Combining AM software with CT machining to speed up validation
By working together with GE Sensing, we were able to accelerate the validation of AM parts and reduce NDT costs substantially. During the qualification phase we took CT scans of metal aerospace parts with GE’s highly accurate and scatter-correct CT machine solutions and analyzed the parts for printing errors with our AM process simulation and in-process inspection software.
This showed that our software was capable of predicting the effects of the AM process and defining regions of interest and possible types of printing errors in advance. The software also helped to quickly identify why these errors occurred and how to avoid them in the next build. After taking a CT scan of the titanium aerospace part below, we noticed a clearly visible stress line. This stress line could be recognized when looking at the simulation results. Simulating a build beforehand increases the chances of predicting and avoiding distortion in your finished results.
In addition, the CT scans indicated a small deviation located at the feet of the part. This deviation is not visible to the naked eye. We can explain this through the fact that the build was stopped because a part on the same build platform crashed. The deviation in the part was found exactly at the height where the build was paused to remove (stop building) the failing part. Thanks to the online error detection functionality of Materialise Inspector, the build operator received a warning that there was something wrong with a part. After removing this part, the aerospace part could continue to be printed.
These and other valuable machine learning insights showed exactly where the problem was situated, decreasing the lead time of this printing project from 9 to 6 weeks and leading to a cost reduction of several thousand euros.
Consequences for the future
By systematically collecting data from the different building blocks of the workflow with Materialise’s software platform, several benefits pop up.
AM users are able to qualify their manufacturing parts more cost-effectively and faster than before, using AM process simulation analysis and correlating their in-process AM data with highly accurate CT data, giving them unprecedented insights for a root cause analysis of the quality issues of AM parts. Users can better understand the physics behind three recurring problems: stress lines, porosity and warpage. This makes it possible to find the right orientation and proper process parameters faster and more easily.
Engineers that contribute to the creation of 3D printing machines can explore AM processes more in-depth (when using Materialise’s Control Platform) and stabilize them with confidence.
CT Quality Engineers can apply the results of AM data analysis to define a more effective and efficient quality and testing program when moving from qualification to serial manufacturing.