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Granulation of extruded plastic wires: Influence of tool coating properties and tool geometry on cutting forces and tool wear

: Cardone, Macario; Putz, Matthias; Schmidt, Gerhard; Dix, Martin; Friedrich, Jürgen; Stockmann, Erich


Wulfsberg, J.P. ; Wissenschaftliche Gesellschaft für Produktionstechnik -WGP-:
WGP Congress 2016. Progress in Production Engineering : Selected, peer reviewed papers from the 2016 WGP Congress, September 5-6, 2016, Hamburg, Germany
Dürnten: Trans Tech Publications, 2016 (Advanced materials research 1140)
ISBN: 978-3-03835-642-4 (Print)
ISBN: 978-3-03859-438-3 (CD-ROM)
ISBN: 978-3-0357-0123-4 (eBook)
Wissenschaftliche Gesellschaft für Produktionstechnik (WGP Congress) <6, 2016, Hamburg>
Fraunhofer IWU ()
finite element method; granulation; physical vapour deposition; PVD; FEM

Granulators are widely used to reduce reinforced and unreinforced plastic strands in small pieces. The tools implemented in this machining process are mainly made of high-speed steel. This work investigates diverse PVD hard thin coatings with the aim of improving tool life and efficiency in granulation technology. A test facility reproducing the main features of a real granulator has been designed and assembled. The machined strand materials are ABS plastic and fibreglass-reinforced polyamide 6, while the tested PVD films are CrN, TiCN, TiAlN and two different diamond-like carbon coatings. The wear evaluation of all coated tools has been done via structured light projection, together with a scanning electron microscopy-based analysis, before and after their implementation on the test facility. Furthermore, a suitable 2D finite element modelling of the machining process has been realized.