pps proceeding - Abstract Preview
pps proceeding
Symposium: S11 - Additive Manufacturing
Oral Presentation
 
 

Potential of five-axis kinematic systems for Additive Manufacturing using Fused Deposition Modelling (FDM)

Voll Joshua (1)*, Baier Jonathan (1), Brunotte Rene (2), Roth Stefan (1)

(1) Hochschule Schmalkalden - Thüringen - Germany, (2) bbw Hochschule - berlin - Germany

FDM technology is widely used in additive manufacturing. A plastic filament is fed to a nozzle (hotend), melted and deposited layer wise in the X-, Y-direction according to the imported data of geometry. The print bed moves layer by layer in Z direction restarting the deposition process until the component is built up completely. In a recently developed system by the authors, the degrees of freedom in movement of the print head is extended to five axes: X-, Y-, Z-movement in translational direction plus an additional degree of rotation of the print bed and the possibility to tilt the print head with respect to the printed surface. This paper investigates the potential of additional motion axes with respect to part quality. To determine accuracy, surface quality, processing time and the ability to print overhangs, tests have been carried out and compared to conventional manufactured FDM parts (X-, Y-, Z-kinematics). In a further step, printing of the components after model preparation in polar coordinates is compared to printing in Cartesian coordinates. To investigate the influence of the hotend adjustment on part quality, namely surface roughness, test runs were performed with hotends adjusted at different angles to the surface. Suitable demonstrators were developed for this purpose and evaluated in comparison with manufactured FDM parts from commercially available printers. The results yield the potential for the additional kinematic axes. The system investigated is comparable in performance to a commercially available FDM printers. The possibility of tilting the print head is the most advantage of the system. This has improved part quality significantly especially in printing overhangs and angled surfaces. The comparison between printing in polar and cartesian coordinates showed an improvement in surface quality for cylindrical parts printed by polar coordinates. However machine control algorithms for printing in polar coordinates give way for improvement.