Layer-wise powder deposition defect detection in additive manufacturing

Adriaan Hendriks; R. Ramokolo; Chris Ngobeni; M. Moroko; Darryl Naidoo

doi:10.1117/12.2509571

4 March 2019 Layer-wise powder deposition defect detection in additive manufacturing

Adriaan Hendriks, R. Ramokolo, Chris Ngobeni, M. Moroko, Darryl Naidoo

Proceedings Volume 10909, Laser 3D Manufacturing VI; 109090O (2019) https://doi.org/10.1117/12.2509571
Event: SPIE LASE, 2019, San Francisco, California, United States

Abstract

Additive manufacturing applications, in areas such as aerospace and medicine, are limited due to the lack of process stability and quality management. In particular, geometrical inaccuracies and the presence of mechanical defects hinder repeatability of the process¹. A great disadvantage of AM is that verifying the quality of AM produced parts are mainly done after part fabrication which does not allow the operator to act upon defects observed during the actual build. To break into industries with very high quality standards, an important issue to be addressed is in-situ quality control during a build^{2, 3}. If defects on a new powder layer can be detected before laser melting occurs, a new layer may be suitably recoated or the process can be paused for user controlled rectification. The work which will be presented here is focused on image based process monitoring of a powder bed additive manufacturing system using a shadow casting method. As a proof of principle, a few main defects during recoating will be identified and analyzed to establish the severity and possible impact of the defects on metal powder consolidation. Preliminary results of defects identified before and after material consolidation will be shown. For this, a software package is in development to automatically detect defects. This is aimed towards developing a system which in the future will contribute to quality assurance.

Conference Presentation

Citation Download Citation

Adriaan Hendriks, R. Ramokolo, Chris Ngobeni, M. Moroko, and Darryl Naidoo "Layer-wise powder deposition defect detection in additive manufacturing", Proc. SPIE 10909, Laser 3D Manufacturing VI, 109090O (4 March 2019); https://doi.org/10.1117/12.2509571

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available