Abstract
During polymer extrusion there are a variety of situations in which the screwthread of the extrusion screw has an unlubricated metal-to-metal contact with the barrel wall. At the same time the screw coating is subjected to the highest loads. The combination of a secondary hardening cold work steel 1.2379 and a chromium nitride coating deposited by ARC-PVD, which is frequently used in polymer processing, is characterized and investigated. The characterization is done by metallographic examination, SEM and CLSM. The tests were performed on a pin-on-disk and a pin-roll test rig. Different roughness levels were tested on the pin-on-disk test, where massive differences in wear behavior were found. A hybrid surface structure is proposed to optimize the tribosystem. On the pin-on-disk test stand, rollers made of the same material pairing were tested. The test speed was varied to highlight differences and similarities between the tribological systems. A wear minimization of 50 % was achieved and the similarities between the tribological systems were highlighted. In addition, the investigations led to the development of a new model thesis which provides a reason for the development of stippling on the screw when processing polycarbonate.
About the authors
Torben Buttler, M.Sc., studied Mechanical Engineering at the Clausthal University of Technology, Germany. Since 2019, he has been working as Research Assistant at the Institute of Welding and Machining in the group “Wear”, Clausthal University of Technology, Germany.
Dr.-Ing. Jens Hamje studied Mechanical Engineering at the Leibniz University Hannover, Germany. He completed his Doctor’s degree in 2013.He has been working as a project developer in the research field “Novel materials and processes for competitive products” at the Institute of Welding and Machining, Clausthal University of Technology, Germany.
Dr.-Ing. Rolf Reiter studied Mechanical Engineering at the Clausthal University of Technology, Germany. He completed his Doctor’s degree in 1990. He has been working as Chief Engineer and Leader of the group “Wear” at the Institute of Welding and Machining, Clausthal University of Technology, Germany.
Prof. Dr.-Ing. Volker Wesling studied Mechanical Engineering at the Clausthal University of Technology, Germany, from 1984 to 1989. He completed his Doctor’s degree in 1993. He worked for the Burgsmuller Gmbh and the Berstorff GmbH from 1994 to 2002 and then became Head of the Institute of Welding and Machining at the Clausthal University of Technology, Germany. His research fields are the production of coatings for wear and corrosion protection, low-heat joining and welding processes, abrasive manufacturing processes and material-oriented manufacturing technology.
Acknowledgement
This work was carried out by the Association of Industrial Research Associations “Otto von Guericke” e.V. (AiF) within the scope of the project “Belagbildung unter Betriebsbeanspruchung” (20333 N/3). Furthermore Dr. Wegewitz and Dr. Gustus (IEPT – Institute of Energy Research and Physical Technologies – TU Clausthal) are thanked for the production of the SEM images.
Nomenclature
- CLSM
confocal laser scanning microscopy
- FIB
focused ion beam
- SiO2
silicon dioxide
- CrN
chromium nitride
- PC
polycarbonate
- Ra
arithmetic average roughness
- Rz
averaged roughness depth
- „xxx“
grinding papers grit size
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