Precision manufacturing using additive manufacturing
Typ
Examensarbete för masterexamen
Program
Product development (MPPDE), MSc
Publicerad
2021
Författare
Ohlsson, Martin
Pasupulate Suresh, Akshaykumar
Modellbyggare
Tidskriftstitel
ISSN
Volymtitel
Utgivare
Sammanfattning
Additive Manufacturing can be used for additive manufacturing complex parts with
limitations to size of the feature and capability of the machine. There exist several
technologies for metal additive manufacturing but this project focuses its case study
on the laser based powder bed fusion process. In order to find the geometrical
deviation and variation for the small features, artifact models were designed, printed
and analyzed. Ten different prints were done in order to analyse the geometrical
deviation of the features different process parameters. A measurement strategy is
introduced in the thesis to standardize measurement procedure to reduce the errors.
A comparison between the different measuring techniques with their advantages and
disadvantages are mentioned for the case study. Finally, a comparison between the
parts printed using LB-PBF and Binder Jetting was done. All the results provided
are subject to the scope of the project and provides a learning outcome to carry out
the future research. The results indicate that the orientation of the features with
respect to the recoater and the setting of amount of gas flow and its direction has an
effect on the accuracy of the parts. From the analysis, the least deviation is achieved
using 65% gas flow in relation to standard settings for most of the features. These
results can be verified and concluded only with the further investigations. There is
a high possibility for the bending of arrows of the waveguide in the first and the
last positions when additive manufactured. The selection of measurement technique
and strategies based on the feature size and shape is important and the human error
during measurements is dependent on the magnification of the measuring instrument
and has to be selected wisely. A human error of 3 to 5 μm during measurements
was seen in this thesis project. From the electrical evaluation of waveguide, it was
seen that there is a repeatability and geometrical accuracy for the prints 3, 4 and 5.
Beskrivning
Ämne/nyckelord
Accuracy , Additive manufacturing , Artifact , Binder Jetting , Deviation , Dimensions , Geometrical Accuracy , Measurements , Strategy , Variation , LB-PBF