CORDIS fornisce collegamenti ai risultati finali pubblici e alle pubblicazioni dei progetti ORIZZONTE.
I link ai risultati e alle pubblicazioni dei progetti del 7° PQ, così come i link ad alcuni tipi di risultati specifici come dataset e software, sono recuperati dinamicamente da .OpenAIRE .
Risultati finali
The objective was to find an economic way to improve the surface quality of the lasersintered parts. Different post-processing methods are possible, for e.g. micro-blasting, grinding, polishing, ECM, Laser polishing or vibrator finishing. The commercial used process for SLS-parts is the micro blasting and the polishing. Micro blasting is a very cost efficient and simple process but it is not suitable for high gloss polishing. With polishing the best results will be achieved but a very long processing time is needed.
Within this project a new process was adapted for the use in post-processing of lasersintered surfaces. This process is called vacuum blasting. This process is new on the market and it is very similar to the conventional micro blasting. The difference is an additional cleaning process of the blasting material. Investigations were done with very good results.
The surface quality could be improved from Rz = 40-60µm to Rz = 21µm.
For manufacturing of combinated lasersintering and milling parts it is necessary to use a method which allows an exact positioning of the parts in the building room of the lasersintering machine and on the working plane of the milling system. The positioning must be done with zero tolerance. Another very important objective is the time needed for the placement and fixing of the parts on the building platform respectively on the working plane.
Within this project such a positioning and fixing system was developed. The system is very simple in use and fulfils the above mentioned demands. The application of this positioning and fixing system is not limited for the use in lasersintering process. This method can also be applied in other technical systems were an exact positioning of the parts between two different manufacturing steps is necessary. One example is the manufacturing of EDM electrodes.
The objective was to find different and typical tooling steels like special carburised steel, mild steel, corrosion resistant steel, hot forming tool steel, case hardened steel or pre-alloyed tool steel for the application in the laser sintering Rapid-Prototyping process. These materials should be useful as standard elements.
Currently, there is only one material available on the market for this application. It is the original EOS steel plates.
Several investigations were done with different kind of steels. The material investigation was done in the fields of building test structures, measurement of mechanical strength, scanning electron- and light-microscopy of the contact zones.
At the end, several new materials were investigated for the application as standard elements in the lasers interring Rapid-Prototyping process. Following economic reasons the possibilities for alternative materials are given by these results.
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