Tribological study and coatings impact on release forces during injection moulding

Nielsen, Lars Pleth (Tribology Centre, Danish Technological Institute, Denmark) ; Zabala, Borja (IK4-TEKNIKER, Spain) ; Almtoft, Klaus Pagh (Tribology Centre, Danish Technological Institute, Denmark) ; Christensen, Bjarke Holl (Tribology Centre, Danish Technological Institute, Denmark) ; Rytter, Mads (Winther Mould Technology, Denmark) ; Hengsberger, Stefan (School of Engineering and Architecture (HEIA-FR), HES-SO // University of Applied Sciences Western Switzerland)

In the present study we compare in situ measured demoulding forces with model tests based on reciprocating pin-on-disc configuration at high temperature simulating the mould/thermoplastic interphase. The ejection force and pin-on-disc friction properties were measured for four industrially relevant polymer types (PP, POM, ABS and TPU). The impact on the ejection force was quantified when adding different surface pretreatments (as machined, grinded, blasted, polished and laser textured) to the involved pin-on-disc surfaces and the injection moulding cores. Different PVD coatings (CrN, CrN-HiPIMS and DLC) combined with post treatment involving high-current implantation of nitrogen were investigated. The results revealed that the ejection force could be lowered by up to 70% for some of the thermoplastic types when applying a combination of a wear-resistant coating and nitrogen ion implantation.


Keywords:
Conference Type:
short paper
Faculty:
Ingénierie et Architecture
School:
HEIA-FR
Institute:
IRAP - Institut de recherche appliquée en plasturgie
Subject(s):
Ingénierie
Publisher:
Uppsala, Sweden, 18-21 June 2018
Date:
2018-06
Uppsala, Sweden
18-21 June 2018
Pagination:
2 p.
Published in:
Proceedings of the 18th Nordic Symposium on Tribology (NORDTRIB) 2018, 18-21 june, Uppsala University, Uppsala, Sweden
Numeration (vol. no.):
2018, 18
External resources:
Appears in Collection:



 Record created 2018-09-11, last modified 2018-12-20

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