive manufacturing defect detection method and additive manufacturing apparatus

A technology of additive manufacturing and defect detection, applied in the field of additive manufacturing, can solve problems such as image information misdetection or missed detection, detection lag, etc., to achieve the effect of increasing yield, reducing defect generation, and avoiding defect detection lag

Active Publication Date: 2017-07-28
TIANJIN RES INST FOR ADVANCED EQUIP TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for detecting defects in additive manufacturing and an additive manufacturing device, so as to solve the problems of defect detection lag in defect detection in the existing additive manufacturing process, and the obtained image information is easy to cause false detection or missed detection.

Method used

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  • Additive manufacturing defect detection method and additive manufacturing apparatus
  • Additive manufacturing defect detection method and additive manufacturing apparatus
  • Additive manufacturing defect detection method and additive manufacturing apparatus

Examples

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example 1

[0064] Example 1: can refer to figure 2 , figure 2 is a schematic diagram of the above standard image, which at this time shows the control image of the current unprocessed powder thin layer or the visible light image before the powder is not scraped. image 3 is the fused imaging image obtained after the warm-up scan of the visible light image and the electronic imaging image fused, from image 3 It can be seen that due to the uneven laying of the powder thin layer, there will be no powder coverage or less powder coverage on the lower right side, and the visible light image can identify two areas, one part with thicker powder layer and one part with thinner powder. However, the printed area may not necessarily be recognized. The electronic imaging device can recognize the printed area. By fusing the visible light image with the electronic imaging image, a clear powder layer distribution and an image of the printed area can be obtained. figure 2 By comparison, the powder ...

example 2

[0065] Example 2: In this example, Figure 4 It is a schematic diagram of the fusion imaging image after the fusion of visible light image and infrared image, which contains topography and heat distribution information; Figure 5 It is a schematic diagram of the fusion imaging image obtained by the fusion of the secondary electron image obtained from the electron imaging image and the backscattered electron image, which contains the morphology and composition distribution information; Image 6 It is a schematic diagram of the fused imaging image after the fusion of visible light image, infrared image and electronic imaging image, which contains various information such as morphology, heat distribution, and composition distribution. can Figure 4 and Figure 5 respectively with figure 2 In contrast, at this time Figure 4 shows the existence of morphological defects B, Figure 5 It also shows that there is a morphological defect B in the powder, so it can be accurately ju...

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Abstract

Belonging to the field of additive manufacturing, the invention discloses an additive manufacturing defect detection method. The method includes: at least in the preheating and / or melting stage, acquiring a visible light image and / or infrared image through an image shooting device, and acquiring an electronic imaging image through an electronic imaging device; contrasting the visible light image and / or infrared image and the electronic imaging image with a standard image independently or after fusion, if a difference exists, determining the existence of a defect at the preheating and / or melting stage. The invention also discloses an additive manufacturing apparatus, which consists of a forming chamber, the image shooting device, and the electronic imaging device. According to the invention, the visible light image and / or infrared image can be acquired by the image shooting device, the electronic imaging image is acquired through the electronic imaging device, and the images are contrasted with the standard image independently or after fusion, and whether a defect exists can be judged according to the contrast result. The method and the device provided by the invention have the advantages of accurate detection, low probability of false detection or leak detection, and avoids the problem of defect detection lag in existing defect detection.

Description

technical field [0001] The invention relates to the technical field of additive manufacturing, in particular to a method for detecting defects in additive manufacturing and an additive manufacturing device. Background technique [0002] Additive manufacturing (3D printing) is a manufacturing technique that builds three-dimensional objects by continuously fusing more than one thin layer of material. Powder bed additive manufacturing is a kind of additive manufacturing technology route, and its basic process steps are as follows: the powder supply and leveling system spreads the powder material into a thin layer on the working platform, and the high energy density ray beam (laser or Electron beam) scans a section of the three-dimensional object on the thin powder layer; after that, the working platform descends a distance of the thickness of the powder thin layer, lays a new layer of powder on the working platform, and ray scans the next section of the three-dimensional object...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/88G01N23/00G01N23/203G01N23/22B29C64/386B29C64/188B29C64/153B33Y40/00
CPCG01N21/88G01N23/00G01N23/203G01N23/22B33Y40/00Y02P10/25
Inventor 马旭龙林峰郭超
Owner TIANJIN RES INST FOR ADVANCED EQUIP TSINGHUA UNIV
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