Methods and procedure of referenced in situ control of lateral contour displacements in additive manufacturing
<p>Additive manufacturing technologies are further developing from prototype to serial production. This trend requires rising challenges to the process-accompanying quality assurance. Optical in situ quality control approaches show great potential to generate accurate measurement data, which a...
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2021-08-01
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| Series: | Journal of Sensors and Sensor Systems |
| Online Access: | https://jsss.copernicus.org/articles/10/219/2021/jsss-10-219-2021.pdf |
| _version_ | 1818910301825794048 |
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| author | M. Lerchen M. Lerchen J. Hornung Y. Zou T. Hausotte T. Hausotte |
| author_facet | M. Lerchen M. Lerchen J. Hornung Y. Zou T. Hausotte T. Hausotte |
| author_sort | M. Lerchen |
| collection | DOAJ |
| description | <p>Additive manufacturing technologies are further developing from prototype to serial production.
This trend requires rising challenges to the process-accompanying quality assurance.
Optical in situ quality control approaches show great potential to generate accurate measurement data, which are essential for feedback control.
If a reliable referencing concept for the layer-by-layer measured data is guaranteed, contour information can be used during the manufacturing to correct occurring geometrical deviations.
Within this scientific study, two methods of optical, referenced in situ control of lateral displacements of additive manufactured contours are presented.
In the first approach the 2-D contour of the melting pool is analysed in relation to a position-stable reference system implemented in the powder bed.
The second approach uses the translucent contour of deeper layers covered with powder as a reference.
Within the image evaluation several pre-processing steps like calibration, undistortion, rectification, illumination correction and low-pass filtering are essential for reliable and correct geometric measurements.
The following adapted contour detection and position determination of the referenced melting pool contours are based on an extended edge detection algorithm according to <span class="cit" id="xref_text.1"><a href="#bib1.bibx6">Canny</a> (<a href="#bib1.bibx6">1986</a>)</span>.
With the evaluation of further manufacturing layers of already lowered powder bed levels, it is possible to specify the influence of powder application on geometrical displacements separately.
This is done by a comparison of the position of the detected powder-covered melting pool contours with the previously applied melted region.
Consequently a better understanding of lateral contour displacements within the additive manufacturing process is the goal, which is important for a process-accompanying correction of geometrical deviations.</p> |
| first_indexed | 2024-12-19T22:40:38Z |
| format | Article |
| id | doaj.art-244e52de18654f51bd8f83b311625b0b |
| institution | Directory Open Access Journal |
| issn | 2194-8771 2194-878X |
| language | English |
| last_indexed | 2024-12-19T22:40:38Z |
| publishDate | 2021-08-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Journal of Sensors and Sensor Systems |
| spelling | doaj.art-244e52de18654f51bd8f83b311625b0b2022-12-21T20:03:05ZengCopernicus PublicationsJournal of Sensors and Sensor Systems2194-87712194-878X2021-08-011021923210.5194/jsss-10-219-2021Methods and procedure of referenced in situ control of lateral contour displacements in additive manufacturingM. Lerchen0M. Lerchen1J. Hornung2Y. Zou3T. Hausotte4T. Hausotte5Institute of Manufacturing Metrology (FMT), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Nägelsbachstr. 25, 91052 Erlangen, GermanyCollaborative Research Centre 814 – Additive Manufacturing, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), GermanyInstitute of Manufacturing Metrology (FMT), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Nägelsbachstr. 25, 91052 Erlangen, GermanyInstitute of Manufacturing Metrology (FMT), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Nägelsbachstr. 25, 91052 Erlangen, GermanyInstitute of Manufacturing Metrology (FMT), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Nägelsbachstr. 25, 91052 Erlangen, GermanyCollaborative Research Centre 814 – Additive Manufacturing, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Germany<p>Additive manufacturing technologies are further developing from prototype to serial production. This trend requires rising challenges to the process-accompanying quality assurance. Optical in situ quality control approaches show great potential to generate accurate measurement data, which are essential for feedback control. If a reliable referencing concept for the layer-by-layer measured data is guaranteed, contour information can be used during the manufacturing to correct occurring geometrical deviations. Within this scientific study, two methods of optical, referenced in situ control of lateral displacements of additive manufactured contours are presented. In the first approach the 2-D contour of the melting pool is analysed in relation to a position-stable reference system implemented in the powder bed. The second approach uses the translucent contour of deeper layers covered with powder as a reference. Within the image evaluation several pre-processing steps like calibration, undistortion, rectification, illumination correction and low-pass filtering are essential for reliable and correct geometric measurements. The following adapted contour detection and position determination of the referenced melting pool contours are based on an extended edge detection algorithm according to <span class="cit" id="xref_text.1"><a href="#bib1.bibx6">Canny</a> (<a href="#bib1.bibx6">1986</a>)</span>. With the evaluation of further manufacturing layers of already lowered powder bed levels, it is possible to specify the influence of powder application on geometrical displacements separately. This is done by a comparison of the position of the detected powder-covered melting pool contours with the previously applied melted region. Consequently a better understanding of lateral contour displacements within the additive manufacturing process is the goal, which is important for a process-accompanying correction of geometrical deviations.</p>https://jsss.copernicus.org/articles/10/219/2021/jsss-10-219-2021.pdf |
| spellingShingle | M. Lerchen M. Lerchen J. Hornung Y. Zou T. Hausotte T. Hausotte Methods and procedure of referenced in situ control of lateral contour displacements in additive manufacturing Journal of Sensors and Sensor Systems |
| title | Methods and procedure of referenced in situ control of lateral contour displacements in additive manufacturing |
| title_full | Methods and procedure of referenced in situ control of lateral contour displacements in additive manufacturing |
| title_fullStr | Methods and procedure of referenced in situ control of lateral contour displacements in additive manufacturing |
| title_full_unstemmed | Methods and procedure of referenced in situ control of lateral contour displacements in additive manufacturing |
| title_short | Methods and procedure of referenced in situ control of lateral contour displacements in additive manufacturing |
| title_sort | methods and procedure of referenced in situ control of lateral contour displacements in additive manufacturing |
| url | https://jsss.copernicus.org/articles/10/219/2021/jsss-10-219-2021.pdf |
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